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More generic instructions for Fade in/out

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Took out the audio example. 
Took out mini example.
Took out hardcoded attributes.
Added IN_POINT, OUT_POINT, DURATION to the time in seconds (expressed as integers) per kfrn suggestion
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Lorena A Ramírez-López 2020-05-31 11:48:36 -04:00 committed by GitHub
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@ -733,13 +733,13 @@
<input type="checkbox" id="fade_streams">
<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 second (and 44100 audio samples) on a video.</p>
<p><code>ffmpeg -i <em>input_file</em> -filter:v "fade=in:st=IN_POINT:d=DURATION, fade=out:st=OUT_POINT:d=DURATION" -filter:a "afade=in:st=OUT_POINT:d=DURATION, afade=out:st=IN_POINT:d=DURATION" -c:v libx264 -c:a aac <em>output_file</em></code></p>
<p>This command fades in and out the first and last second on a video. Change IN_POINT, OUT_POINT, DURATION to the time in seconds (expressed as integers) you want.</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 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>-filter:v "fade=in:st=IN_POINT:d=DURATION, fade=out:st=OUT_POINT:d=DURATION"</dt><dd>applies a video filter that fades in the first and last second of the video. <code>st</code> sets the start and <code>d</code> sets the duration.</dd>
<dt>-filter:a "afade=in:st=IN_POINT:d=DURATION, afade=out:st=OUT_POINT:d=DURATION"</dt><dd>applies an audio filter that fades in the first and last second of the video. <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>