[Live-devel] How to get the time_scale value from H264/RTSP stream

[Sergio Andrés Basurco Mancisidor]

Hi Ross,
Thanks for your reply.
Indeed I am using Live555 as the RTSP client side, and I'm able to connect
and receive the NAL units and the sps-pps information from the camera.

Maybe you're right and my issue is completely on the decoding side, as I'm
failing to find the timestamp values that will allow me to playback the
stream.

Specifically, I receive a "presentationTimestamp" from Live555 together
with the NAL unit. I am not certain on how to use it in order to
synchronize playback.

Let me ask you, do you know about the RTP payload for H264? From what I can
tell there's a relationship between the 90kHz and the timestamps presented
by Live's RTSP client. Is 90kHz the time scale for those timestamps? And
how do those timestamps relate to the encoded stream?

I understand these questions may fall out of the library's scope. In any
case, thank you very much.

El jue., 28 sept. 2017 a las 23:01, Ross Finlayson (<finlayson at live555.com>)
escribió:

> > My goal is to play an H264 stream that comes from a camera. I am
> decoding using libav.
>
> Unfortunately your question wasn’t particularly clear.
>
> Could you clarify exactly how you are using the “LIVE555 Streaming Media”
> software?  Are you developing a RTSP client application (e.g., similar to
> “testRTSPClient”)?  If so, I assume you’ve read
>
> http://live555.com/liveMedia/faq.html#testRTSPClient-how-to-decode-data
> and note, in particular, the paragraph about H.264 video.
>
> We can’t really help you much with “libav” (as that’s not our software),
> except to note that the H.264 NAL units that you get from our RTSP client
> code - along with the SPS/PPS NAL units - should be sufficient to decode
> your video stream.
>
> If you have any further questions, please let us know.
>
>
> Ross Finlayson
> Live Networks, Inc.
> http://www.live555.com/
>
>
> _______________________________________________
> live-devel mailing list
> live-devel at lists.live555.com
> http://lists.live555.com/mailman/listinfo/live-devel
>
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