[Live-devel] Maximum interleaved RTP packet size

[Deanna Earley]

In testing, the limit seems to be 20000 bytes (which matches RTSPClient::responseBufferSize but increasing them both in sync doesn't work)

I'd rather not hard code a header string in the liveMedia code so is there any nice mechanism to be able to pass additional headers in the RTSP request?
I can't see one, and if not, would you be open to patches that implement this?

Thanks

-- 
Deanna Earley | Lead developer | icatchercctv

w: www.icode.co.uk/icatcher | t: 01329 835335 | f: 01329 835338
Registered Office : 71 The Hundred, Romsey, SO51 8BZ. Company Number : 03428325

> -----Original Message-----
> From: live-devel [mailto:live-devel-bounces at ns.live555.com] On Behalf Of
> Deanna Earley
> Sent: 15 April 2015 11:15
> To: 'live-devel at lists.live555.com'
> Subject: [Live-devel] Maximum interleaved RTP packet size
> 
> Hello Ross.
> 
> We have an open case with one of our RTSP source vendors where RTP streams
> over interleaved TCP seem to be throttled resulting in dropped frames in
> situations where the camera increases the frame size.
> This does not happen with UDP unicast.
> For reference, here's the video explaining the issue to the vendor:
> https://dl.dropboxusercontent.com/u/2931731/Bugs/Axis/501898/20150325_1011
> 55.mp4
> 
> The vendor's response suggests it could be a TCP flow control issue and
> that we can pass a value to increase the RTP packets:
> "If using unicast in combination with TCP, it is recommended to increase
> the size of the RTP packets to 64 000 bytes (from the standard 1500
> bytes), provided that the client can accept larger packets."
> Is there a specific upper limit to the packet size that liveMedia's
> interleaved TCP implementation can handle?
> 
> I'm aware that UDP is preferred, but we do allow the use of TCP to allow
> for better firewall traversal.
> (We are discussing internally changing the default to UDP)
> 
> Thanks
> 
> --
> Deanna Earley | Lead developer | icatchercctv
> 
> w: www.icode.co.uk/icatcher | t: 01329 835335 | f: 01329 835338
> Registered Office : 71 The Hundred, Romsey, SO51 8BZ. Company Number :
> 03428325
> 
> 
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