NAME¶
ogmcat - Concatenate several OGG/OGM files into one big OGG/OGM file
SYNOPSIS¶
ogmcat [
options] -o
outname inname1 [
inname2
[
inname3 ...]]
DESCRIPTION¶
ogmcat does NOT work at the moment. It is work in progress. I included it
just out of laziness (otherwise I'd have to remove it from the
Makefile/configure stuff prior to releasing this version).
ogmcat can be used to concatenate several OGG/OGM files into one big file
if they are of the same type. For a more in-depth description refer to the
LIMITATIONS section.
- -o, --output outname
- Output to 'outname'.
- inname1
- Use 'inname1', 'inname2' etc as the
sources.
- -m, --manualsync n
- Specifies a manual sync value in ms that will be added to
each stream's presentation timestamps along with the value calculated by
the chosen sync algorithm (see the -s option). This option can be
used for each input file although it has no effect if used for the first
one as well.
- -s, --sync nr
- Uses sync mode nr. Valid values are 0 - 4.
The default value is shown on ogmcat's help screen.
- -n, --nosafetychecks
- Disable the safety checks made prior to the concatenating.
The resulting file may be unplayable. See the LIMITATIONS section
for further details.
- -v, --verbose
- Be verbose and show each OGG packet. Can be used twice to
increase verbosity.
- -h, --help
- Show this help.
- -V, --version
- Show version information.
LIMITATIONS¶
Concatenating streams is difficult at the best and might even be impossible.
Therefore
ogmcat makes very strict comparisons between the streams
contained in the input files. The checks done include:
- *
- general: All streams with the same serial number must be of
the same type (video, audio, Vorbis audio or text streams).
- *
- general: If a stream exists in one file it must in
the other files as well.
- *
- video streams: The codec FourCC, width, height and FPS must
match.
- *
- Vorbis streams: The sample rate and the number of channels
must match.
- *
- other audio streams: The codec ID, sample rate, bits per
sample and number of channels must match.
- *
- text/subtitle streams: The 'time unit' must match.
The user can forcefully override the last four checks with the
-n
parameter. The checks marked as 'general' cannot be overridden this way.
Audio/video synchronization might not be ok in the resulting file even if the
source files were perfectly in sync. The user can experiment with the
-s parameter which causes
ogmcat to use slightly different
algorithms for calculating the granulepos values for the audio and text
streams. The range of valid parameters will be printed on
ogmcat's help
screen.
If none of the synchronization algorithms provided works correctly then the user
can also manually add a synchronization offset using the
-m option for
each input file.
AUTHOR¶
ogmcat was written by Moritz Bunkus <moritz@bunkus.org>.
SEE ALSO¶
ogmmerge(1),
ogminfo(1),
ogmdemux(1),
ogmsplit(1),
dvdxchap(1)
WWW¶
The newest version can always be found at
<http://www.bunkus.org/videotools/ogmtools/>