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kfrn 2017-05-09 20:46:51 +12:00
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@ -60,10 +60,10 @@
<dt>ffmpeg</dt><dd>starts the command</dd>
<dt>-i <i>input_file</i></dt><dd>path and name of the input file<br>
The extension for the Matroska container is <code>.mkv</code>.</dd>
<dt>-c:v copy</dt><dd>re-encodes using the same video codec</dd>
<dt>-c:a aac</dt><dd>re-encodes using the AAC audio codec<br>
<dt>-c:v copy</dt><dd>copies the video stream without re-encoding it</dd>
<dt>-c:a aac</dt><dd>re-encodes the audio stream using the AAC audio codec<br>
Note that sadly MP4 cannot contain sound encoded by a PCM (Pulse-Code Modulation) audio codec.<br>
For silent videos you can replace <code>-c:a aac</code> by <code>-an</code>.</dd>
For silent videos you can replace <code>-c:a aac</code> by <code>-an</code>, which means that there will be no audio track in the output file.</dd>
<dt><i>output_file</i></dt><dd>path and name of the output file<br>
The extension for the MP4 container is <code>.mp4</code>.</dd>
</dl>
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<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>-c:v libx264</dt><dd>tells ffmpeg to change the video codec of the file to H.264</dd>
<dt>-c:v libx264</dt><dd>tells ffmpeg to encode the video stream as H.264</dd>
<dt>-pix_fmt yuv420p</dt><dd> libx264 will use a chroma subsampling scheme that is the closest match to that of the input. This can result in Y′C<sub>B</sub>C<sub>R</sub> 4:2:0, 4:2:2, or 4:4:4 chroma subsampling. QuickTime and most other non-FFmpeg based players can’t decode H.264 files that are not 4:2:0. In order to allow the video to play in all players, you can specify 4:2:0 chroma subsampling.</dd>
<dt>-c:a copy</dt><dd>tells ffmpeg not to change the audio codec</dd>
<dt>-c:a copy</dt><dd>tells ffmpeg to copy the audio stream without re-encoding it</dd>
<dt><i>output_file</i></dt><dd>path, name and extension of the output file</dd>
</dl>
<p>In order to use the same basic command to make a higher quality file, you can add some of these presets:</p>
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</div>
</div>
<!-- ends abitscope -->
<!-- astats -->
<span data-toggle="modal" data-target="#astats"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Play a graphical output showing decibel levels of an input file">Graphic for audio</button></span>
<div id="astats" class="modal fade" tabindex="-1" role="dialog">