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add note for +faststart

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Weaver 2018-09-19 13:57:48 -07:00
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@ -303,6 +303,11 @@
AAC is the codec most often used for audio streams within an .mp4 container.</dd>
<dt><em>output_file</em></dt><dd>path, name and extension of the output file</dd>
</dl>
<p>In order to optimize the file for streaming, you can add this preset:</p>
<p><code>ffmpeg -i <em>input_file</em> -c:v libx264 -pix_fmt yuv420p -c:a aac -movflags +faststart <em>output_file</em></code></p>
<dl>
<dt>-movflags +faststart</dt><dd>This tells FFmpeg to move some of the essential metadata to the start of the file, which permits starting viewing before the file finishes downloading (an ideal characteristic for streaming).</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>
<p><code>ffmpeg -i <em>input_file</em> -c:v libx264 -pix_fmt yuv420p -preset veryslow -crf 18 -c:a aac <em>output_file</em></code></p>
<dl>