[Live-devel] Problems with Streaming of AMR

[Martin]

Hi Ross,

thank you for your help so far, I really appreciate it!

> Sorry - my mistake.  I had forgotten how the FFMPEG encoder works, 
> and what "AMRAudioRTPSink"s requirements are.  I had it all 
> backwards.  In fact, when delivering AMR frames to "AMRAudioRTPSink", 
> we *don't* want to include the 1-byte header in each frame (because 
> it instead gets included in a special RTP header).  However, the 
> FFMPEG encoder, by default, *does* include the 1-byte header in each 
> frame, so we had to change the FFMPEG code, and, in the code that 
> calls the FFMPEG code, do:
> 
> 	extern int EncoderIncludeHeaderByte;
> 	EncoderIncludeHeaderByte = 0;
> and, for each frame
> 	fLastFrameHeader = toc_byte[ourAMRMode];
> See "AMRAudioEncoder.cpp" in the "wis-streamer" code.
> 
> Note that the change that I made to FFMPEG's "interf_enc.c" means 
> that - by default - it works the same way as it did before (as you 
> noted).  It's only when the calling code sets
> 	EncoderIncludeHeaderByte = 0;
> that it behaves differently.
> 
> I hope that clears things up.

ok, that definitely cleared thinks up :)
Anyway, its still not working...I changed the ffmpeg code and included
fLastFrameHeader = toc_byte[ourAMRMode];
for every frame.

Is the frame header restored after streaming over RTP? If not, I suppose
ffmpeg expects the header in every frame and therefore the decoding is
not working...if that's the case, do you have an example code for this,
as well?


Martin