[FFmpeg-trac] #6995(avformat:new): Support USM format

[FFmpeg]

#6995: Support USM format
-------------------------------------+-------------------------------------
               Reporter:  llogan     |                  Owner:
                   Type:             |                 Status:  new
  enhancement                        |              Component:  avformat
               Priority:  wish       |               Keywords:  usm
                Version:  git-       |  mpegvideo
  master                             |               Blocking:
             Blocked By:             |  Analyzed by developer:  0
Reproduced by developer:  0          |
-------------------------------------+-------------------------------------
 User "Win Is Best" provided two USM files from the game "Metal Gear
 Rising: Revengeance".

 {{{
 $ ffmpeg -f mpegvideo -i ev9020.usm
 ffmpeg version N-89933-g782e066e3e Copyright (c) 2000-2018 the FFmpeg
 developers
   built with gcc 7.2.1 (GCC) 20171224
   configuration:
   libavutil      56.  7.100 / 56.  7.100
   libavcodec     58.  9.100 / 58.  9.100
   libavformat    58.  7.100 / 58.  7.100
   libavdevice    58.  0.101 / 58.  0.101
   libavfilter     7. 11.101 /  7. 11.101
   libswscale      5.  0.101 /  5.  0.101
   libswresample   3.  0.101 /  3.  0.101
 [mpeg1video @ 0x5607764ae4c0] Invalid frame dimensions 0x0.
     Last message repeated 4 times
 [mpeg1video @ 0x5607764ae4c0] slice below image (55 >= 45)
 [mpegvideo @ 0x5607764a4580] Estimating duration from bitrate, this may be
 inaccurate
 Input #0, mpegvideo, from 'ev9020.usm':
   Duration: 00:00:01.84, bitrate: 104857 kb/s
     Stream #0:0: Video: mpeg1video, yuv420p(tv), 1280x720 [SAR 1:1 DAR
 16:9], 104857 kb/s, 29.50 fps, 29.97 tbr, 1200k tbn, 29.97 tbc
 At least one output file must be specified
 }}}

 Samples:

 https://0x0.st/sb2p.usm - Originally named `eva200.usm`. Link will remain
 valid for 362 days.
 https://0x0.st/sb2f.usm - Originally named `ev9020.usm`. Link will remain
 valid for 281 days.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/6995>
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