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Merge pull request #159 from amiaopensource/ab/audio-testfile

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adds audio testfile (sine wave)
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Reto Kromer 2017-03-02 16:44:46 +01:00 committed by GitHub
commit 63879e0e51
1 changed files with 24 additions and 1 deletions
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index.html
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@ -1258,7 +1258,7 @@ foreach ($file in $inputfiles) {
</div>
<div class="well">
<h4>Test videos</h4>
<h4>Test files</h4>
<!-- Mandelbrot -->
<span data-toggle="modal" data-target="#mandelbrot"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Make a mandelbrot test pattern video">Mandelbrot</button></span>
@ -1372,6 +1372,29 @@ foreach ($file in $inputfiles) {
</div>
<!-- ends Play VGA SMPTE bars -->
<!-- Sine wave -->
<span data-toggle="modal" data-target="#sine_wave"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Generate a test audio file playing a sine wave">Sine wave</button></span>
<div id="sine_wave" class="modal fade" tabindex="-1" role="dialog">
<div class="modal-dialog modal-lg">
<div class="modal-content">
<div class="well">
<h3>Sine wave</h3>
<p>Generate a test audio file playing a sine wave.</p>
<p><code>ffmpeg -f lavfi -i "sine=frequency=1000:sample_rate=48000:duration=5" -c:a pcm_s16le <i>output_file</i>.wav</code></p>
<dl>
<dt>ffmpeg</dt><dd>starts the command</dd>
<dt>-f lavfi</dt><dd>tells ffmpeg to use the libavfilter input virtual device <a href="http://ffmpeg.org/ffmpeg-devices.html#lavfi" target="_blank">[more]</a></dd>
<dt>-i "sine=frequency=1000:sample_rate=48000:duration=5"</dt><dd>Sets the signal to 1000 Hz, sampling at 48 kHz, and for 5 seconds</dd>
<dt>-c:a pcm_s16le</dt><dd>encodes the audio codec in <code>pcm_s16le</code> (the default encoding for wav files). pcm represents pulse-code modulation format (raw bytes), <code>16</code> means 16 bits per sample, and <code>le</code> means "little endian"</dd>
<dt><i>output_file</i>.wav</dt><dd>path, name and extension of the output file</dd>
</dl>
<p class="link"></p>
</div>
</div>
</div>
</div>
<!-- ends Sine wave -->
</div>
<div class="well">
<h4>Other</h4>