[FFmpeg-soc] Support for JPEG 2000 image files

[Peter B.]

Thanks for the tip!

I must admit that I haven't focused on JPEG-LS, because according to
information about it I've found on the web, it seemed that JPEG-LS is
less known/supported/used than JPEG 2000.

Theoretically it seems a valuable alternative to JPEG 2000 by offering
faster processing and better compression [1] in many cases, but there
are some issues that I'd have to evaluate about JPEG-LS:

- lack of applications/tools that support it (e.g. ImageMagick can't do
JPEG-LS [2])
- partial data retrieval for thumbnail previews (possible with JPEG-LS?)

For a long-term archive it is important to use open standards that are
as widespread as possible. I was even surprised that given the age of
JPEG 2000 it's still not supported as seamlessly as I'd expected. :(


However, I'll reconsider JPEG-LS in my evaluation, because processing
performance is still a major issue in this project. According to FFmpeg
documentation [3][4], it is already supported as image format.

Thanks,
Pb


[1] http://www.jpeg.org/public/wg1n1816.pdf
[2] http://www.imagemagick.org/script/formats.php
[3] http://ffmpeg.org/general.html#SEC5
[4] http://ffmpeg.org/changelog.html

Michael Niedermayer wrote:
> jpeg2000 is a poor choice as lossless codec, there are better ones like
> jpeg-LS which is simpler and has better performance
>