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add info about astats graph

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Andrew Weaver 2017-01-22 16:36:27 -08:00
parent 6e3ab82763
commit 63fe18e97e
1 changed files with 11 additions and 5 deletions
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index.html
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@ -417,20 +417,26 @@
<h4>Filters</h4>
<!-- astats -->
<span data-toggle="modal" data-target="#astats"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="********">astats</button></span>
<span data-toggle="modal" data-target="#astats"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Plays a graphical output showing decibel levels of an input file">astats</button></span>
<div id="astats" class="modal fade" tabindex="-1" role="dialog">
<div class="modal-dialog modal-lg">
<div class="modal-content">
<div class="well">
<h3><!-- accurate title --></h3>
<h3>Plays a graphical output showing decibel levels of an input file</h3>
<p><code>ffplay -f lavfi "amovie='input.mp3',astats=metadata=1:reset=1,adrawgraph=lavfi.astats.Overall.Peak_level:max=0:min=-30.0:size=700x256:bg=Black[out]"</code></p>
<dl>
<dt>ffplay</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>"</dt><dd>quotation mark to start command</dd>
<dt>movie='<i>input.mp3</i>'</dt><dd>declares audio file source to apply filter</dd>
<dt>,</dt><dd>comma signifies closing of video source assertion and ready for filter assertion</dd>
<!-- ??? -->
<dt>movie='<i>input.mp3</i>'</dt><dd>declares audio source file on which to apply filter</dd>
<dt>,</dt><dd>comma signifies the end of audio source section and the beginning of the filter section</dd>
<dt>astats=metadata=1</dt><dd>tells the astats filter to ouput metadata that can be passed to another filter (in this case adrawgraph)</dd>
<dt>:</dt><dd>divides beteen options of the same filter</dd>
<dt>reset=1</dt><dd>tells the filter to calculate the stats on every frame (increasing this number would calculate stats for groups of frames)</dd>
<dt>,</dt><dd>comma divides one filter in the chain from another</dd>
<dt>adrawgraph=lavfi.astats.Overall.Peak_level:max=0:min=-30.0</dt><dd>draws a graph using the overall peak volume calculated by the astats filter. It sets the max for the graph to 0 (dB) and the minimum to -30 (dB). For more options on data points that can be graphed see <a href="https://ffmpeg.org/ffmpeg-filters.html#astats-1" target="_blank">[more]</a></dd>
<dt>size=700x256:bg=Black</dt><dd>sets the background color and size of the output</dd>
<dt>[out]</dt><dd>ends the filterchain and sets the output</dd>
<dt>"</dt><dd>quotation mark to close command</dd>
</dl>
<div class="sample-image">