[FFmpeg-user] Creating Motion JPEG 2000 Images

[Pierre-Anthony Lemieux]

The kdu_v_compress tool at [1] can create MJ2 files.

[1] https://kakadusoftware.com/documentation-downloads/downloads/

On Mon, Jul 29, 2024 at 2:12 PM Aaron Boxer via ffmpeg-user
<ffmpeg-user at ffmpeg.org> wrote:
>
> Hi Oliver,
>
> Thanks very much for your reply. I want to create mj2 files to test an mj2 reader. So, what I really need are some mj2 test images - I have only been able to find one so far on the internet.
> If you know where I can find more, that would also be great.
>
> Thanks,
> Aaron
>
>
>
>
> On Monday, 29 July 2024 at 15:40, Oliver Fromme <oliver at fromme.com> wrote:
>
> >
> >
> > Aaron Boxer via ffmpeg-user wrote:
> >
> > > I am able to play back mj2 clips with ffmpeg; can I also create mj2 files
> >
> > > by converting from say mp4 ?
> >
> >
> > No, unfortunately that's not supported.
> > Excerpt from the output of ``ffmpeg -formats'':
> >
> > D mov,mp4,m4a,3gp,3g2,mj2 QuickTime / MOV
> >
> > The "D" in the first column means that FFmpeg can only read these
> > files, but not write them. Basically, .mj2 files are just MP4
> > containers (or Quicktime) with frames that are JPEG-2000 images.
> >
> > There are also "raw" MJPEG2k files, but FFmpeg cannot write them
> > either (this is a raw stream of JPEG2k images):
> >
> > D mjpeg_2000 raw MJPEG 2000 video
> >
> > Just out of curiosity, why do you need to create MJPEG2k files?
> > In general, I recommend against doing that, unless you need it
> > for compatibility with a certain piece of hardware or software
> > that isn’t able to handle anything else.
> >
> > Best regards
> > -- Oliver
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