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Discussion Starter · #1 ·
I have a Macbook Pro (Snow Leopard) hooked up to TV - Panasonic TH-58PZ800U Plasma. Its connected with Mini-DVI to HDMI adapter to HDMI cable to TV for video and Optical out to Onkyo AV Rcvr for audio.


Most (not all) of the videos I play (all different file formats) when connected to the TV have a audio/video sync issue where the video lags the sound by varying degrees.


This doe not happen when I play the video directly on the Mac or over my LAN from the Mac to a windows PC. So I'm thinking there must be some kind of video setting somewhere that creates this problem.


I hope someone can help. The home theater set up is pretty useless as is. Thanks!
 

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That's probably as a result of the image processing your Plasma does - I have the same problem, and it seems most LCDs and Plasmas do. Old CRTs pretty much just displayed the image as is, whereas new TVs process the image first, creating a lag.


Hopefully your Onkyo AVR has a lip-sync or delay setting that you can set to put a standard delay of "whatever" milliseconds on the audio to match the screen. I did that with my entry level Pioneer and haven't looked back.
 

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Discussion Starter · #3 ·

Quote:
Originally Posted by gwpac /forum/post/18159004


That's probably as a result of the image processing your Plasma does - I have the same problem, and it seems most LCDs and Plasmas do. Old CRTs pretty much just displayed the image as is, whereas new TVs process the image first, creating a lag.


Hopefully your Onkyo AVR has a lip-sync or delay setting that you can set to put a standard delay of "whatever" milliseconds on the audio to match the screen. I did that with my entry level Pioneer and haven't looked back.

I found the AV sync offset in my Onkyo and jacked it to max - 250 ms but I don't notice any difference. Any other thoughts?
 

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Discussion Starter · #5 ·

Quote:
Originally Posted by Further /forum/post/18159834


If you install VLC on your Mac, you can delay the audio even more.

As usual I didn't supply enuf detail in my original post! Sorry. I use VLC on the Mac for video playback when Mac is "on the road". But, when its "in" my Home Theater set up, I want to use the Plex Media center ap and it lags more there even than when I use VLC while connected to home theater stuff.


So, if I use VLC on Mac standalone, everything is fine. If I use VLC when Mac is connected to AV Rcvr and TV, then small lag. And via Plex larger lag.


I think I found the setting in VLC but can you confirm? There are lots of "cache" type settings that I see.
 

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If you go into the preferences, first make sure you select "all" instead of "basic". Next, click on "Audio" (at the top). Once the audio window has opened, look for "audio desynchronization compensation". It seems you can put any number in there you like.
 

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Discussion Starter · #7 ·

Quote:
Originally Posted by Further /forum/post/18161627


If you go into the preferences, first make sure you select "all" instead of "basic". Next, click on "Audio" (at the top). Once the audio window has opened, look for "audio desynchronization compensation". It seems you can put any number in there you like.

Found it and tweaked. Seems like its helps but I'm still wanting to use Plex for video viewing and now I see that of the different video types, it seems that the WMV format is really the culprit. AVI, MPG, and MOV play fine as well as ISO images and VIDEO_TS vob files.
 

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Plex also has a 'per file' audio offset setting. I'm trying to remember how you bring up the options menu when you've chosen a video, but I can't seem to recall it -sorry. But the setting is there.
 

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Discussion Starter · #9 ·
I fixed it! Its the the refresh setting in OS X. It was set to 24Hz and the change to 60Hz solved it! Thanks for all the help folks. Great forum of "friends". I hope I can help someone sometime.
 
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