[Live-devel] New LIVE555 version, now supports 'trick play' on H.264 Transport Stream files

[BONNEAU Guy]

Ross,

I am not sure if this has been already done but can I suggest that you scale the timer resolution of the testOnDemandRTSP application to 1 ms . This would help to lower the jitter of the RTP packets sent. Under Windows you can use TimeBeginPeriod(1) to do this. With Linux I guess there must me a mean to do it. I have been able to fix cases similar to the one described about VLC when streaming Mpeg2 TS with testOnDemandRTSP by lowering the timer resolution.

http://www.mail-archive.com/live-devel@lists.live555.com/msg05507.html

GB

|-----Original Message-----
|From: live-devel-bounces at ns.live555.com [mailto:live-devel-
|bounces at ns.live555.com] On Behalf Of Ross Finlayson
|Sent: Wednesday, January 5, 2011 12:02
|To: LIVE555 Streaming Media - development & use
|Subject: Re: [Live-devel] New LIVE555 version, now supports 'trick play' on
|H.264 Transport Stream files
|
|(Note that this particular problem has nothing to do with 'trick play'; your
|streaming problem happens even if no index file is created.  It probably also
|doesn't have anything specifically to do with H.264 (see below).)
|
|Problems like this (VLC being able to play a file OK, but 'stuttering' if the same
|file is streamed from our RTSP server) are usually caused by a problem with
|the PCR timestamps in the file.
|(The server's "MPEG2TransportStreamFramer" object - which regulates the
|rate at which the data is output - uses the file's PCR timestamps to dynamically
|compute an estimate of the 'duration' of each Transport Stream packet, which
|in turn is used by the server to dynamically compute the rate at which data
|should be sent.)
|
|I suspect that perhaps your file is highly 'VBR' (variable bit rate), and the PCR
|timestamps are not occurring in the file frequently enough for our
|"MPEG2TransportStreamFramer" to properly adapt to it.
|--
|
|Ross Finlayson
|Live Networks, Inc.
|http://www.live555.com/
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