RTP payloaders and streaming over UDP/TCP

[distran]

Hello.

I am trying to stream a video over UDP. The format is not chosen yet (I want
to compare different formats and codecs). I am stuck on evaluations Theora
codec. The problem is connected with the fact that maximum payload of UDP
packet is 65535 (0xffff). From the pipeline below I am getting packets that
are larger, therefore cannot be sent over UDP.

The pipeline is the following:


it's simplified version:

I am getting an error from rtptheorapay, saying:



I was getting similar error when I was trying to send directly jpg frames
(MJPG) over UDP, using pipeline:


but in that case using correct payloader helped. The pipeline below behaves
correctly:


I am intentionally using snow pattern, which, as far as I understand coding
theory, is the worst case scenario for codecs, which base on sending deltas
(differences) between consecutive frames.

It seems that Theora payloader (rtptheorapay) is not able to encode one
Theora frame into multiple UDP packets. Is there a way to fix it? Maybe I
should use another element? I have no issue like that using other codecs,
such as H264 or VP8. I assume that image resulting from compression should
be more or less similar in all cases, cause there are not many ways to
compress random picture. However, all the other payloaders are able to
successfully map all the frames into UDP packets. Is there something I am
missing using theora codec? How can I fix that issue? I know I could
compress the stream so that frames fit into UDP packets (the same issue
exists when streaming over TCP). Is it possible to stream if I want to avoid
compressing the stream?

Thanks for any help.

Best regards,
Michal




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