[Live-devel] Why H264 annexB bytestream transported incompletely?

[Andreas Färber]

Hello,

Am 28.03.2008 um 09:15 schrieb Felix:

>    I have been trying to stream H264 annexB bytestream with  
> livemedia, and have made little progress these days.
>    My own xH264VideoStreamFramer(subclass of H264VideoStreamFramer)  
> and H264VideoFileServerMediaSubsession have been done.
>
>    To check my classes, I modified live555MediaServer, and use it as  
> the server while openRTSP as client for test.
>
>    But when running, the bytestream cannot be transported  
> completely. Only the first few datas can be received. What puzzles  
> me more is that the amount of datas received is variational.
>    The size of  H264 annexB bytestream file on the server is 70574  
> Bytes, sometimes the receiver can only receive the first 48KB, or  
> sometimes 68KB. 70574B can rarely been received completely.
>
>    I also compare the data received on client with the bytestream  
> file on the serever, and found that these data are just the first  
> part of the bytestream.

I have been working on a H.264 annex G video stream framer. For me,  
the last access unit is not being transmitted, and I attribute this to  
my file parsing code, which by nature of the live library does not  
recognize the end of the file properly and therefore does not reach/ 
mark the end of the last access unit.

Regards,

Andreas

>    I checked the "fOctetCount" member of class "RTPSink", and found  
> that when "MultiFramedRTPSink" call its "onSourceClosure()" function,
>    live555MediaServer already sent 70574 Bytes to the  
> client(openRTSP). But on the client, the data received is incomplete  
> and variational.
>
>    What might caused this problem?
>
>    Any help will be appreciated!
>
> Best Regards
> Felix
>
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