> On Nov 4, 2019, at 5:08 AM, Ha Viet <[email protected]> wrote:
>
> I am using your live555 library to transmitting h264 streams from my server
> to clients.
> The server bases on OnDemandServerMediaSubsession and the client bases on
> testRTSPClient.
> Both of them work pretty well except one thing is: I do not know the way to
> make PTS of original
> stream preserved through the transmission.
Because of the way our server is implemented, you can’t do this. Instead, the
“fPresentationTime” values - used by our server when outputting data - must be
aligned with ‘wall clock’ time (i.e., the time that you would get by calling
“gettimeofday()”).
This does not mean that your server cannot use pre-recorded presentation time
stamps. You can do this; however, the *first* “fPresentationTime” must be
aligned with the time that you’d get by calling “gettimeofday()”. Thereafter,
you can just add a constant offset to your prerecorded presentation time
stamps. I.e., in pseudo-code:
- For the first “fPresentationTime”:
fPresentationTime = gettimeofday()
const ptsOffset = fPresentationTime - prerecordedPresentationTime[0]
- For subsequent “fPresentationTimes”:
fPresentationTime = prerecordedPresentationTime[N] + ptsOffset
Ross Finlayson
Live Networks, Inc.
http://www.live555.com/
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