HQ quality mode decodes just fine, but SQ and LQ doesn't
./ffmpeg -i vmx1_sq.avi -y out.avi
ffmpeg version N-111893-gbef151d1ce Copyright (c) 2000-2023 the FFmpeg developers
built with gcc 11 (Ubuntu 11.4.0-1ubuntu1~22.04)
configuration:
libavutil 58. 19.100 / 58. 19.100
libavcodec 60. 25.100 / 60. 25.100
libavformat 60. 11.100 / 60. 11.100
libavdevice 60. 2.101 / 60. 2.101
libavfilter 9. 11.100 / 9. 11.100
libswscale 7. 3.100 / 7. 3.100
libswresample 4. 11.100 / 4. 11.100
Input #0, avi, from 'vmx1_sq.avi':
Metadata:
software : Lavf58.76.100
Duration: 00:00:00.07, start: 0.000000, bitrate: 21822 kb/s
Stream #0:0: Video: vmix (VMX1 / 0x31584D56), yuv422p, 720x480, 29.97 fps, 29.97 tbr, 29.97 tbn
Stream mapping:
Stream #0:0 -> #0:0 (vmix (native) -> mpeg4 (native))
Press [q] to stop, [?] for help
[vist#0:0/vmix @ 0x55fd064084c0] Decoding error: Invalid data found when processing input
Last message repeated 1 times
[vost#0:0/mpeg4 @ 0x55fd06408000] No filtered frames for output stream, trying to initialize anyway.
Output #0, avi, to 'out.avi':
Metadata:
software : Lavf58.76.100
ISFT : Lavf60.11.100
Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p(progressive), 720x480, q=2-31, 200 kb/s, 29.97 tbn
Metadata:
encoder : Lavc60.25.100 mpeg4
Side data:
cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
[vist#0:0/vmix @ 0x55fd064084c0] Decode error rate 1 exceeds maximum 0.666667
[out#0/avi @ 0x55fd06407240] video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
[out#0/avi @ 0x55fd06407240] Output file is empty, nothing was encoded(check -ss / -t / -frames parameters if used)
frame= 0 fps=0.0 q=0.0 Lsize= 6kB time=N/A bitrate=N/A speed=N/A
Conversion failed!
Fixed in 00a837c70ca2056fbd81ca4af41692e34ef79b69
The blocking/artifacts because of quantization factor is tracked in another vmix ticket, which should still not be closed. Need to decipher that table factors fully.