Implement decoding for 10bit Grayscale (Y only) pixelformat from DPX

[Christoph Gerstbauer]

Summary of the bug: Hello, we are using a Scanity HDR filmscanner which is able to create 10bit grayscale DPX files. Current ffmpeg versions are not able to decode/encode this pixelformat.
I need just to decode this pixelformat from DPX files from a Scanity scanner.
So, in fact, this is not a bug, it is an improvement ticket.

How to reproduce: just try to decode a DPX from the attached testbed (DPX_Samples_10Bit_Y_Only.zip).

C:\Users\gersti>ffmpegnew -i "I:\DPX\_DPX examples\Bojan\ffmpegticket\0090000.dpx"
ffmpeg version N-70803-g0f16dfd Copyright (c) 2000-2015 the FFmpeg developers
  built with gcc 4.9.2 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libblu
ray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrw
b --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --
enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enab
le-zlib
  libavutil      54. 20.100 / 54. 20.100
  libavcodec     56. 28.100 / 56. 28.100
  libavformat    56. 25.101 / 56. 25.101
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 12.100 /  5. 12.100
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  3.100 / 53.  3.100
[dpx @ 0000000002d27840] Packing 2 is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been impl
emented.
[dpx_pipe @ 0000000002d16600] decoding for stream 0 failed
[dpx_pipe @ 0000000002d16600] Could not find codec parameters for stream 0 (Video: dpx, none, 2048x1520): unspecified pixel format
Consider increasing the value for the 'analyzeduration' and 'probesize' options
I:\DPX\_DPX examples\Bojan\ffmpegticket\0090000.dpx: could not find codec parameters
Input #0, dpx_pipe, from 'I:\DPX\_DPX examples\Bojan\ffmpegticket\0090000.dpx':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: dpx, none, 2048x1520, 25 tbr, 25 tbn, 25 tbc
At least one output file must be specified

Additonal Information from SCANITY HDR:
Supported Pixel Formats:
*Bits per Component (Kodak Cineon, DPX): 8/10/16bit per Component
*Color Components (DPX, TIFF): RGB / RGBA / Y only / Alpha only

10 Bit Y Only:
SCANITY usually will generate a DPX V2.0 conform images in the 10
Bit Y only B image packing mode, which is used in the SPIRIT family.
This switch allows to change the image packing to the DPX V2.0
conform 10 Bit Y only A mode.

I guess ffmpeg means with "[dpx @ 0000000002d27840] Packing 2 is not implemented" the B IMAGE PACKING MODE.

Best Regards
Christoph Gerstbauer

[Christoph Gerstbauer]

first file of testbed

[Christoph Gerstbauer]

I was not able to upload both testbed DPX files (the second one was to big) so please use just this one:

0090000.7z

[Carl Eugen Hoyos]

Please also provide a 10 Bit Y only A mode file.

[Elon Musk]

Fixed in 61e6226a5a2212d3baf0e8b3fef7013c74037b5f.