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Posted by Pat Horridge on 10/29/07 16:54
Soory I hadn't realised you had the issue with the recorded file.
How did you record it?
If the file came in in sync but plays back wrong after being recorded I'd
have to suspect soemthig wrong either with the lcal palyback of that file or
it was recorded wrong in the first place.
<bobby_yan@msn.com> wrote in message
news:1193539368.813642.50090@q5g2000prf.googlegroups.com...
On 10 24 , 5 17 , "Pat Horridge" <p...@remove-spam.vet.co.uk> wrote:
> I think Quicktime isn't too hot on Audio video sync. If the FPS for the
> video is too high for the data connection to sustain the video and audio
> will start to drift out of sync. Lowering the video to half the fps would
> probably solve the problem.
> You would have to re-encode the video at a lower fps rate to achieve that.
>
> "" <bobby_...@msn.com> wrote in message
>
> news:1192621803.966362.113480@v29g2000prd.googlegroups.com...
>
>
>
> >I have recorded .mov file form rtsp://202.38.70.248/2003sjh/20030901.mov
> > using Mov Recorder 1.3. The audio is ahead of video in the recorded
> > file. The amount of advanced time is negligible at the beginning of
> > the file, but increases gradually as we go forward, and reaches the
> > maximum at the tail of the file. I also observe the fps (Frames Per
> > Second) of the file by Quicktime 7.2. When playing the rtsp stream
> > directly on the Internet, the fps is 25.00. While the fps becomes 24
> > in the recorded file. Moreover, compared to the rtsp stream, the last
> > part of the video in the recorded file is lost, while the audio is
> > complete. I guess the change of the fps is the causation.
> > Is there any possible solution to this? Maybe modifying the fps of the
> > recorded file is one, but I don't know how to. Thank you.- -
>
> - -
But the Audio-Video sync is perfect when I playing the rtsp stream on
the Internet, and I think the network is good enought to sustain the
playback. The loss of synchronization only occurs in the recorded
file. You mean re-encode the recorded file may solve problem? Would
you please explain the reason? Thank you.
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