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Reto Kromer 2018-07-28 10:01:02 +02:00 committed by GitHub
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<div class="hiding"> <div class="hiding">
<h3>SMPTE bars + Sine wave audio</h3> <h3>SMPTE bars + Sine wave audio</h3>
<p>Generate a SMPTE bars test video + a 1kHz sine wave as audio testsignal.</p> <p>Generate a SMPTE bars test video + a 1kHz sine wave as audio testsignal.</p>
<p><code>ffmpeg -f lavfi -i smptebars=size=720x576:rate=25 -f lavfi -i "sine=frequency=1000:sample_rate=48000" -c:a pcm_s16le -t 10 -c:v ffv1 <em>output_file</em></code></p> <p><code>ffmpeg -f lavfi -i "smptebars=size=720x576:rate=25" -f lavfi -i "sine=frequency=1000:sample_rate=48000" -c:a pcm_s16le -t 10 -c:v ffv1 <em>output_file</em></code></p>
<dl> <dl>
<dt>ffmpeg</dt><dd>starts the command</dd> <dt>ffmpeg</dt><dd>starts the command</dd>
<dt>-f lavfi</dt><dd>tells FFmpeg to use the <a href="https://ffmpeg.org/ffmpeg-devices.html#lavfi" target="_blank">libavfilter</a> input virtual device</dd> <dt>-f lavfi</dt><dd>tells FFmpeg to use the <a href="https://ffmpeg.org/ffmpeg-devices.html#lavfi" target="_blank">libavfilter</a> input virtual device</dd>