mv30: upside-down output

[ami_stuff]

FFmpeg decodes MV30 files upside-down while the original codec decodes them correctly.

I have also created my own samples and the same problem happens with them.

​https://samples.ffmpeg.org/V-codecs/mv30.avi

./ffmpeg -i mv30.avi -y out.avi
ffmpeg version N-109867-g5247dab6b1 Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 9 (Ubuntu 9.4.0-1ubuntu1~20.04.1)
  configuration: 
  libavutil      58.  1.100 / 58.  1.100
  libavcodec     60.  2.100 / 60.  2.100
  libavformat    60.  2.100 / 60.  2.100
  libavdevice    60.  0.100 / 60.  0.100
  libavfilter     9.  1.100 /  9.  1.100
  libswscale      7.  0.100 /  7.  0.100
  libswresample   4.  9.100 /  4.  9.100
Input #0, avi, from 'mv30.avi':
  Metadata:
    software        : MEncoder Sherpya-SVN-r28126-4.2.5
  Duration: 00:00:02.00, start: 0.000000, bitrate: 3842 kb/s
  Stream #0:0: Video: mv30 (MV30 / 0x3033564D), yuv420p(pc), 320x240, 3955 kb/s, SAR 1:1 DAR 4:3, 15 fps, 15 tbr, 15 tbn
Stream mapping:
  Stream #0:0 -> #0:0 (mv30 (native) -> mpeg4 (native))
Press [q] to stop, [?] for help
Output #0, avi, to 'out.avi':
  Metadata:
    software        : MEncoder Sherpya-SVN-r28126-4.2.5
    ISFT            : Lavf60.2.100
  Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p(pc, progressive), 320x240 [SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 15 fps, 15 tbn
    Metadata:
      encoder         : Lavc60.2.100 mpeg4
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
frame=    1 fps=0.0 q=4.2 size=       0kB time=00:00:00.00 bitrate=N/A speed=N/Aframe=   30 fps=0.0 q=11.8 Lsize=     120kB time=00:00:01.93 bitrate= 507.7kbits/s speed=21.7x    
video:113kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 5.594285%

[Elon Musk]

What a delight to instant close duplicate tickets #8613

[ami_stuff]

Replying to Elon Musk:

#8613

wow that was unexpected