Old 2nd November 2007, 08:45   #1
Joren
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Shoutcast TV A/V sync issues...

Hello... so... I've been trying to troubleshoot some audio/video sync issues that occur whenever I try to listen to an online stream using Winamp, and I have finally gotten frustrated enough to attempt to ask for help . Here's the problem: When I connect to Shoutcast TV and try to play any of the streams listed there, the sound and video will synch up perfectly for the first song/segment. As soon as the track changes, audio will be off by a second or so. It gets worse the longer it goes.

This issue has existed for me basically all along the 5.0 line of Winamp. I've tried increasing buffers in the NSV plugin, turning off fading for DirectSound, switching to WaveOut, increasing buffers for those too, etc. My most recent attempt was to completely clear out the old Winamp and try installing the new 5.5.

I should note that with the new 5.5 install the video wouldn't even play longer than a second until I increased the buffer significantly above the default settings. It seemed kind of odd and I wondered whether it might be related...seemed to be rebuffering all the time until I set the buffer to 20/30 seconds.

Also, my Internet tube is cable, 3 mbps or so...it's never had any problem keeping up with streams...just with keeping them in sync

I'm running a Dell laptop (e1705)
- Core Duo T2250
- 2 GB of RAM. I can throw as much memory at Winamp as I want.
- Soundcard is the onboard SigmaTel kitsch that comes with it (I had a SoundBlaster Audigy Notebook Edition but I got annoyed with it's own set of issues so I reverted back to SigmaTel).
- Video is nVidia Go 7900 GS with 256 MB of memory
- Windows XP Media Center Edition, Service Pack 2
- DirectX 9.0c
- Winamp 5.5 Full
- This is clean and I haven't tried installing any plugins. Did check the Winamp Remote during the installer though.



Any more details that I should have thought to include?

(I've got this nagging feeling that there's some FAQ entry with something incredibly obvious like "how to fix A/V sync issues" that I missed when I was searching the forums... :P)

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Old 3rd November 2007, 05:35   #2
Joren
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*bump*

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Old 4th November 2007, 08:58   #3
siebe83
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Hi,

Not sure about this one. A forums search turned up these threads:

http://forums.winamp.com/showthread.php?threadid=256175
http://forums.winamp.com/showthread.php?threadid=254181
http://forums.winamp.com/showthread.php?threadid=250028
http://forums.winamp.com/showthread.php?threadid=242436
http://forums.winamp.com/showthread.php?threadid=180770

The replies suggest to me that this is a broadcast issue, and that there isn't much you as a listener can do.
(note that some of the threads above take the perspective of the broadcaster, so it gets a little technical here and there)

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Old 22nd November 2007, 03:48   #4
Joren
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Not the Server After All

Thank you for the links - however, I am pretty sure it is not server side. Sorry for waiting so long to reply - I had to let this rest a while b/c of school, but now I went and got VLC and compared it side by side with Winamp. I had noticed that VLC seems to play it back flawlessly but unfortunately crashes after several tracks

Side by side, playing the same video Shoutcast stream, I noticed a couple things:

1. When the current video is finished playing and the server loads the next one, a/v on Winamp goes out of sync.

2. When playing VLC and Winamp side by side, if you can get the audio synchronized between VLC and Winamp, then the following will happen when the video is finished and the next one plays: The sound will stay synchronized between VLC and Winamp, but the video on Winamp's side appears earlier than VLC's. Winamp's video appears to be rushing ahead, whereas VLC's does not.

I reviewed one of the threads which stated that for Winamp, a/v going out of sync is unavoidable when other tasks are running. I am running a Core Duo machine on which Winamp uses less than 10% of the CPU. Nothing else is running (except in the test case, VLC of course )


So yes, I do unfortunately believe that this is a Winamp problem based on what we have so far. I have tried this with multiple streams. I suppose it could be that VLC is doing some fact-checking to remedy something wrong on the server side but I wish Winamp would too

Tweaking buffer or fade settings seems to do nothing to change this...any additional tweaks/advice I can try? This is really sad b/c Winamp's my favorite player and I really want to be able to use it for Shoutcast video watching, since VLC isn't very stable for me

Thanks again for your time,
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Old 3rd December 2007, 00:56   #5
Joren
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*bump*

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