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add note about quantisation rates and MD5 (#293)

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Reto Kromer 2017-12-31 09:16:48 +01:00 committed by GitHub
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@ -1658,10 +1658,11 @@
<li>44.1 kHz: "asetnsamples=n=44100"</li>
<li>96 kHz: "asetnsamples=n=96000"</li>
</ul>
<p>Note: This filter trandscodes audio to 16 bit PCM by default. The generated framemd5s will represent this value. Validating these framemd5s will require using the same default settings.</p>
<p><b>Note:</b> This filter trandscodes audio to 16 bit PCM by default. The generated framemd5s will represent this value. Validating these framemd5s will require using the same default settings. Alternatively, when your file has another quantisation rates (e.g. 24 bit), then you might add the audio codec <code>-c:a pcm_s24le</code> to the command, for compatibility reasons with other tools, like <a href="https://mediaarea.net/BWFMetaEdit" target="_blank">BWF MetaEdit</a>.</p>
<dl>
<dt>ffmpeg</dt><dd>starts the command</dd>
<dt>-i <i>input_file</i></dt><dd>path, name and extension of the input file</dd>
<dt>-af "asetnsamples=n=<i>48000</i>"</dt><dd>the audio filter sets the sampling rate</dd>
<dt>-f framemd5</dt><dd>library used to calculate the MD5 checksums</dd>
<dt>-vn</dt><dd>ignores the video stream (video no)</dd>
<dt><i>output_file</i></dt><dd>path, name and extension of the output file</dd>