[Live-devel] ONVIF support in Live555

[Matt Schuckmann]

We use MJPEG over RTP to send on demand hi resolution still images along 
side our video which is lower res H.264.
Is there an extension to the MJPEG standard that allows JPEG over 2k x 
2k? If so we'd be interested in implementing it.

Matt S.


Cristiano Belloni wrote:
> Ross Finlayson wrote:
>> Someday we will support RTP header extensions (though not necessarily 
>> this particular application of them (see above)).
>>
>> More generally, though, I'm curious about why people are still 
>> interested in JPEG-over-RTP, especially with very large JPEG images. 
>> JPEG is a *terrible* codec to use for video; it doesn't have any of 
>> the inter-frame prediction/compression features that real video 
>> codecs have.
> I know your opinion on this topic.
> The reason why people is still interested in JPEG streaming is that 
> hardware MPEG4 and H264 encoders often simply don't support higher 
> resolutions (for example, MPEG4 on TI DaVinci platforms is limited to 
> 1280x960, and H264 has a resolution limit that's only a tad higher), 
> while JPEG encoder often support resolutions of up to 10K x 10K pixel.
>
> So often, especially when you have to stream big frames, MJPEG is all 
> you have, and you got to live with it. That's why people still are 
> still interested in it (for sake of completeness there's another - 
> secondary - reason, i.e. retrocompatibility with older software).
>
> Regards,
> Cristiano.
>