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Merge pull request #52 from edsu/combine-tracks

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combine-tracks
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Ashley 2016-05-06 14:38:18 -04:00
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</div>
<!-- ends Split audio and video tracks -->
<!-- Combine audio tracks -->
<span data-toggle="modal" data-target=".combine_audio"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Combine audio tracks">Combine audio tracks</button></span>
<div class="modal fade combine_audio" tabindex="-1" role="dialog" aria-labelledby="myLargeModalLabel">
<div class="modal-dialog modal-lg">
<div class="modal-content">
<div class="well">
<h3>Combine audio tracks into one in a video file</h3>
<p><code>ffmpeg -i <i>input_file</i> -filter_complex "[0:a:0][0:a:1]amerge[out]" -map 0:v -map "[out]" -c:v copy -shortest <i>output_file</i></code></p>
<p>This command combines two audio tracks present in a video file
into one stream. It can be useful in situations where a downstream
process, like YouTube's automatic captioning, expect one audio
track. To ensure that you’re mapping the right audio tracks run
ffprobe before writing the script to identify which tracks are
desired. More than two audio streams can be combined by extending the
pattern present in the -filter_complex option.</p>
<dl>
<dt>ffmpeg</dt>
<dd>starts the command</dd>
<dt>-i <i>input_file</i></dt>
<dd>path, name and extension of the input file</dd>
<dt>-filter_complex <i>[0:a:0][0:a:1]amerge[out]</i></dt>
<dd>combines the two audio tracks into one</dd>
<dt>-map <i>0:v</i></dt>
<dd>map the video</dd>
<dt>-map <i>"[out]"</i></dt>
<dd>map the combined audio defined by the filter</dd>
<dt>-c:v <i>copy</i></dt>
<dd>copy the video</dd>
<dt>-shortest</dt>
<dd>limit to the shortest stream</dd>
<dt><i>video_output_file</i></dt>
<dd>path, name and extension of the video output file</dd>
</dl>
</div>
</div>
</div>
</div>
<!-- ends Combine audio tracks -->
<!-- Extract audio from an AV file -->
<span data-toggle="modal" data-target=".extract_audio"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Extract audio without loss from an AV file">Extract audio</button></span>
<div class="modal fade extract_audio" tabindex="-1" role="dialog" aria-labelledby="myLargeModalLabel">