View Full Version : audio out-of-sync
January 18th, 2011, 01:36 PM
I have recently fixed or should I say found a band-aid for my audio lip sync with boxee box. I Have a 55" Samsung 120hz tv and an onkyo receiver. I have had problems with at least 98% of my local content movies with voice being out-of-sync. I tried everything from directly connecting the box to the tv and connecting my external drive to the box plus multiple network things. I had decided to turn off the 120hz auto motion feature and the voice sync got worse like it did with all of the other attempted fixes(listed above). Then Idecided to turn the game mode on and the voice and video were suddenly synced. I have no idea why that is but its quite frustrating to have spent $2000 on a tv that I cant use the one of the main features on. Has anyone else figured this out or have this problem? is this something with the Boxee box firmware or what?
January 18th, 2011, 02:11 PM
Most modern tv's have video processing hardware for image quality improvement (like motion compensation or higher frequency modes like 100Hz or 200Hz) which creates delays between input and output of video. The processing hardware in the tv itself knows how much delay is caused by each of the processing modes and as such is able too inform the audio output part of the tv how much it must delay the audio by in order to sync video and audio.
When you connect an external audio system to your playback device it will not delay your audio output to keep it in sync with the video because it doesn't know about the delay.
With video games another factor comes in play. Because there is a delay between the controller input and the video output most games become difficult to play.
In order to minimize this latency effect, most modern tv's have a game mode which switches off all the video processing to minimize the latency as much as possible.
The side effect of this is that the external audio will sync up with the video output on the tv.
Most surround audio systems have a setting to delay audio output in order to match the delay in the video path.
Check the manual of your Onkyo receiver to check for this option or keep using the game mode.
January 20th, 2011, 04:31 PM
I have messed around with the receiver audio off set and the one on the box and some movies were successful some got better and some got worse. I used to use PS3 media server and my PS3 and never had audio problems with the same setup (through the HDMI on the receiver to the tv) and using my regular 120hz setup and no need for the game mode to be on. So like I said before its frustrating that I cant use a main feature of the TV that I paid a ton of money for and that I'd have to adjust the audio sync for each individual movie. So I could only think that this is some sort of firmware on the box problem and not the tv or the receiver if I had another device streaming the same movies perfectly, and hooking the box to the tv should be flawless with the audio video sync according to your explanation of how the HDMI works. The audio was horribly out of sync and worse than the box to the receiver to the tv setup.
February 5th, 2011, 07:39 AM
well I found a fix I was installing my new klipsch speakers and I couldn't get them to sound right for anything, so I finally did a factory reset on the receiver and everything was fixed the voice was in sync and the system sounded great. So if anyone is having problems with voice or video problems and are running through their receiver I'd recommend doing a factory reset on the receiver
February 5th, 2011, 08:08 AM
Have you tried adjusting the sync delay on your onkyo receiver? I also have an onkyo receiver and I need to adjust it to the max of +250ms. It would be nice if the boxee had a global sync adjustment setting.
March 5th, 2011, 12:51 PM
well I just did a factory reset on the receiver and everything has been fine since
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