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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" ffmpeg\-protocols \- FFmpeg protocols .SH "DESCRIPTION" .IX Header "DESCRIPTION" This document describes the input and output protocols provided by the libavformat library. .SH "PROTOCOL OPTIONS" .IX Header "PROTOCOL OPTIONS" The libavformat library provides some generic global options, which can be set on all the protocols. In addition each protocol may support so-called private options, which are specific for that component. .PP The list of supported options follows: .IP "\fBprotocol_whitelist\fR \fIlist\fR \fB(\fR\fIinput\fR\fB)\fR" 4 .IX Item "protocol_whitelist list (input)" Set a \*(L",\*(R"\-separated list of allowed protocols. \*(L"\s-1ALL\*(R"\s0 matches all protocols. Protocols prefixed by \*(L"\-\*(R" are disabled. All protocols are allowed by default but protocols used by an another protocol (nested protocols) are restricted to a per protocol subset. .SH "PROTOCOLS" .IX Header "PROTOCOLS" Protocols are configured elements in FFmpeg that enable access to resources that require specific protocols. .PP When you configure your FFmpeg build, all the supported protocols are enabled by default. You can list all available ones using the configure option \*(L"\-\-list\-protocols\*(R". .PP You can disable all the protocols using the configure option \&\*(L"\-\-disable\-protocols\*(R", and selectively enable a protocol using the option "\-\-enable\-protocol=\fI\s-1PROTOCOL\s0\fR\*(L", or you can disable a particular protocol using the option \&\*(R"\-\-disable\-protocol=\fI\s-1PROTOCOL\s0\fR". .PP The option \*(L"\-protocols\*(R" of the ff* tools will display the list of supported protocols. .PP All protocols accept the following options: .IP "\fBrw_timeout\fR" 4 .IX Item "rw_timeout" Maximum time to wait for (network) read/write operations to complete, in microseconds. .PP A description of the currently available protocols follows. .SS "async" .IX Subsection "async" Asynchronous data filling wrapper for input stream. .PP Fill data in a background thread, to decouple I/O operation from demux thread. .PP .Vb 3 \& async: \& async:http://host/resource \& async:cache:http://host/resource .Ve .SS "bluray" .IX Subsection "bluray" Read BluRay playlist. .PP The accepted options are: .IP "\fBangle\fR" 4 .IX Item "angle" BluRay angle .IP "\fBchapter\fR" 4 .IX Item "chapter" Start chapter (1...N) .IP "\fBplaylist\fR" 4 .IX Item "playlist" Playlist to read (\s-1BDMV/PLAYLIST/\s0?????.mpls) .PP Examples: .PP Read longest playlist from BluRay mounted to /mnt/bluray: .PP .Vb 1 \& bluray:/mnt/bluray .Ve .PP Read angle 2 of playlist 4 from BluRay mounted to /mnt/bluray, start from chapter 2: .PP .Vb 1 \& \-playlist 4 \-angle 2 \-chapter 2 bluray:/mnt/bluray .Ve .SS "cache" .IX Subsection "cache" Caching wrapper for input stream. .PP Cache the input stream to temporary file. It brings seeking capability to live streams. .PP .Vb 1 \& cache: .Ve .SS "concat" .IX Subsection "concat" Physical concatenation protocol. .PP Read and seek from many resources in sequence as if they were a unique resource. .PP A \s-1URL\s0 accepted by this protocol has the syntax: .PP .Vb 1 \& concat:||...| .Ve .PP where \fI\s-1URL1\s0\fR, \fI\s-1URL2\s0\fR, ..., \fI\s-1URLN\s0\fR are the urls of the resource to be concatenated, each one possibly specifying a distinct protocol. .PP For example to read a sequence of files \fIsplit1.mpeg\fR, \&\fIsplit2.mpeg\fR, \fIsplit3.mpeg\fR with \fBffplay\fR use the command: .PP .Vb 1 \& ffplay concat:split1.mpeg\e|split2.mpeg\e|split3.mpeg .Ve .PP Note that you may need to escape the character \*(L"|\*(R" which is special for many shells. .SS "crypto" .IX Subsection "crypto" AES-encrypted stream reading protocol. .PP The accepted options are: .IP "\fBkey\fR" 4 .IX Item "key" Set the \s-1AES\s0 decryption key binary block from given hexadecimal representation. .IP "\fBiv\fR" 4 .IX Item "iv" Set the \s-1AES\s0 decryption initialization vector binary block from given hexadecimal representation. .PP Accepted \s-1URL\s0 formats: .PP .Vb 2 \& crypto: \& crypto+ .Ve .SS "data" .IX Subsection "data" Data in-line in the \s-1URI.\s0 See <\fBhttp://en.wikipedia.org/wiki/Data_URI_scheme\fR>. .PP For example, to convert a \s-1GIF\s0 file given inline with \fBffmpeg\fR: .PP .Vb 1 \& ffmpeg \-i "data:image/gif;base64,R0lGODdhCAAIAMIEAAAAAAAA//8AAP//AP///////////////ywAAAAACAAIAAADF0gEDLojDgdGiJdJqUX02iB4E8Q9jUMkADs=" smiley.png .Ve .SS "file" .IX Subsection "file" File access protocol. .PP Read from or write to a file. .PP A file \s-1URL\s0 can have the form: .PP .Vb 1 \& file: .Ve .PP where \fIfilename\fR is the path of the file to read. .PP An \s-1URL\s0 that does not have a protocol prefix will be assumed to be a file \s-1URL.\s0 Depending on the build, an \s-1URL\s0 that looks like a Windows path with the drive letter at the beginning will also be assumed to be a file \s-1URL \s0(usually not the case in builds for unix-like systems). .PP For example to read from a file \fIinput.mpeg\fR with \fBffmpeg\fR use the command: .PP .Vb 1 \& ffmpeg \-i file:input.mpeg output.mpeg .Ve .PP This protocol accepts the following options: .IP "\fBtruncate\fR" 4 .IX Item "truncate" Truncate existing files on write, if set to 1. A value of 0 prevents truncating. Default value is 1. .IP "\fBblocksize\fR" 4 .IX Item "blocksize" Set I/O operation maximum block size, in bytes. Default value is \&\f(CW\*(C`INT_MAX\*(C'\fR, which results in not limiting the requested block size. Setting this value reasonably low improves user termination request reaction time, which is valuable for files on slow medium. .SS "ftp" .IX Subsection "ftp" \&\s-1FTP \s0(File Transfer Protocol). .PP Read from or write to remote resources using \s-1FTP\s0 protocol. .PP Following syntax is required. .PP .Vb 1 \& ftp://[user[:password]@]server[:port]/path/to/remote/resource.mpeg .Ve .PP This protocol accepts the following options. .IP "\fBtimeout\fR" 4 .IX Item "timeout" Set timeout in microseconds of socket I/O operations used by the underlying low level operation. By default it is set to \-1, which means that the timeout is not specified. .IP "\fBftp-anonymous-password\fR" 4 .IX Item "ftp-anonymous-password" Password used when login as anonymous user. Typically an e\-mail address should be used. .IP "\fBftp-write-seekable\fR" 4 .IX Item "ftp-write-seekable" Control seekability of connection during encoding. If set to 1 the resource is supposed to be seekable, if set to 0 it is assumed not to be seekable. Default value is 0. .PP \&\s-1NOTE:\s0 Protocol can be used as output, but it is recommended to not do it, unless special care is taken (tests, customized server configuration etc.). Different \s-1FTP\s0 servers behave in different way during seek operation. ff* tools may produce incomplete content due to server limitations. .PP This protocol accepts the following options: .IP "\fBfollow\fR" 4 .IX Item "follow" If set to 1, the protocol will retry reading at the end of the file, allowing reading files that still are being written. In order for this to terminate, you either need to use the rw_timeout option, or use the interrupt callback (for \s-1API\s0 users). .SS "gopher" .IX Subsection "gopher" Gopher protocol. .SS "hls" .IX Subsection "hls" Read Apple \s-1HTTP\s0 Live Streaming compliant segmented stream as a uniform one. The M3U8 playlists describing the segments can be remote \s-1HTTP\s0 resources or local files, accessed using the standard file protocol. The nested protocol is declared by specifying "+\fIproto\fR" after the hls \s-1URI\s0 scheme name, where \fIproto\fR is either \*(L"file\*(R" or \*(L"http\*(R". .PP .Vb 2 \& hls+http://host/path/to/remote/resource.m3u8 \& hls+file://path/to/local/resource.m3u8 .Ve .PP Using this protocol is discouraged \- the hls demuxer should work just as well (if not, please report the issues) and is more complete. To use the hls demuxer instead, simply use the direct URLs to the m3u8 files. .SS "http" .IX Subsection "http" \&\s-1HTTP \s0(Hyper Text Transfer Protocol). .PP This protocol accepts the following options: .IP "\fBseekable\fR" 4 .IX Item "seekable" Control seekability of connection. If set to 1 the resource is supposed to be seekable, if set to 0 it is assumed not to be seekable, if set to \-1 it will try to autodetect if it is seekable. Default value is \-1. .IP "\fBchunked_post\fR" 4 .IX Item "chunked_post" If set to 1 use chunked Transfer-Encoding for posts, default is 1. .IP "\fBcontent_type\fR" 4 .IX Item "content_type" Set a specific content type for the \s-1POST\s0 messages or for listen mode. .IP "\fBhttp_proxy\fR" 4 .IX Item "http_proxy" set \s-1HTTP\s0 proxy to tunnel through e.g. http://example.com:1234 .IP "\fBheaders\fR" 4 .IX Item "headers" Set custom \s-1HTTP\s0 headers, can override built in default headers. The value must be a string encoding the headers. .IP "\fBmultiple_requests\fR" 4 .IX Item "multiple_requests" Use persistent connections if set to 1, default is 0. .IP "\fBpost_data\fR" 4 .IX Item "post_data" Set custom \s-1HTTP\s0 post data. .IP "\fBuser_agent\fR" 4 .IX Item "user_agent" Override the User-Agent header. If not specified the protocol will use a string describing the libavformat build. (\*(L"Lavf/\*(R") .IP "\fBuser-agent\fR" 4 .IX Item "user-agent" This is a deprecated option, you can use user_agent instead it. .IP "\fBtimeout\fR" 4 .IX Item "timeout" Set timeout in microseconds of socket I/O operations used by the underlying low level operation. By default it is set to \-1, which means that the timeout is not specified. .IP "\fBreconnect_at_eof\fR" 4 .IX Item "reconnect_at_eof" If set then eof is treated like an error and causes reconnection, this is useful for live / endless streams. .IP "\fBreconnect_streamed\fR" 4 .IX Item "reconnect_streamed" If set then even streamed/non seekable streams will be reconnected on errors. .IP "\fBreconnect_delay_max\fR" 4 .IX Item "reconnect_delay_max" Sets the maximum delay in seconds after which to give up reconnecting .IP "\fBmime_type\fR" 4 .IX Item "mime_type" Export the \s-1MIME\s0 type. .IP "\fBicy\fR" 4 .IX Item "icy" If set to 1 request \s-1ICY \s0(SHOUTcast) metadata from the server. If the server supports this, the metadata has to be retrieved by the application by reading the \fBicy_metadata_headers\fR and \fBicy_metadata_packet\fR options. The default is 1. .IP "\fBicy_metadata_headers\fR" 4 .IX Item "icy_metadata_headers" If the server supports \s-1ICY\s0 metadata, this contains the ICY-specific \s-1HTTP\s0 reply headers, separated by newline characters. .IP "\fBicy_metadata_packet\fR" 4 .IX Item "icy_metadata_packet" If the server supports \s-1ICY\s0 metadata, and \fBicy\fR was set to 1, this contains the last non-empty metadata packet sent by the server. It should be polled in regular intervals by applications interested in mid-stream metadata updates. .IP "\fBcookies\fR" 4 .IX Item "cookies" Set the cookies to be sent in future requests. The format of each cookie is the same as the value of a Set-Cookie \s-1HTTP\s0 response field. Multiple cookies can be delimited by a newline character. .IP "\fBoffset\fR" 4 .IX Item "offset" Set initial byte offset. .IP "\fBend_offset\fR" 4 .IX Item "end_offset" Try to limit the request to bytes preceding this offset. .IP "\fBmethod\fR" 4 .IX Item "method" When used as a client option it sets the \s-1HTTP\s0 method for the request. .Sp When used as a server option it sets the \s-1HTTP\s0 method that is going to be expected from the client(s). If the expected and the received \s-1HTTP\s0 method do not match the client will be given a Bad Request response. When unset the \s-1HTTP\s0 method is not checked for now. This will be replaced by autodetection in the future. .IP "\fBlisten\fR" 4 .IX Item "listen" If set to 1 enables experimental \s-1HTTP\s0 server. This can be used to send data when used as an output option, or read data from a client with \s-1HTTP POST\s0 when used as an input option. If set to 2 enables experimental multi-client \s-1HTTP\s0 server. This is not yet implemented in ffmpeg.c or ffserver.c and thus must not be used as a command line option. .Sp .Vb 2 \& # Server side (sending): \& ffmpeg \-i somefile.ogg \-c copy \-listen 1 \-f ogg http://: \& \& # Client side (receiving): \& ffmpeg \-i http://: \-c copy somefile.ogg \& \& # Client can also be done with wget: \& wget http://: \-O somefile.ogg \& \& # Server side (receiving): \& ffmpeg \-listen 1 \-i http://: \-c copy somefile.ogg \& \& # Client side (sending): \& ffmpeg \-i somefile.ogg \-chunked_post 0 \-c copy \-f ogg http://: \& \& # Client can also be done with wget: \& wget \-\-post\-file=somefile.ogg http://: .Ve .PP \fI\s-1HTTP\s0 Cookies\fR .IX Subsection "HTTP Cookies" .PP Some \s-1HTTP\s0 requests will be denied unless cookie values are passed in with the request. The \fBcookies\fR option allows these cookies to be specified. At the very least, each cookie must specify a value along with a path and domain. \&\s-1HTTP\s0 requests that match both the domain and path will automatically include the cookie value in the \s-1HTTP\s0 Cookie header field. Multiple cookies can be delimited by a newline. .PP The required syntax to play a stream specifying a cookie is: .PP .Vb 1 \& ffplay \-cookies "nlqptid=nltid=tsn; path=/; domain=somedomain.com;" http://somedomain.com/somestream.m3u8 .Ve .SS "Icecast" .IX Subsection "Icecast" Icecast protocol (stream to Icecast servers) .PP This protocol accepts the following options: .IP "\fBice_genre\fR" 4 .IX Item "ice_genre" Set the stream genre. .IP "\fBice_name\fR" 4 .IX Item "ice_name" Set the stream name. .IP "\fBice_description\fR" 4 .IX Item "ice_description" Set the stream description. .IP "\fBice_url\fR" 4 .IX Item "ice_url" Set the stream website \s-1URL.\s0 .IP "\fBice_public\fR" 4 .IX Item "ice_public" Set if the stream should be public. The default is 0 (not public). .IP "\fBuser_agent\fR" 4 .IX Item "user_agent" Override the User-Agent header. If not specified a string of the form \&\*(L"Lavf/\*(R" will be used. .IP "\fBpassword\fR" 4 .IX Item "password" Set the Icecast mountpoint password. .IP "\fBcontent_type\fR" 4 .IX Item "content_type" Set the stream content type. This must be set if it is different from audio/mpeg. .IP "\fBlegacy_icecast\fR" 4 .IX Item "legacy_icecast" This enables support for Icecast versions < 2.4.0, that do not support the \&\s-1HTTP PUT\s0 method but the \s-1SOURCE\s0 method. .PP .Vb 1 \& icecast://[[:]@]:/ .Ve .SS "mmst" .IX Subsection "mmst" \&\s-1MMS \s0(Microsoft Media Server) protocol over \s-1TCP.\s0 .SS "mmsh" .IX Subsection "mmsh" \&\s-1MMS \s0(Microsoft Media Server) protocol over \s-1HTTP.\s0 .PP The required syntax is: .PP .Vb 1 \& mmsh://[:][/][/] .Ve .SS "md5" .IX Subsection "md5" \&\s-1MD5\s0 output protocol. .PP Computes the \s-1MD5\s0 hash of the data to be written, and on close writes this to the designated output or stdout if none is specified. It can be used to test muxers without writing an actual file. .PP Some examples follow. .PP .Vb 2 \& # Write the MD5 hash of the encoded AVI file to the file output.avi.md5. \& ffmpeg \-i input.flv \-f avi \-y md5:output.avi.md5 \& \& # Write the MD5 hash of the encoded AVI file to stdout. \& ffmpeg \-i input.flv \-f avi \-y md5: .Ve .PP Note that some formats (typically \s-1MOV\s0) require the output protocol to be seekable, so they will fail with the \s-1MD5\s0 output protocol. .SS "pipe" .IX Subsection "pipe" \&\s-1UNIX\s0 pipe access protocol. .PP Read and write from \s-1UNIX\s0 pipes. .PP The accepted syntax is: .PP .Vb 1 \& pipe:[] .Ve .PP \&\fInumber\fR is the number corresponding to the file descriptor of the pipe (e.g. 0 for stdin, 1 for stdout, 2 for stderr). If \fInumber\fR is not specified, by default the stdout file descriptor will be used for writing, stdin for reading. .PP For example to read from stdin with \fBffmpeg\fR: .PP .Vb 3 \& cat test.wav | ffmpeg \-i pipe:0 \& # ...this is the same as... \& cat test.wav | ffmpeg \-i pipe: .Ve .PP For writing to stdout with \fBffmpeg\fR: .PP .Vb 3 \& ffmpeg \-i test.wav \-f avi pipe:1 | cat > test.avi \& # ...this is the same as... \& ffmpeg \-i test.wav \-f avi pipe: | cat > test.avi .Ve .PP This protocol accepts the following options: .IP "\fBblocksize\fR" 4 .IX Item "blocksize" Set I/O operation maximum block size, in bytes. Default value is \&\f(CW\*(C`INT_MAX\*(C'\fR, which results in not limiting the requested block size. Setting this value reasonably low improves user termination request reaction time, which is valuable if data transmission is slow. .PP Note that some formats (typically \s-1MOV\s0), require the output protocol to be seekable, so they will fail with the pipe output protocol. .SS "rtmp" .IX Subsection "rtmp" Real-Time Messaging Protocol. .PP The Real-Time Messaging Protocol (\s-1RTMP\s0) is used for streaming multimedia content across a \s-1TCP/IP\s0 network. .PP The required syntax is: .PP .Vb 1 \& rtmp://[:@][:][/][/][/] .Ve .PP The accepted parameters are: .IP "\fBusername\fR" 4 .IX Item "username" An optional username (mostly for publishing). .IP "\fBpassword\fR" 4 .IX Item "password" An optional password (mostly for publishing). .IP "\fBserver\fR" 4 .IX Item "server" The address of the \s-1RTMP\s0 server. .IP "\fBport\fR" 4 .IX Item "port" The number of the \s-1TCP\s0 port to use (by default is 1935). .IP "\fBapp\fR" 4 .IX Item "app" It is the name of the application to access. It usually corresponds to the path where the application is installed on the \s-1RTMP\s0 server (e.g. \fI/ondemand/\fR, \fI/flash/live/\fR, etc.). You can override the value parsed from the \s-1URI\s0 through the \f(CW\*(C`rtmp_app\*(C'\fR option, too. .IP "\fBplaypath\fR" 4 .IX Item "playpath" It is the path or name of the resource to play with reference to the application specified in \fIapp\fR, may be prefixed by \*(L"mp4:\*(R". You can override the value parsed from the \s-1URI\s0 through the \f(CW\*(C`rtmp_playpath\*(C'\fR option, too. .IP "\fBlisten\fR" 4 .IX Item "listen" Act as a server, listening for an incoming connection. .IP "\fBtimeout\fR" 4 .IX Item "timeout" Maximum time to wait for the incoming connection. Implies listen. .PP Additionally, the following parameters can be set via command line options (or in code via \f(CW\*(C`AVOption\*(C'\fRs): .IP "\fBrtmp_app\fR" 4 .IX Item "rtmp_app" Name of application to connect on the \s-1RTMP\s0 server. This option overrides the parameter specified in the \s-1URI.\s0 .IP "\fBrtmp_buffer\fR" 4 .IX Item "rtmp_buffer" Set the client buffer time in milliseconds. The default is 3000. .IP "\fBrtmp_conn\fR" 4 .IX Item "rtmp_conn" Extra arbitrary \s-1AMF\s0 connection parameters, parsed from a string, e.g. like \f(CW\*(C`B:1 S:authMe O:1 NN:code:1.23 NS:flag:ok O:0\*(C'\fR. Each value is prefixed by a single character denoting the type, B for Boolean, N for number, S for string, O for object, or Z for null, followed by a colon. For Booleans the data must be either 0 or 1 for \&\s-1FALSE\s0 or \s-1TRUE,\s0 respectively. Likewise for Objects the data must be 0 or 1 to end or begin an object, respectively. Data items in subobjects may be named, by prefixing the type with 'N' and specifying the name before the value (i.e. \f(CW\*(C`NB:myFlag:1\*(C'\fR). This option may be used multiple times to construct arbitrary \s-1AMF\s0 sequences. .IP "\fBrtmp_flashver\fR" 4 .IX Item "rtmp_flashver" Version of the Flash plugin used to run the \s-1SWF\s0 player. The default is \s-1LNX 9,0,124,2. \s0(When publishing, the default is \s-1FMLE/3.0 \s0(compatible; ).) .IP "\fBrtmp_flush_interval\fR" 4 .IX Item "rtmp_flush_interval" Number of packets flushed in the same request (\s-1RTMPT\s0 only). The default is 10. .IP "\fBrtmp_live\fR" 4 .IX Item "rtmp_live" Specify that the media is a live stream. No resuming or seeking in live streams is possible. The default value is \f(CW\*(C`any\*(C'\fR, which means the subscriber first tries to play the live stream specified in the playpath. If a live stream of that name is not found, it plays the recorded stream. The other possible values are \f(CW\*(C`live\*(C'\fR and \&\f(CW\*(C`recorded\*(C'\fR. .IP "\fBrtmp_pageurl\fR" 4 .IX Item "rtmp_pageurl" \&\s-1URL\s0 of the web page in which the media was embedded. By default no value will be sent. .IP "\fBrtmp_playpath\fR" 4 .IX Item "rtmp_playpath" Stream identifier to play or to publish. This option overrides the parameter specified in the \s-1URI.\s0 .IP "\fBrtmp_subscribe\fR" 4 .IX Item "rtmp_subscribe" Name of live stream to subscribe to. By default no value will be sent. It is only sent if the option is specified or if rtmp_live is set to live. .IP "\fBrtmp_swfhash\fR" 4 .IX Item "rtmp_swfhash" \&\s-1SHA256\s0 hash of the decompressed \s-1SWF\s0 file (32 bytes). .IP "\fBrtmp_swfsize\fR" 4 .IX Item "rtmp_swfsize" Size of the decompressed \s-1SWF\s0 file, required for SWFVerification. .IP "\fBrtmp_swfurl\fR" 4 .IX Item "rtmp_swfurl" \&\s-1URL\s0 of the \s-1SWF\s0 player for the media. By default no value will be sent. .IP "\fBrtmp_swfverify\fR" 4 .IX Item "rtmp_swfverify" \&\s-1URL\s0 to player swf file, compute hash/size automatically. .IP "\fBrtmp_tcurl\fR" 4 .IX Item "rtmp_tcurl" \&\s-1URL\s0 of the target stream. Defaults to proto://host[:port]/app. .PP For example to read with \fBffplay\fR a multimedia resource named \&\*(L"sample\*(R" from the application \*(L"vod\*(R" from an \s-1RTMP\s0 server \*(L"myserver\*(R": .PP .Vb 1 \& ffplay rtmp://myserver/vod/sample .Ve .PP To publish to a password protected server, passing the playpath and app names separately: .PP .Vb 1 \& ffmpeg \-re \-i \-f flv \-rtmp_playpath some/long/path \-rtmp_app long/app/name rtmp://username:password@myserver/ .Ve .SS "rtmpe" .IX Subsection "rtmpe" Encrypted Real-Time Messaging Protocol. .PP The Encrypted Real-Time Messaging Protocol (\s-1RTMPE\s0) is used for streaming multimedia content within standard cryptographic primitives, consisting of Diffie-Hellman key exchange and \s-1HMACSHA256,\s0 generating a pair of \s-1RC4\s0 keys. .SS "rtmps" .IX Subsection "rtmps" Real-Time Messaging Protocol over a secure \s-1SSL\s0 connection. .PP The Real-Time Messaging Protocol (\s-1RTMPS\s0) is used for streaming multimedia content across an encrypted connection. .SS "rtmpt" .IX Subsection "rtmpt" Real-Time Messaging Protocol tunneled through \s-1HTTP.\s0 .PP The Real-Time Messaging Protocol tunneled through \s-1HTTP \s0(\s-1RTMPT\s0) is used for streaming multimedia content within \s-1HTTP\s0 requests to traverse firewalls. .SS "rtmpte" .IX Subsection "rtmpte" Encrypted Real-Time Messaging Protocol tunneled through \s-1HTTP.\s0 .PP The Encrypted Real-Time Messaging Protocol tunneled through \s-1HTTP \s0(\s-1RTMPTE\s0) is used for streaming multimedia content within \s-1HTTP\s0 requests to traverse firewalls. .SS "rtmpts" .IX Subsection "rtmpts" Real-Time Messaging Protocol tunneled through \s-1HTTPS.\s0 .PP The Real-Time Messaging Protocol tunneled through \s-1HTTPS \s0(\s-1RTMPTS\s0) is used for streaming multimedia content within \s-1HTTPS\s0 requests to traverse firewalls. .SS "libsmbclient" .IX Subsection "libsmbclient" libsmbclient permits one to manipulate \s-1CIFS/SMB\s0 network resources. .PP Following syntax is required. .PP .Vb 1 \& smb://[[domain:]user[:password@]]server[/share[/path[/file]]] .Ve .PP This protocol accepts the following options. .IP "\fBtimeout\fR" 4 .IX Item "timeout" Set timeout in milliseconds of socket I/O operations used by the underlying low level operation. By default it is set to \-1, which means that the timeout is not specified. .IP "\fBtruncate\fR" 4 .IX Item "truncate" Truncate existing files on write, if set to 1. A value of 0 prevents truncating. Default value is 1. .IP "\fBworkgroup\fR" 4 .IX Item "workgroup" Set the workgroup used for making connections. By default workgroup is not specified. .PP For more information see: <\fBhttp://www.samba.org/\fR>. .SS "libssh" .IX Subsection "libssh" Secure File Transfer Protocol via libssh .PP Read from or write to remote resources using \s-1SFTP\s0 protocol. .PP Following syntax is required. .PP .Vb 1 \& sftp://[user[:password]@]server[:port]/path/to/remote/resource.mpeg .Ve .PP This protocol accepts the following options. .IP "\fBtimeout\fR" 4 .IX Item "timeout" Set timeout of socket I/O operations used by the underlying low level operation. By default it is set to \-1, which means that the timeout is not specified. .IP "\fBtruncate\fR" 4 .IX Item "truncate" Truncate existing files on write, if set to 1. A value of 0 prevents truncating. Default value is 1. .IP "\fBprivate_key\fR" 4 .IX Item "private_key" Specify the path of the file containing private key to use during authorization. By default libssh searches for keys in the \fI~/.ssh/\fR directory. .PP Example: Play a file stored on remote server. .PP .Vb 1 \& ffplay sftp://user:password@server_address:22/home/user/resource.mpeg .Ve .SS "librtmp rtmp, rtmpe, rtmps, rtmpt, rtmpte" .IX Subsection "librtmp rtmp, rtmpe, rtmps, rtmpt, rtmpte" Real-Time Messaging Protocol and its variants supported through librtmp. .PP Requires the presence of the librtmp headers and library during configuration. You need to explicitly configure the build with \&\*(L"\-\-enable\-librtmp\*(R". If enabled this will replace the native \s-1RTMP\s0 protocol. .PP This protocol provides most client functions and a few server functions needed to support \s-1RTMP, RTMP\s0 tunneled in \s-1HTTP \s0(\s-1RTMPT\s0), encrypted \s-1RTMP \s0(\s-1RTMPE\s0), \s-1RTMP\s0 over \s-1SSL/TLS \s0(\s-1RTMPS\s0) and tunneled variants of these encrypted types (\s-1RTMPTE, RTMPTS\s0). .PP The required syntax is: .PP .Vb 1 \& ://[:][/][/] .Ve .PP where \fIrtmp_proto\fR is one of the strings \*(L"rtmp\*(R", \*(L"rtmpt\*(R", \*(L"rtmpe\*(R", \&\*(L"rtmps\*(R", \*(L"rtmpte\*(R", \*(L"rtmpts\*(R" corresponding to each \s-1RTMP\s0 variant, and \&\fIserver\fR, \fIport\fR, \fIapp\fR and \fIplaypath\fR have the same meaning as specified for the \s-1RTMP\s0 native protocol. \&\fIoptions\fR contains a list of space-separated options of the form \&\fIkey\fR=\fIval\fR. .PP See the librtmp manual page (man 3 librtmp) for more information. .PP For example, to stream a file in real-time to an \s-1RTMP\s0 server using \&\fBffmpeg\fR: .PP .Vb 1 \& ffmpeg \-re \-i myfile \-f flv rtmp://myserver/live/mystream .Ve .PP To play the same stream using \fBffplay\fR: .PP .Vb 1 \& ffplay "rtmp://myserver/live/mystream live=1" .Ve .SS "rtp" .IX Subsection "rtp" Real-time Transport Protocol. .PP The required syntax for an \s-1RTP URL\s0 is: rtp://\fIhostname\fR[:\fIport\fR][?\fIoption\fR=\fIval\fR...] .PP \&\fIport\fR specifies the \s-1RTP\s0 port to use. .PP The following \s-1URL\s0 options are supported: .IP "\fBttl=\fR\fIn\fR" 4 .IX Item "ttl=n" Set the \s-1TTL \s0(Time-To-Live) value (for multicast only). .IP "\fBrtcpport=\fR\fIn\fR" 4 .IX Item "rtcpport=n" Set the remote \s-1RTCP\s0 port to \fIn\fR. .IP "\fBlocalrtpport=\fR\fIn\fR" 4 .IX Item "localrtpport=n" Set the local \s-1RTP\s0 port to \fIn\fR. .IP "\fBlocalrtcpport=\fR\fIn\fR\fB'\fR" 4 .IX Item "localrtcpport=n'" Set the local \s-1RTCP\s0 port to \fIn\fR. .IP "\fBpkt_size=\fR\fIn\fR" 4 .IX Item "pkt_size=n" Set max packet size (in bytes) to \fIn\fR. .IP "\fBconnect=0|1\fR" 4 .IX Item "connect=0|1" Do a \f(CW\*(C`connect()\*(C'\fR on the \s-1UDP\s0 socket (if set to 1) or not (if set to 0). .IP "\fBsources=\fR\fIip\fR\fB[,\fR\fIip\fR\fB]\fR" 4 .IX Item "sources=ip[,ip]" List allowed source \s-1IP\s0 addresses. .IP "\fBblock=\fR\fIip\fR\fB[,\fR\fIip\fR\fB]\fR" 4 .IX Item "block=ip[,ip]" List disallowed (blocked) source \s-1IP\s0 addresses. .IP "\fBwrite_to_source=0|1\fR" 4 .IX Item "write_to_source=0|1" Send packets to the source address of the latest received packet (if set to 1) or to a default remote address (if set to 0). .IP "\fBlocalport=\fR\fIn\fR" 4 .IX Item "localport=n" Set the local \s-1RTP\s0 port to \fIn\fR. .Sp This is a deprecated option. Instead, \fBlocalrtpport\fR should be used. .PP Important notes: .IP "1." 4 If \fBrtcpport\fR is not set the \s-1RTCP\s0 port will be set to the \s-1RTP\s0 port value plus 1. .IP "2." 4 If \fBlocalrtpport\fR (the local \s-1RTP\s0 port) is not set any available port will be used for the local \s-1RTP\s0 and \s-1RTCP\s0 ports. .IP "3." 4 If \fBlocalrtcpport\fR (the local \s-1RTCP\s0 port) is not set it will be set to the local \s-1RTP\s0 port value plus 1. .SS "rtsp" .IX Subsection "rtsp" Real-Time Streaming Protocol. .PP \&\s-1RTSP\s0 is not technically a protocol handler in libavformat, it is a demuxer and muxer. The demuxer supports both normal \s-1RTSP \s0(with data transferred over \s-1RTP\s0; this is used by e.g. Apple and Microsoft) and Real-RTSP (with data transferred over \s-1RDT\s0). .PP The muxer can be used to send a stream using \s-1RTSP ANNOUNCE\s0 to a server supporting it (currently Darwin Streaming Server and Mischa Spiegelmock's <\fBhttps://github.com/revmischa/rtsp\-server\fR>). .PP The required syntax for a \s-1RTSP\s0 url is: .PP .Vb 1 \& rtsp://[:]/ .Ve .PP Options can be set on the \fBffmpeg\fR/\fBffplay\fR command line, or set in code via \f(CW\*(C`AVOption\*(C'\fRs or in \&\f(CW\*(C`avformat_open_input\*(C'\fR. .PP The following options are supported. .IP "\fBinitial_pause\fR" 4 .IX Item "initial_pause" Do not start playing the stream immediately if set to 1. Default value is 0. .IP "\fBrtsp_transport\fR" 4 .IX Item "rtsp_transport" Set \s-1RTSP\s0 transport protocols. .Sp It accepts the following values: .RS 4 .IP "\fBudp\fR" 4 .IX Item "udp" Use \s-1UDP\s0 as lower transport protocol. .IP "\fBtcp\fR" 4 .IX Item "tcp" Use \s-1TCP \s0(interleaving within the \s-1RTSP\s0 control channel) as lower transport protocol. .IP "\fBudp_multicast\fR" 4 .IX Item "udp_multicast" Use \s-1UDP\s0 multicast as lower transport protocol. .IP "\fBhttp\fR" 4 .IX Item "http" Use \s-1HTTP\s0 tunneling as lower transport protocol, which is useful for passing proxies. .RE .RS 4 .Sp Multiple lower transport protocols may be specified, in that case they are tried one at a time (if the setup of one fails, the next one is tried). For the muxer, only the \fBtcp\fR and \fBudp\fR options are supported. .RE .IP "\fBrtsp_flags\fR" 4 .IX Item "rtsp_flags" Set \s-1RTSP\s0 flags. .Sp The following values are accepted: .RS 4 .IP "\fBfilter_src\fR" 4 .IX Item "filter_src" Accept packets only from negotiated peer address and port. .IP "\fBlisten\fR" 4 .IX Item "listen" Act as a server, listening for an incoming connection. .IP "\fBprefer_tcp\fR" 4 .IX Item "prefer_tcp" Try \s-1TCP\s0 for \s-1RTP\s0 transport first, if \s-1TCP\s0 is available as \s-1RTSP RTP\s0 transport. .RE .RS 4 .Sp Default value is \fBnone\fR. .RE .IP "\fBallowed_media_types\fR" 4 .IX Item "allowed_media_types" Set media types to accept from the server. .Sp The following flags are accepted: .RS 4 .IP "\fBvideo\fR" 4 .IX Item "video" .PD 0 .IP "\fBaudio\fR" 4 .IX Item "audio" .IP "\fBdata\fR" 4 .IX Item "data" .RE .RS 4 .PD .Sp By default it accepts all media types. .RE .IP "\fBmin_port\fR" 4 .IX Item "min_port" Set minimum local \s-1UDP\s0 port. Default value is 5000. .IP "\fBmax_port\fR" 4 .IX Item "max_port" Set maximum local \s-1UDP\s0 port. Default value is 65000. .IP "\fBtimeout\fR" 4 .IX Item "timeout" Set maximum timeout (in seconds) to wait for incoming connections. .Sp A value of \-1 means infinite (default). This option implies the \&\fBrtsp_flags\fR set to \fBlisten\fR. .IP "\fBreorder_queue_size\fR" 4 .IX Item "reorder_queue_size" Set number of packets to buffer for handling of reordered packets. .IP "\fBstimeout\fR" 4 .IX Item "stimeout" Set socket \s-1TCP I/O\s0 timeout in microseconds. .IP "\fBuser-agent\fR" 4 .IX Item "user-agent" Override User-Agent header. If not specified, it defaults to the libavformat identifier string. .PP When receiving data over \s-1UDP,\s0 the demuxer tries to reorder received packets (since they may arrive out of order, or packets may get lost totally). This can be disabled by setting the maximum demuxing delay to zero (via the \f(CW\*(C`max_delay\*(C'\fR field of AVFormatContext). .PP When watching multi-bitrate Real-RTSP streams with \fBffplay\fR, the streams to display can be chosen with \f(CW\*(C`\-vst\*(C'\fR \fIn\fR and \&\f(CW\*(C`\-ast\*(C'\fR \fIn\fR for video and audio respectively, and can be switched on the fly by pressing \f(CW\*(C`v\*(C'\fR and \f(CW\*(C`a\*(C'\fR. .PP \fIExamples\fR .IX Subsection "Examples" .PP The following examples all make use of the \fBffplay\fR and \&\fBffmpeg\fR tools. .IP "\(bu" 4 Watch a stream over \s-1UDP,\s0 with a max reordering delay of 0.5 seconds: .Sp .Vb 1 \& ffplay \-max_delay 500000 \-rtsp_transport udp rtsp://server/video.mp4 .Ve .IP "\(bu" 4 Watch a stream tunneled over \s-1HTTP:\s0 .Sp .Vb 1 \& ffplay \-rtsp_transport http rtsp://server/video.mp4 .Ve .IP "\(bu" 4 Send a stream in realtime to a \s-1RTSP\s0 server, for others to watch: .Sp .Vb 1 \& ffmpeg \-re \-i \-f rtsp \-muxdelay 0.1 rtsp://server/live.sdp .Ve .IP "\(bu" 4 Receive a stream in realtime: .Sp .Vb 1 \& ffmpeg \-rtsp_flags listen \-i rtsp://ownaddress/live.sdp .Ve .SS "sap" .IX Subsection "sap" Session Announcement Protocol (\s-1RFC 2974\s0). This is not technically a protocol handler in libavformat, it is a muxer and demuxer. It is used for signalling of \s-1RTP\s0 streams, by announcing the \s-1SDP\s0 for the streams regularly on a separate port. .PP \fIMuxer\fR .IX Subsection "Muxer" .PP The syntax for a \s-1SAP\s0 url given to the muxer is: .PP .Vb 1 \& sap://[:][?] .Ve .PP The \s-1RTP\s0 packets are sent to \fIdestination\fR on port \fIport\fR, or to port 5004 if no port is specified. \&\fIoptions\fR is a \f(CW\*(C`&\*(C'\fR\-separated list. The following options are supported: .IP "\fBannounce_addr=\fR\fIaddress\fR" 4 .IX Item "announce_addr=address" Specify the destination \s-1IP\s0 address for sending the announcements to. If omitted, the announcements are sent to the commonly used \s-1SAP\s0 announcement multicast address 224.2.127.254 (sap.mcast.net), or ff0e::2:7ffe if \fIdestination\fR is an IPv6 address. .IP "\fBannounce_port=\fR\fIport\fR" 4 .IX Item "announce_port=port" Specify the port to send the announcements on, defaults to 9875 if not specified. .IP "\fBttl=\fR\fIttl\fR" 4 .IX Item "ttl=ttl" Specify the time to live value for the announcements and \s-1RTP\s0 packets, defaults to 255. .IP "\fBsame_port=\fR\fI0|1\fR" 4 .IX Item "same_port=0|1" If set to 1, send all \s-1RTP\s0 streams on the same port pair. If zero (the default), all streams are sent on unique ports, with each stream on a port 2 numbers higher than the previous. VLC/Live555 requires this to be set to 1, to be able to receive the stream. The \s-1RTP\s0 stack in libavformat for receiving requires all streams to be sent on unique ports. .PP Example command lines follow. .PP To broadcast a stream on the local subnet, for watching in \s-1VLC:\s0 .PP .Vb 1 \& ffmpeg \-re \-i \-f sap sap://224.0.0.255?same_port=1 .Ve .PP Similarly, for watching in \fBffplay\fR: .PP .Vb 1 \& ffmpeg \-re \-i \-f sap sap://224.0.0.255 .Ve .PP And for watching in \fBffplay\fR, over IPv6: .PP .Vb 1 \& ffmpeg \-re \-i \-f sap sap://[ff0e::1:2:3:4] .Ve .PP \fIDemuxer\fR .IX Subsection "Demuxer" .PP The syntax for a \s-1SAP\s0 url given to the demuxer is: .PP .Vb 1 \& sap://[
][:] .Ve .PP \&\fIaddress\fR is the multicast address to listen for announcements on, if omitted, the default 224.2.127.254 (sap.mcast.net) is used. \fIport\fR is the port that is listened on, 9875 if omitted. .PP The demuxers listens for announcements on the given address and port. Once an announcement is received, it tries to receive that particular stream. .PP Example command lines follow. .PP To play back the first stream announced on the normal \s-1SAP\s0 multicast address: .PP .Vb 1 \& ffplay sap:// .Ve .PP To play back the first stream announced on one the default IPv6 \s-1SAP\s0 multicast address: .PP .Vb 1 \& ffplay sap://[ff0e::2:7ffe] .Ve .SS "sctp" .IX Subsection "sctp" Stream Control Transmission Protocol. .PP The accepted \s-1URL\s0 syntax is: .PP .Vb 1 \& sctp://:[?] .Ve .PP The protocol accepts the following options: .IP "\fBlisten\fR" 4 .IX Item "listen" If set to any value, listen for an incoming connection. Outgoing connection is done by default. .IP "\fBmax_streams\fR" 4 .IX Item "max_streams" Set the maximum number of streams. By default no limit is set. .SS "srtp" .IX Subsection "srtp" Secure Real-time Transport Protocol. .PP The accepted options are: .IP "\fBsrtp_in_suite\fR" 4 .IX Item "srtp_in_suite" .PD 0 .IP "\fBsrtp_out_suite\fR" 4 .IX Item "srtp_out_suite" .PD Select input and output encoding suites. .Sp Supported values: .RS 4 .IP "\fB\s-1AES_CM_128_HMAC_SHA1_80\s0\fR" 4 .IX Item "AES_CM_128_HMAC_SHA1_80" .PD 0 .IP "\fB\s-1SRTP_AES128_CM_HMAC_SHA1_80\s0\fR" 4 .IX Item "SRTP_AES128_CM_HMAC_SHA1_80" .IP "\fB\s-1AES_CM_128_HMAC_SHA1_32\s0\fR" 4 .IX Item "AES_CM_128_HMAC_SHA1_32" .IP "\fB\s-1SRTP_AES128_CM_HMAC_SHA1_32\s0\fR" 4 .IX Item "SRTP_AES128_CM_HMAC_SHA1_32" .RE .RS 4 .RE .IP "\fBsrtp_in_params\fR" 4 .IX Item "srtp_in_params" .IP "\fBsrtp_out_params\fR" 4 .IX Item "srtp_out_params" .PD Set input and output encoding parameters, which are expressed by a base64\-encoded representation of a binary block. The first 16 bytes of this binary block are used as master key, the following 14 bytes are used as master salt. .SS "subfile" .IX Subsection "subfile" Virtually extract a segment of a file or another stream. The underlying stream must be seekable. .PP Accepted options: .IP "\fBstart\fR" 4 .IX Item "start" Start offset of the extracted segment, in bytes. .IP "\fBend\fR" 4 .IX Item "end" End offset of the extracted segment, in bytes. .PP Examples: .PP Extract a chapter from a \s-1DVD VOB\s0 file (start and end sectors obtained externally and multiplied by 2048): .PP .Vb 1 \& subfile,,start,153391104,end,268142592,,:/media/dvd/VIDEO_TS/VTS_08_1.VOB .Ve .PP Play an \s-1AVI\s0 file directly from a \s-1TAR\s0 archive: .PP .Vb 1 \& subfile,,start,183241728,end,366490624,,:archive.tar .Ve .SS "tee" .IX Subsection "tee" Writes the output to multiple protocols. The individual outputs are separated by | .PP .Vb 1 \& tee:file://path/to/local/this.avi|file://path/to/local/that.avi .Ve .SS "tcp" .IX Subsection "tcp" Transmission Control Protocol. .PP The required syntax for a \s-1TCP\s0 url is: .PP .Vb 1 \& tcp://:[?] .Ve .PP \&\fIoptions\fR contains a list of &\-separated options of the form \&\fIkey\fR=\fIval\fR. .PP The list of supported options follows. .IP "\fBlisten=\fR\fI1|0\fR" 4 .IX Item "listen=1|0" Listen for an incoming connection. Default value is 0. .IP "\fBtimeout=\fR\fImicroseconds\fR" 4 .IX Item "timeout=microseconds" Set raise error timeout, expressed in microseconds. .Sp This option is only relevant in read mode: if no data arrived in more than this time interval, raise error. .IP "\fBlisten_timeout=\fR\fImilliseconds\fR" 4 .IX Item "listen_timeout=milliseconds" Set listen timeout, expressed in milliseconds. .IP "\fBrecv_buffer_size=\fR\fIbytes\fR" 4 .IX Item "recv_buffer_size=bytes" Set receive buffer size, expressed bytes. .IP "\fBsend_buffer_size=\fR\fIbytes\fR" 4 .IX Item "send_buffer_size=bytes" Set send buffer size, expressed bytes. .PP The following example shows how to setup a listening \s-1TCP\s0 connection with \fBffmpeg\fR, which is then accessed with \fBffplay\fR: .PP .Vb 2 \& ffmpeg \-i \-f tcp://:?listen \& ffplay tcp://: .Ve .SS "tls" .IX Subsection "tls" Transport Layer Security (\s-1TLS\s0) / Secure Sockets Layer (\s-1SSL\s0) .PP The required syntax for a \s-1TLS/SSL\s0 url is: .PP .Vb 1 \& tls://:[?] .Ve .PP The following parameters can be set via command line options (or in code via \f(CW\*(C`AVOption\*(C'\fRs): .IP "\fBca_file, cafile=\fR\fIfilename\fR" 4 .IX Item "ca_file, cafile=filename" A file containing certificate authority (\s-1CA\s0) root certificates to treat as trusted. If the linked \s-1TLS\s0 library contains a default this might not need to be specified for verification to work, but not all libraries and setups have defaults built in. The file must be in OpenSSL \s-1PEM\s0 format. .IP "\fBtls_verify=\fR\fI1|0\fR" 4 .IX Item "tls_verify=1|0" If enabled, try to verify the peer that we are communicating with. Note, if using OpenSSL, this currently only makes sure that the peer certificate is signed by one of the root certificates in the \s-1CA\s0 database, but it does not validate that the certificate actually matches the host name we are trying to connect to. (With GnuTLS, the host name is validated as well.) .Sp This is disabled by default since it requires a \s-1CA\s0 database to be provided by the caller in many cases. .IP "\fBcert_file, cert=\fR\fIfilename\fR" 4 .IX Item "cert_file, cert=filename" A file containing a certificate to use in the handshake with the peer. (When operating as server, in listen mode, this is more often required by the peer, while client certificates only are mandated in certain setups.) .IP "\fBkey_file, key=\fR\fIfilename\fR" 4 .IX Item "key_file, key=filename" A file containing the private key for the certificate. .IP "\fBlisten=\fR\fI1|0\fR" 4 .IX Item "listen=1|0" If enabled, listen for connections on the provided port, and assume the server role in the handshake instead of the client role. .PP Example command lines: .PP To create a \s-1TLS/SSL\s0 server that serves an input stream. .PP .Vb 1 \& ffmpeg \-i \-f tls://:?listen&cert=&key= .Ve .PP To play back a stream from the \s-1TLS/SSL\s0 server using \fBffplay\fR: .PP .Vb 1 \& ffplay tls://: .Ve .SS "udp" .IX Subsection "udp" User Datagram Protocol. .PP The required syntax for an \s-1UDP URL\s0 is: .PP .Vb 1 \& udp://:[?] .Ve .PP \&\fIoptions\fR contains a list of &\-separated options of the form \fIkey\fR=\fIval\fR. .PP In case threading is enabled on the system, a circular buffer is used to store the incoming data, which allows one to reduce loss of data due to \&\s-1UDP\s0 socket buffer overruns. The \fIfifo_size\fR and \&\fIoverrun_nonfatal\fR options are related to this buffer. .PP The list of supported options follows. .IP "\fBbuffer_size=\fR\fIsize\fR" 4 .IX Item "buffer_size=size" Set the \s-1UDP\s0 maximum socket buffer size in bytes. This is used to set either the receive or send buffer size, depending on what the socket is used for. Default is 64KB. See also \fIfifo_size\fR. .IP "\fBbitrate=\fR\fIbitrate\fR" 4 .IX Item "bitrate=bitrate" If set to nonzero, the output will have the specified constant bitrate if the input has enough packets to sustain it. .IP "\fBburst_bits=\fR\fIbits\fR" 4 .IX Item "burst_bits=bits" When using \fIbitrate\fR this specifies the maximum number of bits in packet bursts. .IP "\fBlocalport=\fR\fIport\fR" 4 .IX Item "localport=port" Override the local \s-1UDP\s0 port to bind with. .IP "\fBlocaladdr=\fR\fIaddr\fR" 4 .IX Item "localaddr=addr" Choose the local \s-1IP\s0 address. This is useful e.g. if sending multicast and the host has multiple interfaces, where the user can choose which interface to send on by specifying the \s-1IP\s0 address of that interface. .IP "\fBpkt_size=\fR\fIsize\fR" 4 .IX Item "pkt_size=size" Set the size in bytes of \s-1UDP\s0 packets. .IP "\fBreuse=\fR\fI1|0\fR" 4 .IX Item "reuse=1|0" Explicitly allow or disallow reusing \s-1UDP\s0 sockets. .IP "\fBttl=\fR\fIttl\fR" 4 .IX Item "ttl=ttl" Set the time to live value (for multicast only). .IP "\fBconnect=\fR\fI1|0\fR" 4 .IX Item "connect=1|0" Initialize the \s-1UDP\s0 socket with \f(CW\*(C`connect()\*(C'\fR. In this case, the destination address can't be changed with ff_udp_set_remote_url later. If the destination address isn't known at the start, this option can be specified in ff_udp_set_remote_url, too. This allows finding out the source address for the packets with getsockname, and makes writes return with \s-1AVERROR\s0(\s-1ECONNREFUSED\s0) if \*(L"destination unreachable\*(R" is received. For receiving, this gives the benefit of only receiving packets from the specified peer address/port. .IP "\fBsources=\fR\fIaddress\fR\fB[,\fR\fIaddress\fR\fB]\fR" 4 .IX Item "sources=address[,address]" Only receive packets sent to the multicast group from one of the specified sender \s-1IP\s0 addresses. .IP "\fBblock=\fR\fIaddress\fR\fB[,\fR\fIaddress\fR\fB]\fR" 4 .IX Item "block=address[,address]" Ignore packets sent to the multicast group from the specified sender \s-1IP\s0 addresses. .IP "\fBfifo_size=\fR\fIunits\fR" 4 .IX Item "fifo_size=units" Set the \s-1UDP\s0 receiving circular buffer size, expressed as a number of packets with size of 188 bytes. If not specified defaults to 7*4096. .IP "\fBoverrun_nonfatal=\fR\fI1|0\fR" 4 .IX Item "overrun_nonfatal=1|0" Survive in case of \s-1UDP\s0 receiving circular buffer overrun. Default value is 0. .IP "\fBtimeout=\fR\fImicroseconds\fR" 4 .IX Item "timeout=microseconds" Set raise error timeout, expressed in microseconds. .Sp This option is only relevant in read mode: if no data arrived in more than this time interval, raise error. .IP "\fBbroadcast=\fR\fI1|0\fR" 4 .IX Item "broadcast=1|0" Explicitly allow or disallow \s-1UDP\s0 broadcasting. .Sp Note that broadcasting may not work properly on networks having a broadcast storm protection. .PP \fIExamples\fR .IX Subsection "Examples" .IP "\(bu" 4 Use \fBffmpeg\fR to stream over \s-1UDP\s0 to a remote endpoint: .Sp .Vb 1 \& ffmpeg \-i \-f udp://: .Ve .IP "\(bu" 4 Use \fBffmpeg\fR to stream in mpegts format over \s-1UDP\s0 using 188 sized \s-1UDP\s0 packets, using a large input buffer: .Sp .Vb 1 \& ffmpeg \-i \-f mpegts udp://:?pkt_size=188&buffer_size=65535 .Ve .IP "\(bu" 4 Use \fBffmpeg\fR to receive over \s-1UDP\s0 from a remote endpoint: .Sp .Vb 1 \& ffmpeg \-i udp://[]: ... .Ve .SS "unix" .IX Subsection "unix" Unix local socket .PP The required syntax for a Unix socket \s-1URL\s0 is: .PP .Vb 1 \& unix:// .Ve .PP The following parameters can be set via command line options (or in code via \f(CW\*(C`AVOption\*(C'\fRs): .IP "\fBtimeout\fR" 4 .IX Item "timeout" Timeout in ms. .IP "\fBlisten\fR" 4 .IX Item "listen" Create the Unix socket in listening mode. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fIffmpeg\fR\|(1), \fIffplay\fR\|(1), \fIffprobe\fR\|(1), \fIffserver\fR\|(1), \fIlibavformat\fR\|(3) .SH "AUTHORS" .IX Header "AUTHORS" The FFmpeg developers. .PP For details about the authorship, see the Git history of the project (git://source.ffmpeg.org/ffmpeg), e.g. by typing the command \&\fBgit log\fR in the FFmpeg source directory, or browsing the online repository at <\fBhttp://source.ffmpeg.org\fR>. .PP Maintainers for the specific components are listed in the file \&\fI\s-1MAINTAINERS\s0\fR in the source code tree.