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Update: Adding fade/afade to streams

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Lorena A Ramírez-López 2020-05-01 23:03:25 -04:00 committed by GitHub
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@ -729,11 +729,32 @@
</div>
<!-- ends Modify speed -->
<!-- Fade both video and audio streams -->
<label class="recipe" for="fade_streams">Fade both video and audio streams</label>
<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 30 video frames 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>-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>
</dl>
<p class="link"></p>
</div>
<!-- ends Fade both video and audio streams -->
<!-- Synchronize video and audio streams -->
<label class="recipe" for="sync_streams">Synchronize video and audio streams</label>
<input type="checkbox" id="sync_streams">
<div class="hiding">
<h5>Synchronize video and audio streams</h5>
<p><code>ffmpeg -i <em>input_file</em> -itsoffset 0.125 -i <em>input_file</em> -map 1:v -map 0:a -c copy <em>output_file</em></code></p>
<p>A command to slip the video channel approximate 2 frames (0.125 for a 25fps timeline) to align video and audio drift, if generated during video tape capture for example.</p>
<dl>