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.\" ========================================================================
.\"
.IX Title "Media::Convert::Asset::Concat 3pm"
.TH Media::Convert::Asset::Concat 3pm "2023-03-07" "perl v5.36.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
Media::Convert::Asset::Concat \- a Media::Convert::Asset made up of multiple assets
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 3
\&  use Media::Convert::Asset;
\&  use Media::Convert::Asset::Concat;
\&  use Media::Convert::Pipe;
\&
\&  my $file1 = Media::Convert::Asset\->new(url => $input_file_1);
\&  my $file2 = Media::Convert::Asset\->new(url => $input_file_2);
\&  my $input = Media::Convert::Asset::Concat\->new(url => "/tmp/concat.txt", components => [$file1, $file2]);
\&  my $output = Media::Convert::Asset\->new(url => $output_file);
\&
\&  Media::Convert::Pipe\->new(inputs => [$input], output => $output, vcopy => 1, acopy => 1)\->run();
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \f(CW\*(C`ffmpeg\*(C'\fR command has a \*(L"concat\*(R" file format, selected with
\&\f(CW\*(C`\-f concat\*(C'\fR, which is essentially a text file containing a header,
followed by a number of URLs to other files.
.PP
When \f(CW\*(C`ffmpeg\*(C'\fR is asked to read from such a file, it will start reading
from the first file, and then move on to the next file when the data
from the first file is complete.
.PP
In order for this to work well, note that \fIall files must be the same
format\fR, to beyond the level that \f(CW\*(C`Media::Convert::Asset\*(C'\fR can detect.
It is probably not safe to use \f(CW\*(C`Media::Convert::Asset::Concat\*(C'\fR except
on files that were created from the same recording.
.PP
Since the files \fIshould\fR be the same, \f(CW\*(C`Media::Convert::Asset::Concat\*(C'\fR
assumes that they are, and will run \f(CW\*(C`ffprobe\*(C'\fR on only the first of its
components when requested.
.SH "ATTRIBUTES"
.IX Header "ATTRIBUTES"
\&\f(CW\*(C`Media::Convert::Asset::Concat\*(C'\fR supports all attributes supported by
Media::Convert::Asset plus the following:
.SS "components"
.IX Subsection "components"
Should be an array of Media::Convert::Asset objects making up the
contents of this asset.
.PP
To add more components, the \f(CW\*(C`add_component\*(C'\fR handle exists.