[vlc] Re: How RTP timestamps are used by VLC

[Christophe Massiot]

At 21:10 +1100 1/02/05, Dennis Darcy & Kristy Suters wrote:

>How does VLC use rtp timestamps to present the mpeg-2 ts data to be decoded?

VLC doesn't use the RTP timestamps, so you must be mistaken. See 
modules/access/udp.c if you don't believe me.

>What I've notice is that when the rtp timestamp is set continuously 
>to zero, vlc is happy.
>But when rtp timestamps contain valid timing information based on a 
>32-bit 90kHz counter, vlc is not happy.
>Also I tried setting the upper 16-bits of the rtp timestamp to zero, 
>vlc was also happy with this.
>
>I also used Ethereal to verify that the rtp packet format was 
>correct and to check the difference of two packets was correct,
>hence the rtp timestamp difference was 49 (49 * 1/90k = 540us), for 
>a transport stream @ ~19Mbps a rtp packet was rx every 540us .
>
>I'm using vlc 0.8.1 on windows 2000.
>
>I would be grateful for any insight on how VLC uses RTP timestamps 
>before the a/v decoder.


-- 
Christophe Massiot.

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