I am trying to use a program called arss to create a spectrogram from a wav file. I have 2 wav files, one works and the other does not (it was converted to wav from mp3).
The error that arss throws at me is:
This WAVE file is not currently supported.
Which is fine, but I have no idea what parts of my wav file to change so that it will be supported. The docs don't help here (as far as I can tell)
When I run mediainfo on both wav files, I get the following specs:
working wav:
General
Complete name : working.wav
Format : Wave
File size : 1.15 MiB
Duration : 6 s 306 ms
Overall bit rate mode : Constant
Overall bit rate : 1 536 kb/s
Audio
Format : PCM
Format settings : Little / Signed
Codec ID : 1
Duration : 6 s 306 ms
Bit rate mode : Constant
Bit rate : 1 536 kb/s
Channel(s) : 2 channels
Sampling rate : 48.0 kHz
Bit depth : 16 bits
Stream size : 1.15 MiB (100%)
not working wav:
General
Complete name : not_working.wav
Format : Wave
File size : 5.49 MiB
Duration : 30 s 0 ms
Overall bit rate mode : Constant
Overall bit rate : 1 536 kb/s
Writing application : Lavf57.83.100
Audio
Format : PCM
Format settings : Little / Signed
Codec ID : 1
Duration : 30 s 0 ms
Bit rate mode : Constant
Bit rate : 1 536 kb/s
Channel(s) : 2 channels
Sampling rate : 48.0 kHz
Bit depth : 16 bits
Stream size : 5.49 MiB (100%)
Comparing the audio specs of both files, I can't tell any difference between anything other than the file size and duration. I even updated the Sampling rate of the non-working wav using ffmpeg so that it would match the working one at 48.0kHz, but no luck.
Any idea?
Both wav files are available here.
FFmpeg, by default, writes a LIST chunk, with some metadata, before the data chunk. ARSS has a rigid parser and expects the data chunk to start at a fixed byte offset (0x24). FFmpeg can be told to skip writing the LIST chunk using the bitexact option.
ffmpeg -i not_working.wav -c copy -bitexact new.wav
Note that ARSS doesn't check for sampling rate, only that WAVs have little endian PCM.
Here's a related Q, not quite a duplicate, linked for future readers: