[FFmpeg-devel] State of MJ2 support?

[Benjamin Larsson]

Keith Hughitt wrote:
> Hello,
>
> I tried asking this question on the ffmpeg-users list last month, but
> haven't recieved any response so I thought i'd ask here:
>
> Does FFmpeg currently support decoding motion jpeg-2000 (mj2) movies?
> The version of FFmpeg I'm using lists support for decoding m2:
>
> [code]D  mov,mp4,m4a,3gp,3g2,mj2 QuickTime/MPEG4/Motion JPEG 2000 format[/code]
>
> However, when I try to convert a mj2 file (e.g.
> http://www.openjpeg.org/samples/Speedway.mj2) to another format,
>  it complains about an "unsupported codec" for the input stream:
>
> [code]
> $ ffmpeg -i Speedway.mj2 out.mp4
> FFmpeg version SVN-r15488, Copyright (c) 2000-2008 Fabrice Bellard, et al.
>   configuration: --enable-gpl --enable-postproc --enable-libvorbis
> --enable-liba52 --enable-libdc1394 --enable-libgsm --disable-debug
> --enable-libmp3lame --enable-libfaad --enable-libfaac --enable-libxvid
> --enable-pthreads
>   libavutil     49.11. 0 / 49.11. 0
>   libavcodec    52. 0. 0 / 52. 0. 0
>   libavformat   52.22. 1 / 52.22. 1
>   libavdevice   52. 1. 0 / 52. 1. 0
>   libpostproc   51. 2. 0 / 51. 2. 0
>   built on Sep 30 2008 12:58:40, gcc: 4.2.3 (Ubuntu 4.2.3-2ubuntu7)
> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Speedway.mj2':
>   Duration: 00:00:08.00, start: 0.000000, bitrate: 3018 kb/s
>     Stream #0.0(eng): Video: Motion JPEG2000, 352x288, 25.00 tb(r)
> File 'out.mp4' already exists. Overwrite ? [y/N] y
> Output #0, mp4, to 'out.mp4':
>     Stream #0.0(eng): Video: mpeg4, yuv420p, 352x288, q=2-31, 200 kb/s,
> 25.00 tb(c)
> Stream mapping:
>   Stream #0.0 -> #0.0
> Unsupported codec (id=0) for input stream #0.0
>
> [/code]
>
> Anyone know whether it can be done? Any help would be greatly appreciated.
>
> Thanks!
> Keith

FFmpeg does not support mj2 but as you are a developer (you did post on 
the mailinglist for development of FFmpeg) you can continue with the 
jpeg2000 SoC svn tree over at http://svn.mplayerhq.hu/soc/jpeg2000/.

MvH
Benjamin Larsson