Is it possible to add video output delay to PC to fix audio sync?

Forums › Home Theatre (including HTPC and EPG Collector) › Is it possible to add video output delay to PC to fix audio sync?

hbk

94 posts

Master Geek

#46495 7-Nov-2009 08:39

Hi,

I have an HTPC running W7 MC, audio out goes to my old receiver which is adding a <100ms delay to the sound, it's only just noticable but annoying. Video goes directly from the HTPC to HDMI in on the TV.

Is there any way to add a delay to the video out from the PC to fix the sync? (Video can't go through the receiver, which would a better solution but that would require buying a new receiver which I didn't want to do yet).

Cheers

1gkar

722 posts

Ultimate Geek

#271716 10-Nov-2009 17:16

Can you add a delay to the audio? What codec are you using for sound? Some have an option to add delay. Don't think it's possible with video. Don't have W7, so can't comment further without facts.

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dolsen

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#271724 10-Nov-2009 17:30

1gkar: Can you add a delay to the audio?

I'm sure he could, however, that is the exact opposite of what he needs to fix his current problem. I'm not sure of any delay you can add to the video to make it sync up.
Is there a game mode on the tv perhaps?

1gkar

722 posts

Ultimate Geek

#271748 10-Nov-2009 17:55

dolsen:
1gkar: Can you add a delay to the audio?

I'm sure he could, however, that is the exact opposite of what he needs to fix his current problem. I'm not sure of any delay you can add to the video to make it sync up.
Is there a game mode on the tv perhaps?

What's the difference between adding 100ms of video delay, or subtracting 100ms of audio before it gets to the amp. Unless the amp is the issue which is adding variable delays & the audio delay cannot correct properly. If it is stable at around 100ms, I don't see why negative audio delay wouldn't work.

dolsen

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#271934 11-Nov-2009 09:27

1gkar:
dolsen:
1gkar: Can you add a delay to the audio?

I'm sure he could, however, that is the exact opposite of what he needs to fix his current problem. I'm not sure of any delay you can add to the video to make it sync up.
Is there a game mode on the tv perhaps?
What's the difference between adding 100ms of video delay, or subtracting 100ms of audio before it gets to the amp. Unless the amp is the issue which is adding variable delays & the audio delay cannot correct properly. If it is stable at around 100ms, I don't see why negative audio delay wouldn't work.

By the sounds of it, he has 1 audio going to the amp, 1 video to the tv and the amp is introducing a delay in processing before the sound is heard. He wants to delay the video so they sync up. Introducing a -ve audio delay (is it still a delay) would fix it, however, this may be hard to do on live tv. What you'd essentially be doing is delaying the video.

My suggestion of a game mode is also the opposite of what he wants (wasn't thinking).

mcraenz

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#271975 11-Nov-2009 11:13

In the case of digital TV "live TV " in never really live. I think this would have to be done on a per codec bassis :-(

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buzzy

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#271978 11-Nov-2009 11:22

What about buying a really long video cable, so the signal takes ~100ms extra to reach the TV? I reckon you'd need about 29 000 km of cable, so it'd have to be low cost-per-meter stuff, which means signal degradation may start to be an issue...

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Snowflake

#272210 11-Nov-2009 23:52

are you sure its the audio thats lagging? i've usually seen people with the opposite problem - especially when feeding a substandard picture to a large flatscreen which has to convert and upscale image first.

depending on your model of screen, you may be able to adjust video delay there too.

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