GStreamer JPEG 2000 Workflows

[Aaron Boxer]

On Mon, Jun 27, 2016 at 5:22 AM, Miloš Selečéni <
milos.seleceni at comprimato.com> wrote:

> Hi Aaron, thanks for your work on improve J2K support inside GStreamer. I
> like to see that Jpeg2000 become more and more popular.
> We use Gstreamer mainly for transcoding e.g H246 -> some J2K container
> like MPEG-TS or MXF and also for streaming MPEG-TS over RTP protocol
>

Thanks, interesting. Are you using RTP for MPEG-TS because the MPEG-TS
muxer does not support J2K ?

>
> There are some features we like to have in MPEG-TS like support for
> J2K(which I'm working on) or support for NULL packets in MPEG-TS which is
> good for constant bitrate when you are streaming ...
>

Interesting. Perhaps we can combine our efforts on the MPEG-TS J2K support.

Aaron


>
>
> On Mon, Jun 27, 2016 at 9:43 AM, Sebastian Dröge <
> sebastian at centricular.com> wrote:
>
>> On So, 2016-06-26 at 09:46 -0400, Aaron Boxer wrote:
>> > Ni Nicola,
>> >
>> > Thanks for running these experiments - I didn't know about the timing
>> feature in gstreamer.
>> > It is interesting that openjpeg 2.1 is about 3 times slower than
>> openjpeg 1.5. Since the core
>> > encoding is not that different between the versions, the only
>> explanation I can think of
>> > is that the test source is monochrome, and openjpeg 2.1 encoder is
>> treating it as RGB or YUV.
>> > I will definitely take a look.
>>
>> OpenJPEG 2.1 has a different API that is less efficient to use for
>> GStreamer. More copying is going on, but I can't remember details.
>>
>> IIRC I told you about that a few weeks ago on this list already :)
>>
>> --
>>
>> Sebastian Dröge, Centricular Ltd · http://www.centricular.com
>>
>> _______________________________________________
>> gstreamer-devel mailing list
>> gstreamer-devel at lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>
>>
>
>
> --
>
> *Miloš Selečéni*
>
> *GPU Developer | Comprimato Systems s.r.o.*
>
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>
>
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