[FFmpeg-trac] #10546(undetermined:new): improve vmix decoder

[FFmpeg]

#10546: improve vmix decoder
-------------------------------------+-------------------------------------
             Reporter:  ami_stuff    |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 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!
 }}}
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10546>
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