On Mon, Jun 22, 2020 at 11:37 PM Gautam Ramakrishnan <gautamr...@gmail.com> wrote: > > On Mon, Jun 22, 2020 at 11:30 PM Carl Eugen Hoyos <ceffm...@gmail.com> wrote: > > > > Am Mo., 22. Juni 2020 um 19:40 Uhr schrieb Gautam Ramakrishnan > > <gautamr...@gmail.com>: > > > > > > On Mon, Jun 22, 2020 at 8:07 PM Carl Eugen Hoyos <ceffm...@gmail.com> > > > wrote: > > > > > > > > > > > > > > > > > Am 22.06.2020 um 12:42 schrieb Moritz Barsnick <barsn...@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 > > > > >> <ceffm...@gmail.com> wrote: > > > > >>>> Am 22.06.2020 um 07:32 schrieb Gautam Ramakrishnan > > > > >>>> <gautamr...@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@ffmpeg.org > > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel > > > > To unsubscribe, visit link above, or email > > ffmpeg-devel-requ...@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 |
Another issue is that as the .pgx format is tightly linked to JPEG2000, how could the format be restricted to conversions between j2k and jp2 files only? For example, the pgx header contains a field called signed, which indicates whether the component values are signed or unsigned. This seems very specific to jpeg2000 and would not probably allow conversion from pgx to other formats directly. -- ------------- Gautam | _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
