[FFmpeg-devel] Support for dumping pgx for JPEG2000

[Gautam Ramakrishnan]

On Mon, Jun 22, 2020 at 11:30 PM Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:
>
> Am Mo., 22. Juni 2020 um 19:40 Uhr schrieb Gautam Ramakrishnan
> <gautamramk at gmail.com>:
> >
> > On Mon, Jun 22, 2020 at 8:07 PM Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:
> > >
> > >
> > >
> > > > Am 22.06.2020 um 12:42 schrieb Moritz Barsnick <barsnick at gmx.net>:
> > > >
> > > >> On Mon, Jun 22, 2020 at 12:47:11 +0530, Gautam Ramakrishnan wrote:
> > > >> On Mon, Jun 22, 2020 at 12:38 PM Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:
> > > >>>> Am 22.06.2020 um 07:32 schrieb Gautam Ramakrishnan <gautamramk at gmail.com>:
> > > >>>> JPEG2000 uses .pgx format for conformance testing. Is it a good idea
> > > >>>> to allow the ffmpeg native decoder to have an option to dump .pgx files?
> > > >>> I believe it would be more useful if FFmpeg could read pgx files.
> > > >> So could a new Codec be created for reading and writing pgx files?
> > > >
> > > > Actually, probably a very simple demuxer/muxer, as the payload seems
> > > > to be uncompressed/raw.
> > >
> > > Most likely a decoder as for pnm or tga.
>
> > I shall work on this. The format seems really simple. However,
> > how do I make the encoder write multiple files and the decoder
> > read multiple files? Each component would map to one .pgx file.
>
> You only read one of the files at a time, the extractplanes filter can
> be used to compare the content.
>
> Carl Eugen
> _______________________________________________
> ffmpeg-devel mailing list
> ffmpeg-devel at ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>
> To unsubscribe, visit link above, or email
> ffmpeg-devel-request at ffmpeg.org with subject "unsubscribe".

So what you mean to say is if I am given say 3 pgx files for r g and b
components respectively, the decoder would not decode all of them into
one image. But as this is a testing format and only for conformance testing,
that should not be an issue?

-- 
-------------
Gautam |