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Merge pull request #176 from amiaopensource/signature-examples

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Add examples for using new Signature filter
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Reto Kromer 2017-04-17 20:28:55 +02:00 committed by GitHub
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@ -1947,6 +1947,50 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
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<h3>Compare two video files for content similarity using perceptual hashing</h3>
<p><code>ffmpeg -i <i>input_one</i> -i <i>input_two</i> -filter_complex signature=detectmode=full:nb_inputs=2 -f null -</code></p>
<dl>
<dt>ffmpeg</dt><dd>starts the command</dd>
<dt>-i <i>input_one</i> -i <i>input_two</i></dt><dd>assigns the input files</dd>
<dt>-filter_complex</dt><dd>enables using more than one input file to the filter</dd>
<dt>signature=detectmode=full</dt><dd>Applies the signature filter to the inputs in 'full' mode. The other option is 'fast'.</dd>
<dt>nb_inputs=2</dt><dd>tells the filter to expect two input files</dd>
<dt>-f null -</dt><dd>Sets the output of ffmpeg to a null stream (since we are not creating a transcoded file, just viewing metadata).</dd>
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<h3>Generate a perceptual hash for an input video file</h3>
<p><code>ffmpeg -i <i>input</i> -vf signature=format=xml:filename="output.xml" -an -f null -</code></p>
<dl>
<dt>ffmpeg -i <i>input</i></dt><dd>starts the command using your input file</dd>
<dt>-vf signature=format=xml</dt><dd>applies the signature filter to the input file and sets the output format for the fingerprint to xml</dd>
<dt>filename="output.xml"</dt><dd>sets the output for the signature filter</dd>
<dt>-an</dt><dd>tells ffmpeg to ignore the audio stream of the input file</dd>
<dt>-f null -</dt><dd>Sets the ffmpeg output to a null stream (since we are only interested in the output generated by the filter).</dd>
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