Non-mjpeg file with fourcc MSC2

[Carl Eugen Hoyos]

FFmpeg supports Geutebrueck Multiscope II files from a security camera with FourCC MSC2, see ticket #4535: ​http://samples.ffmpeg.org/ffmpeg-bugs/trac/ticket4535
All files contain a specific variant of mjpeg with an encoded resolution of 704x288, no audio. The files are supported except for an incorrect aspect ratio.
A user uploaded a file CapturedMovie.mrec that is an avi with Fourcc MSC2. It contains silent pcm audio and video frames of very different size, maybe I- and P-frames, possibly a screen capture codec with a four byte header but not mjpeg afaict.

$ ffmpeg -i CapturedMovie.mrec
ffmpeg version N-78214-g9938697 Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 4.7 (SUSE Linux)
  configuration: --enable-gpl
  libavutil      55. 16.101 / 55. 16.101
  libavcodec     57. 24.100 / 57. 24.100
  libavformat    57. 23.101 / 57. 23.101
  libavdevice    57.  0.101 / 57.  0.101
  libavfilter     6. 27.100 /  6. 27.100
  libswscale      4.  0.100 /  4.  0.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
[mjpeg @ 0x2f4c1c0] bits 145 is invalid
[mjpeg @ 0x2f4c1c0] No JPEG data found in image
    Last message repeated 3 times
[mjpeg @ 0x2f4c1c0] bits 230 is invalid
[mjpeg @ 0x2f4c1c0] No JPEG data found in image
[mjpeg @ 0x2f4c1c0] bits 171 is invalid
[mjpeg @ 0x2f4c1c0] bits 77 is invalid
[mjpeg @ 0x2f4c1c0] bits 163 is invalid
[mjpeg @ 0x2f4c1c0] No JPEG data found in image
[mjpeg @ 0x2f4c1c0] bits 206 is invalid
[mjpeg @ 0x2f4c1c0] No JPEG data found in image
    Last message repeated 1 times
[mjpeg @ 0x2f4c1c0] bits 219 is invalid
[mjpeg @ 0x2f4c1c0] No JPEG data found in image
[mjpeg @ 0x2f4c1c0] bits 223 is invalid
[mjpeg @ 0x2f4c1c0] bits 35 is invalid
[mjpeg @ 0x2f4c1c0] No JPEG data found in image
    Last message repeated 82 times
[mjpeg @ 0x2f4c1c0] bits 145 is invalid
[mjpeg @ 0x2f4c1c0] No JPEG data found in image
    Last message repeated 35 times
[avi @ 0x2f4b280] decoding for stream 0 failed
[avi @ 0x2f4b280] Could not find codec parameters for stream 0 (Video: mjpeg (MSC2 / 0x3243534D), none(bt470bg/unknown/unknown), 480x360, lossless, 26617 kb/s): unspecified pixel format
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Guessed Channel Layout for  Input Stream #0.1 : stereo
Input #0, avi, from 'CapturedMovie.mrec':
  Duration: 00:00:59.03, start: 0.000000, bitrate: 28030 kb/s
    Stream #0:0: Video: mjpeg (MSC2 / 0x3243534D), none(bt470bg/unknown/unknown), 480x360, lossless, 26617 kb/s, SAR 1:1 DAR 4:3, 30 fps, 30 tbr, 30 tbn, 30 tbc
    Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, 2 channels, s16, 1411 kb/s
At least one output file must be specified

[Carl Eugen Hoyos]

​http://samples.ffmpeg.org/ffmpeg-bugs/trac/ticket5207