[FFmpeg-devel] libopenjpeg decoder not correctly setting the pixel format for cinema JP2K wrapped MXF

[Rémi Achard]

> Please elaborate!

Sure, here are some comparisons I just made, please note the huge
difference in speed between current master and n4.0 that I picked as a
representative of the state of the decoder back then.

There are great improvements being made for sure, I still think there could
be some benefit having the libopenjpeg decoder work out of the box for
cinema j2k (one of the big user of that format probably).

libopenjpeg (master)
frame=   96 fps= 14 q=-0.0 Lsize=   59514kB time=00:00:01.97
bitrate=246323.9kbits/s speed=0.279x
jpeg2000 (master)
frame=   96 fps=8.8 q=-0.0 Lsize=   70102kB time=00:00:01.97
bitrate=290149.4kbits/s speed=0.182x
jpeg2000 (n4.0)
frame=   50 fps=3.0 q=-0.0 Lsize=   36176kB time=00:00:01.02
bitrate=290281.1kbits/s dup=0 drop=46 speed=0.0605x

Le mar. 1 sept. 2020 à 18:39, Carl Eugen Hoyos <ceffmpeg at gmail.com> a
écrit :

> Am Di., 1. Sept. 2020 um 19:32 Uhr schrieb Rémi Achard <
> remiachard at gmail.com>:
>
> > We can use the native decoder yes, not sure what the state is right now
> > though, because I heard that some work was ongoing on that decoder, but
> > back then (approx. 1 year ago) it was not really an option due to its
> poor
> > performance, even for offline jobs.
>
> Please elaborate!
>
> Carl Eugen
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