[Live-devel] 答复: use livemedia transport mpeg4streame problem

[杨志祥]

thanks you answer.
1、i alreday use ""MPEG4VideoStreamDiscreteFramer" by ownserverseesion.
2、I test my devicesource class.when i set "fDurationInMicroseconds=0" or not set it.then use vlcplayer is very bad. if set 
fDurationInMicroseconds=1000000/25,then vlc player result better than "fDurationInMicroseconds=0". why?
 
3、I dont know 'where "frame_rate" is the stream's frame rate in frames-per-second'. it not 25 or 30?? if no,i how to get frame_rate value?
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From: live-devel-bounces at ns.live555.com 代表 Ross Finlayson
Sent: 2010-11-26 (星期五) 17:00
To: LIVE555 Streaming Media - development & use
Subject: Re: [Live-devel] use livemedia transport mpeg4streame problem



	thanks.if use the encode to file,the file use "testondemandrtpserver" tansport,VLC player is GOOD.(use i frame and p frame).


That's good news, because it shows that the data from your encoder is OK.  The only problem is the way that you are sending it.

Because your data comes from an encoder - one frame at a time - you should be feeding it into a "MPEG4VideoStreamDiscreteFramer" (*not* a "MPEG4VideoStreamFramer"), and from there into a "MPEG4ESVideoRTPSink".



	i have two question:
	 1?Ai look devicesource exsample,it say if use livesource,then "fDurationInMicroseconds" is no set.yes? if no,how to set it?


Because your encoded video data comes from a live source, you probably do not need to set "fDurationInMicroseconds" in your data source class.  (However, if you do choose to set it, you would set it to
        1000000.0/frame_rate
for each frame, where "frame_rate" is the stream's frame rate in frames-per-second.



	2?Awhatever livemeida receive is I frame and P frame,my owndevicesource deliverFrame use same gettimeofday(&fPresentationTime,NULL)


That should be OK.  Just be sure to feed this data into a "MPEG4VideoStreamDiscreteFramer", and the presentation time values will be adjusted properly, even for P frames.
-- 

Ross Finlayson
Live Networks, Inc.
http://www.live555.com/