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I've a .mp3 file and need to convert that to an 1 channel 8kHz 8 bit wav file, anyone know how I can do that with mplayer ? If not, any other commandline tools I could use ?
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I've a .mp3 file and need to convert that to an 1 channel 8kHz 8 bit wav file, anyone know how I can do that with mplayer ? If not, any other commandline tools I could use ?
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ffmpeg should do the job. This line will convert to 8kHz 1 channel wav file.
ffmpeg -i input.mp3 -ar 8000 -ac 1 output.wav
http://ffmpeg.org/ffmpeg-doc.html#SEC11
I'm not sure about the 8 bits requirement - what are you referring to? It's not the bitrate surely?
it's the bits-per-sample, analagous to the color depth of a picture. CDDA-style PCM (std WAV) is 16-bit 44.1kHz stereo; he wants output of 8-bit 8kHz mono. – quack quixote – 2010-01-12T10:02:16.877
8 bit per sample – None – 2010-01-12T10:06:19.240
In that case the line should be: ffmpeg -i input.mp3 -ar 8000 -ac 1 -acodec pcm_u8 output.wav – Iain – 2010-01-12T10:14:27.850
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lame, the command-line WAV to MP3 encoder, can also decode MP3 to WAV with the --decode
switch.
As user-friendly tools are concerned, I also like mpg321 for decoding: mpg321 input.mp3 -w output.wav
When I tried lame, it got the duration (play time) wrong in the output file, whereas with mpg321 it came out correct. – Jo Liss – 2016-01-31T20:43:48.677
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SoX can also do this; assuming your SoX is compiled with MP3 support, all you'd need is
sox input.mp3 -c 1 -r 8000 -1 output.wav
... although you might run into clipping issues, in which case you'd want to play with the vol
and/or mixer
effects to decrease the volume of the input channels before the resampling happens.
Without MP3-enabled SoX, use an MP3 decoder to convert your MP3 to WAV first, then the above command becomes:
sox input.wav -c 1 -r 8000 -1 output.wav
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mplayer -srate 8000 -vo null -vc null -ao pcm:fast:file="$fn.wav" "$fn"
This will also work for extracting the audio track from videos, and any other media file mplayer was configured to handle.
That might be obvious, but keep in mind that you cannot regain the quality that was lost when it the mp3 compression was applied. – ℝaphink – 2010-01-12T09:57:37.417