Lip sync problem on recording

gloomyandy · 2006-12-11, 00:48

Hi,
I have a question about a problem I'm seeing. From time to time I see two types of problems with lip sync when watching tv. All of this is with a dvb-t source using Hauppauge hardware (I have a HVR-1300 card and a Nova T Stick), and with the latest and recent svn builds...

1. Sometimes when I turn on live tv. The picture turns on and the sound is in sync. Then almost straight away there is a major stutter and then things carry on, however now the sound is out of sync. Switching channels usually fixes this.

2. From time to time I have recordings which also have lip sync problems. But this time there seems to be no way to get rid of it (I think it is in the recording). Stopping an starting does not work and no matter what I do the problem seems to always be there.

So the questions...

1. Does anyone else see these issues?
2. For problem 2 is this anything to do with mp? I thought that when recording from a dvb-t source mp simply grabbed the stream (with both the video and audio in it), if this is the case I don't really see how mp could be introducing the problem...
3. Would the new TV server have any impact on these types of problem? I don't think I can switch yet because I like to use powerscheduler and other stuff, but maybe it would be worth a try!

All the best

Andy

Marcusb · 2006-12-11, 04:18

In almost every case of TV Sync issues, the answer is to change the sound processor to "Default DirectSound Device".
It used to be only possible to do this in MP/Settings/TV but now you can also do it in the TV section of MP config.

Spragleknas · 2006-12-11, 13:20

Why is there even an option for other renderers in TV? Anybody using somthing else? If so; what are the benefits?

gloomyandy · 2006-12-12, 04:01

Hi Folks,
Thanks for the replies. I already had my audio render device set to he default direct show device. Any other thoughts? My system has a realtek sound device anyone know of any current issues with these?

Andy

Spragleknas · 2006-12-12, 10:16

Try using the template for support.

If you had posted this in the right place, it would automaticaly appear.

Try: http://forum.team-mediaportal.com/general-support-51/

gloomyandy · 2006-12-12, 13:37

Hi,
Thanks for the pointer. I'm not really looking for a "fix" for these problems as such. The problems I've been seeing have been with recent svns and I'm trying to narrow things down before posting a problem report in the quality control forum. I was more looking for some background information before posting that. In particular I wanted to understand if it is possible/likely for the streams in a recording to get out of sync or if they are effectively bound together as part of the broadcast stream. The sync problems I see with recorded shows is 100% reproducible (and moving the file to other systems and playing it with WMP I see the same problem) so I'm pretty sure the sync problem is in the recorded file. Also I'm aware that there is a lot of development going on with the new TV server and wanted to get a feel for how this may impact these sorts of issues.

Andy

Vasek · 2006-12-13, 10:43

Hi Andy,
I'm new to MP with very similar HTPC (hauppage 1300, Realtek audio). I've got similar problems with analog signal (we don't have DVB-T yet), however haupp1300 has hardware encoder, so it should do the same job as you questioned. Stuting vanished when I even for a short while pause the live tv (timeshift), however it not good solution. Do you have something new after these months? My idea is that MP is running video little bit faster then it is recieved and after some time there is nothing to play, so it starts to stut and looses sound.

gloomyandy · 2006-12-13, 22:40

Hi Vasek,
Thanks for the info. I'm afraid I have no solution for you but what you are seeing does sound similar o the problems have been seeing. Could I ask you for more details? For me what happens is that when I turn on the TV the channel is tuned in fine and the video and sound is in sync. Then after a few seconds there is a cople od stutters, after that the video and sound play ok (no more stutters), however they are not in sync. Is this what happens for you? I can fix the problem either by changing channels (which I guess would not make any difference for you), or by pausing the live tv, for a very short time. After that everything is fine, even if I skip forward to get back to "real time" the sound and video continue to be in sync.

All the best

Andy

Vasek · 2006-12-14, 08:41

Hi,
yes, it's very similar to yours case, the only difference I'm not loosing sync, just stutter goes worse and worse. Pausing also helps.
On Tuesday I reinstalled whole Windows because of some driver problems and BSOD. Yesterday I tried to run the TV whole night (I went to sleep however :=)) and today in the morning it was OK. So I don't know... I will come back if I have something new.
Because of MP requiring admin rights for timeshifting I'd like to try TV server (running as the service it could have admin right even when user has limited rights). TV server could also influence this problem.

Good luck!

Vasek

2006-12-11, 00:48	#1 (permalink)
gloomyandy MP Donator Join Date: Sep 2006 Age: 47 Posts: 261 Thanks: 1 Thanked 3 Times in 3 Posts Country: My System	Lip sync problem on recording Hi, I have a question about a problem I'm seeing. From time to time I see two types of problems with lip sync when watching tv. All of this is with a dvb-t source using Hauppauge hardware (I have a HVR-1300 card and a Nova T Stick), and with the latest and recent svn builds... 1. Sometimes when I turn on live tv. The picture turns on and the sound is in sync. Then almost straight away there is a major stutter and then things carry on, however now the sound is out of sync. Switching channels usually fixes this. 2. From time to time I have recordings which also have lip sync problems. But this time there seems to be no way to get rid of it (I think it is in the recording). Stopping an starting does not work and no matter what I do the problem seems to always be there. So the questions... 1. Does anyone else see these issues? 2. For problem 2 is this anything to do with mp? I thought that when recording from a dvb-t source mp simply grabbed the stream (with both the video and audio in it), if this is the case I don't really see how mp could be introducing the problem... 3. Would the new TV server have any impact on these types of problem? I don't think I can switch yet because I like to use powerscheduler and other stuff, but maybe it would be worth a try! All the best Andy

2006-12-11, 13:20	#3 (permalink)
Spragleknas Super Moderator Join Date: Dec 2005 Location: Rogaland Age: 32 Posts: 3,813 Thanks: 179 Thanked 90 Times in 76 Posts Country: My System	Why is there even an option for other renderers in TV? Anybody using somthing else? If so; what are the benefits? __________________ Please read -> HOW TO START A SUPPORT THREAD !!! Support MediaPortal! Donate by clicking HERE Dedicated HTPC board (Norway) -> MSPC.no

2006-12-12, 10:16	#5 (permalink)
Spragleknas Super Moderator Join Date: Dec 2005 Location: Rogaland Age: 32 Posts: 3,813 Thanks: 179 Thanked 90 Times in 76 Posts Country: My System	Try using the template for support. If you had posted this in the right place, it would automaticaly appear. Try: http://forum.team-mediaportal.com/general-support-51/ __________________ Please read -> HOW TO START A SUPPORT THREAD !!! Support MediaPortal! Donate by clicking HERE Dedicated HTPC board (Norway) -> MSPC.no

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2006-12-11, 04:18	#2 (permalink)
Marcusb Super Moderator Join Date: Feb 2005 Location: Melbourne Posts: 1,932 Thanks: 67 Thanked 28 Times in 28 Posts Country: My System	In almost every case of TV Sync issues, the answer is to change the sound processor to "Default DirectSound Device". It used to be only possible to do this in MP/Settings/TV but now you can also do it in the TV section of MP config.

2006-12-12, 04:01	#4 (permalink)
gloomyandy MP Donator Join Date: Sep 2006 Age: 47 Posts: 261 Thanks: 1 Thanked 3 Times in 3 Posts Country: My System	Hi Folks, Thanks for the replies. I already had my audio render device set to he default direct show device. Any other thoughts? My system has a realtek sound device anyone know of any current issues with these? Andy

2006-12-12, 13:37	#6 (permalink)
gloomyandy MP Donator Join Date: Sep 2006 Age: 47 Posts: 261 Thanks: 1 Thanked 3 Times in 3 Posts Country: My System	Hi, Thanks for the pointer. I'm not really looking for a "fix" for these problems as such. The problems I've been seeing have been with recent svns and I'm trying to narrow things down before posting a problem report in the quality control forum. I was more looking for some background information before posting that. In particular I wanted to understand if it is possible/likely for the streams in a recording to get out of sync or if they are effectively bound together as part of the broadcast stream. The sync problems I see with recorded shows is 100% reproducible (and moving the file to other systems and playing it with WMP I see the same problem) so I'm pretty sure the sync problem is in the recorded file. Also I'm aware that there is a lot of development going on with the new TV server and wanted to get a feel for how this may impact these sorts of issues. Andy

2006-12-13, 10:43	#7 (permalink)
Vasek Portal Member Join Date: Dec 2006 Location: Liberec Age: 32 Posts: 27 Thanks: 0 Thanked 0 Times in 0 Posts Country: My System	Hi Andy, I'm new to MP with very similar HTPC (hauppage 1300, Realtek audio). I've got similar problems with analog signal (we don't have DVB-T yet), however haupp1300 has hardware encoder, so it should do the same job as you questioned. Stuting vanished when I even for a short while pause the live tv (timeshift), however it not good solution. Do you have something new after these months? My idea is that MP is running video little bit faster then it is recieved and after some time there is nothing to play, so it starts to stut and looses sound.

2006-12-13, 22:40	#8 (permalink)
gloomyandy MP Donator Join Date: Sep 2006 Age: 47 Posts: 261 Thanks: 1 Thanked 3 Times in 3 Posts Country: My System	Hi Vasek, Thanks for the info. I'm afraid I have no solution for you but what you are seeing does sound similar o the problems have been seeing. Could I ask you for more details? For me what happens is that when I turn on the TV the channel is tuned in fine and the video and sound is in sync. Then after a few seconds there is a cople od stutters, after that the video and sound play ok (no more stutters), however they are not in sync. Is this what happens for you? I can fix the problem either by changing channels (which I guess would not make any difference for you), or by pausing the live tv, for a very short time. After that everything is fine, even if I skip forward to get back to "real time" the sound and video continue to be in sync. All the best Andy

2006-12-14, 08:41	#9 (permalink)
Vasek Portal Member Join Date: Dec 2006 Location: Liberec Age: 32 Posts: 27 Thanks: 0 Thanked 0 Times in 0 Posts Country: My System	Hi, yes, it's very similar to yours case, the only difference I'm not loosing sync, just stutter goes worse and worse. Pausing also helps. On Tuesday I reinstalled whole Windows because of some driver problems and BSOD. Yesterday I tried to run the TV whole night (I went to sleep however :=)) and today in the morning it was OK. So I don't know... I will come back if I have something new. Because of MP requiring admin rights for timeshifting I'd like to try TV server (running as the service it could have admin right even when user has limited rights). TV server could also influence this problem. Good luck! Vasek