The --verbose/-v flag must be provided before the convert command. This will enable debugging logs and allow you to monitor progress. For example - to convert the contents of the directory input/, containing files of type .m4a and .flac, outputting to directory output/, converting to type .mp3 run: audioconvert convert input/ output/--output
If you plan to often convert Wma to mp3, the below script automatically convert and delete everything in the folder given as an argument, It improves a bit the above-mentioned. In addition, the ffmpeg command is a bit different than the first proposed, if the first one does not work, use the below one.

recompile ffmpeg with libmp3lame support by following the step-by-step guide How to Compile FFmpeg for Ubuntu, or; simply download a static build of ffmpeg via links on the FFmpeg Download page. Pipe alternative. You could pipe to lame instead: ffmpeg -i input -f wav - | lame - output.mp3

Used the the following command to convert the file: ffmpeg -i sample.mp3 sample.wav Most of the metadata in this table are taken from the FFmpeg metadata that were generated during conversion. Property
An AAC file from Apple, for instance, has been through one downsample from the original master file, which would have been at 24bit 44.1kHz WAV. This is the modern standard for master delivery to distributors. Though not absolutely perfect, this is the best you can generally access as a consumer. Depending on your source, MP3 @320k or AAC @256k
Had a similar problem with ffmpeg.exe (4.3.1), but everything works fine with ffmpeg-20200802-b48397e-win64-static, since mp3_mf is not used in the standard container there (WAV/MP3 in your problem, AVI in my problem). So if you can't switch to a different ffmpeg version, you should force it to use libmp3lame, not just mp3
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convert mp3 to wav ffmpeg