> On Mar 22, 2021, at 12:00 PM, Thorson, Joshua C <joshua.thor...@gatech.edu>
> wrote:
>
> It seems to be an issue with the StreamParser, when it is ensuring valid
> bytes the number of bytes that are needed is only 1 but the UDP source is
> reading ~940 bytes. So, the if statement: fCurParserIndex + numBytesNeeded >
> BANK_SIZE never becomes true, thus never switching the parser banks. I fixed
> this issue by subclassing the BasicUDPSource and overriding the maxFrameSize
> function to something > ~940.
Thank you. You discovered a deficiency in the “BasicUDPSource” class that
prevented it from working properly with “StreamSource” subclasses. I have just
installed a new version (2021.03.22) of the code that fixes this, by having
“BasicUDPSource” reimplement the “maxFrameSize()” virtual function.
> With this now working I now need to figure out how to hookup the
> MPEG2TransportStreamDemux to the H264VideoRTPSink. I believe it should go
> something like this:
>
> MPEGTS Multicast Stream -----> BasicUDPSource ----->
> MPEG2TransportStreamDemux -----> H264VideoRTPSink
>
> However, I understand I don't have the ability to specify the sink for the
> various demuxed elementry streams. Is there any way this could be added or
> subclassed to allow such a thing?
Unfortunately the current “MPEG2TransportStreamDemux” class doesn’t make it
possible to do this - so I’ll need to redesign this class, in some future
version of the code. (Stay tuned.)
In the meantime, you can do the following:
Modify the “PIDState_STREAM()” constructor in
“MPEG2TransportStreamParser_STREAM.cpp” to set the “fileName” to “stdout”
(perhaps only if st.dataType == StreamType::VIDEO).
Then, if you want to stream via multicast, edit “testH264VideoStreamer.cpp” (in
“testProgs”) to change “inputFileName” to “stdin”, then run
yourDemuxerApplication | your-modified-testH264VideoStreamer
Alternatively, if you want to stream via unicast, then edit
“testOnDemandRTSPServer.cpp” (in “testProgs”) as follows:
- on line 32, change “reuseFirstSource” from “False” to “True”
- on line 101, change “inputFileName” to “stdin”
Then run
yourDemuxerApplication | your-modified-testOnDemandRTSPServer
Ross Finlayson
Live Networks, Inc.
http://www.live555.com/
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