Using FFMpeg for .mp3 file to .wav file conversion. This framework tool is also ideal and dependable in converting a .mp3 file to a .wav file format. Most Linux distributions come pre-installed with this audio conversion tool. To check if you already have it, run the following command on your terminal. ffmpeg -version

we use lame to convert MP3 file Wav and then we provide this wav file to SOX which can produce required ULAW file. I keep all the MP3 file in a directory and use the following commands on that directory.

WAV is a RIFF format, like AVI. Assuming whoever created the WAV file was working in Windows, they could have used any available ACM or DirectShow audio codec to compress or otherwise encode the streams in the file. It could be anything from PCM to MP3 to 4-bit ADPCM to u-Law. In addition, there may be byte-ordering to worry about.
First, create a file for your script. touch ffmpeg-batch.sh. Next, open it with your favorite text editor, and set it up as a bash script. #! /bin/bash. This script is going to use a series of variables for file paths, extensions, and FFMpeg options. This way, it’s flexible enough that you can pass it different files in different locations
Once installed you are ready to go. With the wav files located in a directory change to that directory to run the command. The format of the command will be: mpg123 -w file.wav file.mp3. The "-w" argument tells mpg123 that the output will be in the .wav format. The first file name is the output file name which is user configurable.
For example, say you have an MP3 file and want it converted into an OGG file: ffmpeg -i input.mp3 output.ogg. This command takes an MP3 file called input.mp3 and converts it into an OGG file called output.ogg. From FFmpeg's point of view, this means converting the MP3 audio stream into a Vorbis audio stream and wrapping this stream into an OGG
If you have lots of files to convert, you might want to do that in parallel: find . -name '*. wav' -type f -print0 | parallel -0 ffmpeg -i {} -c:a libfdk_aac -b:a 96k {.}.m4a Check this doc for how to work with parallel. If you don't have the tool, install it with brew install parallel. Scott's answer is perfectly fine too. Converting MP3's to WAV will not and can not possibly restore any of the audio quality that has already been lost, there's no sane support for metadata / tags which will be lost, and file size will grow massively (aprox 7-12 times larger files on average, depending on bitrate.
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ffmpeg -i book.mp3 -ar 16000 -ac 1 book.wav pocketsphinx_continuous -infile book.wav \ -hmm cmusphinx-en-us-8khz-5.2 -lm en-70k-0.2.lm \ 2>pocketsphinx.log >book.txt Sphinx works alright. I wouldn't rely on it to make a readable version of the text, but it's good enough that you can search it if you're looking for a particular quote. P6yex4.
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    • convert mp3 to wav linux