Unknown format when parsing wav stretched by rubberband

[binarykitchen]

Looks like there is a problem when parsing wav files that have been stretched by rubberband. Here an example error

{ error: true,
  invalid_reasons: [ 'Unknwon format: 22127' ],
  header: 
   { riff_head: 'RIFF',
     chunk_size: 6554,
     wave_identifier: 'WAVE',
     fmt_identifier: 'fmt ',
     subchunk_size: 3326,
     audio_format: 22127,
     num_channels: 1,
     sample_rate: 44100,
     byte_rate: 0,
     block_align: 2,
     bits_per_sample: 16,
     data_identifier: 'k\f\u0002\u001e' },
  stats: 
   { ... } }

Trying to grab the duration of the file here. Any clues?

[binarykitchen]

http://soundfile.sapp.org/doc/WaveFormat/ says

20        2   AudioFormat      PCM = 1 (i.e. Linear quantization)
                               Values other than 1 indicate some 
                               form of compression.

and since rubberband does stretch files, the format 22127 is probably valid and indicating some kind of compression?

[binarykitchen]

Btw, the ffmpeg command I used to generate that stretched wav file was

ffmpeg -thread_queue_size 2048 -i /home/michael-heuberger/binarykitchen/code/videomail.io/var/local/tmp/clients/videomail.io/11e6-aebd-f5430180-84c7-074d5706928b/videomail_preview.wav -y -acodec libvorbis -ac 1 -filter:a rubberband=tempo=1.454366279637038 -loglevel warning /home/michael-heuberger/binarykitchen/code/videomail.io/var/local/tmp/clients/videomail.io/11e6-aebd-f5430180-84c7-074d5706928b/videomail_preview_for_webm_stretched.wav

[drj-io]

Hi thanks for all the info!

We'll take a look ASAP

[ghost]

Vorbis in WAV is an odd combination. Removing -c:a libvorbis from the command will solve the issue. The "Unknwon" typo could be fixed though.

[binarykitchen]

right, that audio codec was unnecessary.

but yeah, fixing the unknown typo would be good, thanks

[drj-io]

Thanks guys! We'll correct the typo.

[binarykitchen]

Thx