[Libav-user] 16-Bit RAW Video Recording Problem

[Carel Combrink]

Hi,

I am using FFmpeg and an external open source library to record video to
file. I want to record the RAW video to the file because I do not want to
waste time to do compression and I can not afford to lose information. In
most cases the video will be 1024x768 @ 40 fps ,16 bit greyscale.

The external library that I am using is FLITr:
https://code.google.com/p/flitr/

Using a previous version of FFmpeg this was working but after some updates
on FFmpeg and subsequently updates on FLITr to support the changes, the
recording is not working any more  I have spoken to the developers of FLITr
and we are not sure what we are doing wrong.

I have an old recording recorded when everything still worked and I compare
that to a recording made with the latest versions of the libraries and I
get the following results:

*Using ffplay:*
Recording that works (recorded on 12 September 2012):
>ffplay Recording_01.avi
ffplay version N-51683-g9dc88ac Copyright (c) 2003-2013 the FFmpeg
developers
  built on Apr  8 2013 21:22:02 with gcc 4.8.0 (GCC)
  configuration: --disable-static --enable-shared --enable-gpl
--enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib
--enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv
--enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype
--enable-libgsm --enable-libilbc --enable-libmp3lame
--enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg
--enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr
--enable-libspeex --enable-libtheora --enable-libtwolame
--enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis
--enable-libvpx
--enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  libavutil      52. 25.100 / 52. 25.100
  libavcodec     55.  2.100 / 55.  2.100
  libavformat    55.  1.100 / 55.  1.100
  libavdevice    55.  0.100 / 55.  0.100
  libavfilter     3. 49.101 /  3. 49.101
  libswscale      2.  2.100 /  2.  2.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
Input #0, matroska,webm, from 'LAB_OCON_Recording_01.avi':B f=0/0
  Metadata:
    ENCODER         : *Lavf54.25.104*
  Duration: 00:00:13.35, start: 0.000000, *bitrate: 503329 kb/s*
    Stream #0:0: Video: rawvideo *(Y1[0][16] / 0x10003159),
gray16le,*1024x768, SAR 1:1 DAR 4:3, 40 fps, 40 tbr, 1k tbn, 1k tbc
(default)
   4.27 A-V:  0.000 fd=  14 aq=    0KB vq= 9216KB sq=    0B f=0/0

New Recording:
>ffplay Recording.avi
ffplay version N-51683-g9dc88ac Copyright (c) 2003-2013 the FFmpeg
developers
  built on Apr  8 2013 21:22:02 with gcc 4.8.0 (GCC)
  configuration: --disable-static --enable-shared --enable-gpl
--enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib
--enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv
--enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype
--enable-libgsm --enable-libilbc --enable-libmp3lame
--enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg
--enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr
--enable-libspeex --enable-libtheora --enable-libtwolame
--enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis
--enable-libvpx
--enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  libavutil      52. 25.100 / 52. 25.100
  libavcodec     55.  2.100 / 55.  2.100
  libavformat    55.  1.100 / 55.  1.100
  libavdevice    55.  0.100 / 55.  0.100
  libavfilter     3. 49.101 /  3. 49.101
  libswscale      2.  2.100 /  2.  2.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
    nan A-V:  0.000 fd=   0 aq[rawvideo @ 01dc8c40] = Invalid pixel format.
    Last message repeated 1 times/ 0  L a s
Input #0, matroska,webm, from 'Recording.avi':
  Metadata:
    ENCODER         : *Lavf55.1.100*
  Duration: 00:00:00.70, start: 0.000000, *bitrate: N/A*
    Stream #0:0: Video: rawvideo, 1024x768, SAR 1:1 DAR 4:3, 40 fps, 40
tbr, 1k tbn, 1k tbc (default)
[rawvideo @ 01dc8c40] Invalid pixel format.
*Recording.avi: could not open codecs*

In *bold *I have marked the things that are very different on the 2
recordings. It appears that the header of the new recording is not set up
correctly.

Is there something that we are doing wrong when creating the recording or
is this a problem with FFmpeg?

PS: To look at the source code that starts the recording look at the
following file in FLITr:
https://code.google.com/p/flitr/source/browse/trunk/src/flitr/ffmpeg_writer.cpp
As mentioned, in the end I am using AV_CODEC_ID_RAWVIDEO as the codec and
the pixel format is chosen by FLITr as gray16le

Any help will be appreciated.

Regards,
Carel
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