bgrp10le in nut muxed or demuxed as rgb555le

[Peter B.]

Summary of the bug:
Encoding pix_fmt GBRP10LE rawvideo in a NUT container produces RGB555LE files (without saying so).
Playing the resulting file with ffplay displays wrong colors: Everything is blue/green.

How to reproduce:

$ ffmpeg_git -f lavfi -i mandelbrot -t 1 -f nut -an -vcodec rawvideo -pix_fmt gbrp10le output.nut

ffmpeg version N-50025-gb8bb661 Copyright (c) 2000-2013 the FFmpeg developers
  built on Feb 17 2013 10:44:03 with gcc 4.6.1 (Ubuntu/Linaro 4.6.1-9ubuntu3)
  configuration: --prefix=/usr/local --enable-gpl --enable-nonfree --enable-version3 --enable-postproc --enable-swscale --enable-avfilter --enable-pthreads --enable-bzlib --enable-libmp3lame --enable-libvorbis --enable-libxvid --enable-zlib --enable-libopenjpeg --enable-decoder=png --enable-encoder=png --enable-libfreetype --enable-libschroedinger
  libavutil      52. 17.101 / 52. 17.101
  libavcodec     54. 91.103 / 54. 91.103
  libavformat    54. 63.100 / 54. 63.100
  libavdevice    54.  3.103 / 54.  3.103
  libavfilter     3. 38.100 /  3. 38.100
  libswscale      2.  2.100 /  2.  2.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
[lavfi @ 0x252a040] Estimating duration from bitrate, this may be inaccurate
Input #0, lavfi, from 'mandelbrot':
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: rawvideo (RGBA / 0x41424752), rgba, 640x480 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
Output #0, nut, to 'output.nut':
  Metadata:
    encoder         : Lavf54.63.100
    Stream #0:0: Video: rawvideo (RGB[15] / 0xF424752), gbrp10le, 640x480 [SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 51200 tbn, 25 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo -> rawvideo)
Press [q] to stop, [?] for help
frame=   25 fps=0.0 q=0.0 Lsize=   45001kB time=00:00:01.00 bitrate=368648.8kbits/s    
video:45000kB audio:0kB subtitle:0 global headers:0kB muxing overhead 0.002396%

$ ffprobe_git output.nut

ffprobe version N-50025-gb8bb661 Copyright (c) 2007-2013 the FFmpeg developers
  built on Feb 17 2013 10:44:03 with gcc 4.6.1 (Ubuntu/Linaro 4.6.1-9ubuntu3)
  configuration: --prefix=/usr/local --enable-gpl --enable-nonfree --enable-version3 --enable-postproc --enable-swscale --enable-avfilter --enable-pthreads --enable-bzlib --enable-libmp3lame --enable-libvorbis --enable-libxvid --enable-zlib --enable-libopenjpeg --enable-decoder=png --enable-encoder=png --enable-libfreetype --enable-libschroedinger
  libavutil      52. 17.101 / 52. 17.101
  libavcodec     54. 91.103 / 54. 91.103
  libavformat    54. 63.100 / 54. 63.100
  libavdevice    54.  3.103 / 54.  3.103
  libavfilter     3. 38.100 /  3. 38.100
  libswscale      2.  2.100 /  2.  2.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
[nut @ 0x252a420] Estimating duration from bitrate, this may be inaccurate
Input #0, nut, from 'output.nut':
  Metadata:
    encoder         : Lavf54.63.100
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: rawvideo (RGB[15] / 0xF424752), rgb555le, 640x480, SAR 1:1 DAR 4:3, 25 fps, 25 tbr, 51200 tbn, 51200 tbc

[Carl Eugen Hoyos]

This has to be discussed on ​nut-devel

[Michael Niedermayer]

Fixed by db8578a809f5050abbeee3d6baa47f77fab21c39 and 12538bb9c2f4424a822d9dbd4424286da986f2dc