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Another attempt at fade in/out documentation

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Hopefully I got all the uses of "frames" out. (let me know if one snuck in)
And I used the example that was used in the stackoverflow forum. 

This is for Issue: OG #386 / First attempt #422 / Now this attempt #424
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Lorena A Ramírez-López 2020-05-28 23:58:45 -04:00 committed by GitHub
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@ -734,12 +734,12 @@
<div class="hiding">
<h5>Fade both video and audio streams</h5>
<p><code>ffmpeg -i <em>input_file</em> -filter:v "fade=in:st=0:d=1, fade=out:st=59:d=1" -filter:a "afade=in:st=0:d=1, afade=out:st=59:d=1" -c:v libx264 -c:a aac <em>output_file</em></code></p>
<p>This command fades in and out the first and last 30 video frames and 44100 audio samples on a video</p>
<p>This command fades in and out the first and last second (and 44100 audio samples) on a video.</p>
<dl>
<dt>ffmpeg</dt><dd>starts the command</dd>
<dt>-i <em>input_file</em></dt><dd>path, name and extension of the input file</dd>
<dt>-filter:v "fade=in:st=0:d=1, fade=out:st=59:d=1"</dt><dd>applies a video filter that fades in the first and last 30 video frames</dd>
<dt>-filter:a "afade=in:st=0:d=1, afade=out:st=59:d=1"</dt><dd>applies an audio filter that fades in the first and last 30 video frames. <code>st</code> sets the start and <code>d</code> sets the duration.</dd>
<dt>-filter:v "fade=in:st=0:d=1, fade=out:st=59:d=1"</dt><dd>applies a video filter that fades in the first and last second of the video. (For example, it fades in and out on the first and last second of a 60s clip). <code>st</code> sets the start and <code>d</code> sets the duration.</dd>
<dt>-filter:a "afade=in:st=0:d=1, afade=out:st=59:d=1"</dt><dd>applies an audio filter that fades in the first and last second of the video. (For example, it fades in and out on the first and last second of a 60s clip). <code>st</code> sets the start and <code>d</code> sets the duration.</dd>
<dt>-c:v <em>video_codec</em></dt><dd>as a video filter is used, it is not possible to use <code>-c copy</code>. The video must be re-encoded with whatever video codec is chosen, e.g. <code>ffv1</code>, <code>v210</code> or <code>prores</code>.</dd>
<dt>-c:a <em>audio_codec</em></dt><dd>as an audio filter is used, it is not possible to use <code>-c copy</code>. The audio must be re-encoded with whatever audio codec is chosen, e.g. <code>aac</code>.</dd>
<dt><em>output_file</em></dt><dd>path, name and extension of the output_file</dd>