[Live-devel] How to sync H264 and AAC timestamp from live streaming

[Eric_Hsieh at alphanetworks.com]

Hi Ross,

Thanks for quickly response.
1. We are very sure the fPresentationTime are accurate.
    We guess the video block issue. It will happen heavy video bitrate on low upload bandwidth.
    So, does live555 support flow control?
2. Yesterday, we set up a VGA at 1fps MJPEG to do streaming.
    It works well, I guess this issue is same with Item1.
    We need to do some flow control.

Thanks a lot.

regards, eric, 10/07

On Oct 6, 2015, at 20:32, Ross Finlayson <finlayson at live555.com<mailto:finlayson at live555.com>> wrote:

Now, we use H264VideoStreamDiscreteFramer to do live streaming, it is better than before.
And we sure the timestamp is correct and sync with “wall clock time”.
But, we still have some questions, need your help.
1. Now, H264+AAC is working well.
    After playing about 3 hours, audio is good but video will not very smooth to play.
    Do you have any suggestions?

Are you absolutely sure that your “fPresentationTime” values - for both audio and video - remain accurate even after 3 hours?  (In particular, watch out for accumulated truncation errors.)

If you’re sure that your “fPresentationTime”s are accurate, then sorry, I don’t have any other suggestion; perhaps the problem is with your client application?

2. We still need to stream JPEG+AAC live streaming.
    After playing 2 minutes, video will block which is same with H264+AAC issue.
    There is no DiscreteFramer class for JPEG streaming, do you have any suggestions?

Yes - my suggestion is not to stream JPEG; it’s a bad idea.  See:
http://live555.com/liveMedia/faq.html#jpeg-streaming


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

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