[vlc] Re: choosing play time from rtp/rtcp timestamp

[Antoine Bardel]

Hi Beni,

Sorry I cannot answer your question. But I would like to ask you one :
Which RTCP server are you using ?
(I'm trying to put RTCP features in the vlc server, if you know a
little more about it...)
thanks.


On 5/12/05, Beni Mahler <benibunny at gmx.net> wrote:
> hello all
> 
> i am engineering student working with audio synchronisation of multiple
> pc's within a LAN. I would like to play back one multicast stream on
> different machines who are within audible distance. they all need to
> play back the stream in +/- 0.05 seconds from each other. Therefore I
> thought of sending an RTP/RTCP Stream from a server, and then connect to
> the stream using vlc, mplayer... interpreting the RTCP Timestamps to
> determine the wallclock time, when the data was generated. To be sure
> all stations play the sound synchronously, I wanted to add a 'fix'
> delay, e.g. 3sec to the time, when the packet was generated and to play
> it at this time. I have read in the vlc mailing list that the LIVE.COM
> code automatically uses the information in RTCP reports to convert these
> to accurate presentation times, BUT does vlc permit me, to set a fix
> delay between the ntp time when the packet was generated and the moment
> when it is played? i think vlc normally determines this delay depending
> on the network. i know that mplayer usually caches a number of bytes
> before playing.
> 
> cheers
> 
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