Dear Sir,
How to set H264 and aac live frame timestamp ?
I use live555 to do rtsp server from my h264/aac live stream.
First, I know every frame about timestamp and frame len from two linux fifo.
And I use ByteStreamFileSource.cpp and ADTSAudioFileSource.cpp to get the frame
data.
For h264/aac sync, I use testProgs/testOnDemandRTSPServer.cpp to do:
ServerMediaSession* sms
= ServerMediaSession::createNew(*env, streamName, streamName,
descriptionString);
sms->addSubsession(H264VideoFileServerMediaSubsession
::createNew(*env, inputFileName, reuseFirstSource));
sms->addSubsession(ADTSAudioFileServerMediaSubsession
::createNew(*env, inputFileName3, reuseFirstSource));
Everything is good, but I use vlc to play only 30 minutes， then it's broken.
The vlc debug message is:
avcodec error: more than 5 seconds of late video -> dropping frame (computer
too slow ?)
main warning: picture is too late to be displayed (missing 656606 ms)
main warning: picture is too late to be displayed (missing 656602 ms)
main warning: picture is too late to be displayed (missing 656598 ms)
main warning: picture is too late to be displayed (missing 656262 ms)
main warning: picture is too late to be displayed (missing 656298 ms)
I found that the timestamp code in ByteStreamFileSource.cpp is this:
// Set the 'presentation time':
if (fPlayTimePerFrame > 0 && fPreferredFrameSize > 0) {
if (fPresentationTime.tv_sec == 0 && fPresentationTime.tv_usec == 0) {
// This is the first frame, so use the current time:
gettimeofday(&fPresentationTime, NULL);
} else {
// Increment by the play time of the previous data:
unsigned uSeconds = fPresentationTime.tv_usec + fLastPlayTime;
fPresentationTime.tv_sec += uSeconds/1000000;
fPresentationTime.tv_usec = uSeconds%1000000;
}
// Remember the play time of this data:
fLastPlayTime = (fPlayTimePerFrame*fFrameSize)/fPreferredFrameSize;
fDurationInMicroseconds = fLastPlayTime;
} else {
// We don't know a specific play time duration for this data,
// so just record the current time as being the 'presentation time':
gettimeofday(&fPresentationTime, NULL);
}
And I check the timestamp in liveMedia/H264VideoStreamFramer.cpp, the true
timestamp is this:
// Note that the presentation time for the next NAL unit will be different:
struct timeval& nextPT = usingSource()->fNextPresentationTime; // alias
nextPT = usingSource()->fPresentationTime;
double nextFraction = nextPT.tv_usec/1000000.0 + 1/usingSource()->fFrameRate;
unsigned nextSecsIncrement = (long)nextFraction;
nextPT.tv_sec += (long)nextSecsIncrement;
nextPT.tv_usec = (long)((nextFraction - nextSecsIncrement)*1000000);
It's use framerate to get timestamp.
So, if I set the ture video timestamp "nextPT.tv_sec and nextPT.tv_usec".
There is anything that I missing ? I found that if I change this, the same
problem.
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