[Live-devel] Re: [vlc-devel] RTSP trickplay support

[Ross Finlayson]

At 11:24 AM 12/20/04, you wrote:
>On 20 dec 2004, at 19:00, Dermot McGahon wrote:
>>--- live/liveMedia/MediaSession.cpp     2004-12-15 08:31:10.000000000 +0000
>>+++ live.2004.12.15/liveMedia/MediaSession.cpp  2004-12-20 
>>17:56:23.307350100 +0000
>>@@ -631,6 +631,7 @@
>>      if (strcmp(fProtocolName, "UDP") == 0) {
>>        // A UDP-packetized stream (*not* a RTP stream)
>>        fReadSource = BasicUDPSource::createNew(env(), fRTPSocket);
>>+      fReadSource = MPEG2TransportStreamFramer::createNew(env(), 
>>fReadSource);
>>        fRTPSource = NULL; // Note!
>>      } else {
>>        // Check "fCodecName" against the set of codecs that we support,
>
>This isn't correct. You cannot assume that a UDP source is always MPEG2 
>TS. You will need to be sure that there is a MPEG2-TS stream.. ( 
>payloadtype 33)

No, Dermot's suggested patch was for handling a *raw* UDP stream, *not* a 
RTP/UDP stream.

It assumes, however, that all raw UDP streams are MPEG Transport 
Streams.  Is this likely to be the case in practice?  If not, is there 
something in the SDP description that will indicate this?  (Does the SDP 
description for such streams still contain anything useful in the RTP 
payload format code field (on the "m=" line)?)


	Ross Finlayson
	LIVE.COM
	<http://www.live.com/>