I can create more samples upon request.
from old ffmpeg:
[on2avc @ 03912420] stereo mode window for mono audio
Error while decoding stream #0:1: Invalid data found when processing input
[on2avc @ 03912420] stereo mode window for mono audio
Error while decoding stream #0:1: Invalid data found when processing input
[on2avc @ 03912420] stereo mode window for mono audio
Error while decoding stream #0:1: Invalid data found when processing input
[on2avc @ 03912420] stereo mode window for mono audio
Error while decoding stream #0:1: Invalid data found when processing input
[on2avc @ 03912420] stereo mode window for mono audio
Error while decoding stream #0:1: Invalid data found when processing input
[on2avc @ 03912420] stereo mode window for mono audio
Error while decoding stream #0:1: Invalid data found when processing input
C:\>ffmpeg -i mono_44khz_256kbps.vp7 out.wav
ffmpeg version 3.2.git Copyright (c) 2000-2016 the FFmpeg developers
built with gcc 4.6.2 (GCC)
configuration: --disable-pthreads --enable-gpl --disable-ffprobe
libavutil 55. 36.100 / 55. 36.100
libavcodec 57. 66.101 / 57. 66.101
libavformat 57. 57.100 / 57. 57.100
libavdevice 57. 2.100 / 57. 2.100
libavfilter 6. 66.100 / 6. 66.100
libswscale 4. 3.100 / 4. 3.100
libswresample 2. 4.100 / 2. 4.100
libpostproc 54. 2.100 / 54. 2.100
[vp7 @ 0222d2c0] Warning: not compiled with thread support, using thread emulati
on
[on2avc @ 025b88c0] Warning: not compiled with thread support, using thread emul
ation
Input #0, avi, from 'mono_44khz_256kbps.vp7':
Duration: 00:00:37.94, start: 0.000000, bitrate: 369 kb/s
Stream #0:0: Video: vp7 (VP70 / 0x30375056), yuv420p, 320x240, 107 kb/s, 23.
97 fps, 23.97 tbr, 23.97 tbn, 23.97 tbc
Stream #0:1: Audio: avc ([1][5][0][0] / 0x0501), 44100 Hz, mono, fltp, 256 k
b/s
[on2avc @ 0222f860] Warning: not compiled with thread support, using thread emul
ation
[pcm_s16le @ 025d3820] Warning: not compiled with thread support, using thread e
mulation
Output #0, wav, to 'out.wav':
Metadata:
ISFT : Lavf57.57.100
Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, mono, s16,
705 kb/s
Metadata:
encoder : Lavc57.66.101 pcm_s16le
Stream mapping:
Stream #0:1 -> #0:0 (avc (on2avc) -> pcm_s16le (native))
Press [q] to stop, [?] for help
size= 3268kB time=00:00:37.94 bitrate= 705.6kbits/s speed= 173x
video:0kB audio:3268kB subtitle:0kB other streams:0kB global headers:0kB muxing
overhead: 0.002331%
This is duplicate of another on2avc bug, I already lost too much time on this fringe and non elegant codec. So consider giving bounty if you want it fixed.