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change WAV->MP3 to constant quality

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Andrew Weaver 2016-11-16 15:36:41 -05:00
parent ab1412b4a8
commit 5ecc763f6d
1 changed files with 2 additions and 2 deletions
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@ -46,7 +46,7 @@
<div class="modal-content">
<div class="well">
<h3>WAV to MP3</h3>
<p><code>ffmpeg -i <i>input_file</i>.wav -write_id3v1 1 -id3v2_version 3 -dither_method modified_e_weighted -out_sample_rate 48k -b:a 320k <i>output_file</i>.mp3</code></p>
<p><code>ffmpeg -i <i>input_file</i>.wav -write_id3v1 1 -id3v2_version 3 -dither_method modified_e_weighted -out_sample_rate 48k -qscale:a 1 <i>output_file</i>.mp3</code></p>
<p>This will convert your WAV files to MP3s.</p>
<dl>
<dt>ffmpeg</dt><dd>starts the command</dd>
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<dt>-id3v2_version <i>3</i></dt><dd>Write ID3v2 tag. This will add metadata to a newer MP3 format, assuming you’ve embedded metadata into the WAV file.</dd>
<dt>-dither_method <i>modified_e_weighted</i></dt><dd>Dither makes sure you don’t unnecessarily truncate the dynamic range of your audio.</dd>
<dt>-out_sample_rate <i>48k</i></dt><dd>Sets the audio sampling frequency to 48 kHz. This can be omitted to use the same sampling frequency as the input.</dd>
<dt>-b:a <i>320k</i></dt><dd>This sets the bit rate at the highest rate the MP3 format allows. Reduce this to 160k for mono files.</dd>
<dt>-qscale:a <i>1</i></dt><dd>This sets the encoder to use a constant quality with a variable bitrate of between 190-250kbit/s. If you would prefer to use a constant bitrate, this could be replaced with <code>-b:a 320k</code> to set to the maximum bitrate allowed by the MP3 format. For more detailed discussion on variable vs constant bitrates see <a href="https://trac.ffmpeg.org/wiki/Encode/MP3" target="_blank">here.</a></dd>
<dt><i>output_file</i></dt><dd>path and name of the output file</dd>
</dl>
<p class="link"></p>