Когда я попробовал:
sox file.wav -c 1 file.wav
Я получил:
sox WARN wav: Premature EOF on .wav input file
Когда я попробовал:
ffmpeg -i file.wav -ac 1 file.wav
Я получил:
[pcm_s16le @ 0x2997880] Invalid PCM packet, data has size 2 but at least a size of 4 was expected
Error while decoding stream #0:0: Invalid data found when processing input