dpx parser is more strict than the dpx decoder

[Carl Eugen Hoyos]

​http://thread.gmane.org/gmane.comp.video.ffmpeg.libav.user/12337/focus=12504
The dpx sample fate-suite/dpx/lighthouse_rgb48.dpx has an incorrect filesize written in the header, works fine with the lavc decoder, the lavc parser cuts the file.

$ cat fate-suite/dpx/lighthouse_rgb48.dpx | ./ffmpeg -f image2pipe -vcodec dpx -i - out.png
ffmpeg version N-60762-g3edc3b1 Copyright (c) 2000-2014 the FFmpeg developers
  built on Feb 20 2014 09:30:22 with gcc 4.7 (SUSE Linux)
  configuration: --enable-gpl
  libavutil      52. 65.100 / 52. 65.100
  libavcodec     55. 52.102 / 55. 52.102
  libavformat    55. 33.100 / 55. 33.100
  libavdevice    55. 10.100 / 55. 10.100
  libavfilter     4.  1.103 /  4.  1.103
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 17.104 /  0. 17.104
  libpostproc    52.  3.100 / 52.  3.100
[dpx @ 0x2ad3b20] Overread buffer. Invalid header?
Input #0, image2pipe, from 'pipe:':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: dpx, rgb48be, 768x512, 25 tbr, 25 tbn, 25 tbc
Output #0, image2, to 'out.png':
  Metadata:
    encoder         : Lavf55.33.100
    Stream #0:0: Video: png, rgb48be, 768x512, q=2-31, 200 kb/s, 90k tbn, 25 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (dpx -> png)
[dpx @ 0x2ad3b20] Overread buffer. Invalid header?
Error while decoding stream #0:0: Invalid data found when processing input
pipe:: Input/output error
frame=    0 fps=0.0 q=0.0 Lsize=N/A time=00:00:00.00 bitrate=N/A
video:0kB audio:0kB subtitle:0 data:0 global headers:0kB muxing overhead -inf%
Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)

[Michael Niedermayer]

Fixed in fba0ac28055d3dca2846ea41d3326f08455d1a4d