AC3 Audio out of sync/AC3 Problems (1 Viewer)

[Commodore 64]

I have audio sync issues with the 4/10/2006 SVN. Pausing/restartign does not fix the issue. Audio lags about a second behind video.

 

[Commodore 64]

Windows Version: Windows XP SP2
CPU Type: Pentium 4
Memory: 1GB PC3200
Motherboard: Asus P4PE800 Deluxe
Motherboard Chipset: i865PE
Motherboard Bios:
Video Card: Gigabyte 6600GT
Video Card Driver: 83.60
Sound Card: Onboard
Sound Card AC3: Optical Out
Sound Card Driver:
1. TV Card: Vbox DTA-150
1. TV Card Type: ATSC
1. TV Card Driver: BDA
2. TV Card: Fusion 5 Lite
2. TV Card Type: ATSC
2. TV Card Driver: BDA
Video Codec: NVidia Purevideo
Audio Codec: Mpeg/AC3/DD.../Nvidia Audio Decoder
Satelite/CableTV Provider: OTA
HTPC Case: Silverstone LC03V
Power Supply: Silvertsone Strider 400w
Remote: MCE USA
TV: Philips 30PW8520 (30" Widescreen CRT)
TV - HTPC Connection: Component

Using the 4-13-06 SVN Build, I have duplicated the original poster's issue. On my setup, all TV channels have AC3 sound.

Start MyTV, enable timeshifting and watch it for a while. The audio progressively becomes out of sync. Rewinding a bit into the TS buffer fixes the issue.

Also, when viewing TV without TS on, after a time, the audio begins to to go crazy. The signal drops in and out, My audio receiver indicates that it is intermittently getting a signal. I have to completely stop myTV in order to resolve the issue.

I think the 2 issues are related to AC3 in the OTA broadcast somehow.

I've attached logs, but they really don't seem to show anything amiss, as far as I can tell.

edit: Added the issue to Mantis: http://mantis.team-mediaportal.com/view.php?id=737

 

[infinite.loop]

so this is a Timeshift+AC3 related issue?
does not occur with Timeshift=off?

 

[Commodore 64]

It does not occur with TS off.

However, after a time, with TS off, AC3 sound will have a different issue. The signal drops in and out. The timing when this happens is about the same timing as when the Audio becomes out of sync when TS is on, so I think the issues are related.

 

[imported_KRA]

I see it has been confirmed as a bug now, that's good, because I just watched a movie (AC3) with my FloppyDTV-S, and noticed that the sound was drifting away from the image... a quick 15 second skip back and it was back in sync, or at least almost...

 

[bradsjm]

Windows Version: Windows XP SP2
CPU Type: AMD 64 3200+ [Socket 939]
Memory: 1GB
Motherboard: ASUS A8N-VM CSM
Motherboard Chipset: NVIDIA nForce 430
Motherboard Bios: ASUS 0702
Video Card: NVIDIA 6600GT
Video Card Driver: 84.21
Sound Card: AuzenTech X-Plosion
Sound Card AC3: Optical Out
Sound Card Driver: 5.12
1. TV Card: Avermedia A180
1. TV Card Type: ATSC
1. TV Card Driver: 1.2.2.23
2. TV Card:
2. TV Card Type:
2. TV Card Driver:
Video Codec: NVIDIA PureVideo 4020.203
Audio Codec: AC3Filter 1.0.1.0
Satelite/CableTV Provider:
HTPC Case: Origen AE X15
Power Supply: Seasonic 430W
Remote: MCE 2005
TV: BENQ Projector
TV - HTPC Connection: VGA (800x453)

This issue is easily reproducable for me. I have the Avermedia A180. It works fine in SageTV but audio is out of sync immediately when I go into any TV channel and then gets worse the longer I view. This is without timeshifting.

I've tried different audio and video decoders, Nvidia, Avermedia etc. and audio decoders (NVidia, AC3Filter etc.) with no perceptable difference. Logs are attached.

 

[Commodore 64]

Thanks brad! Good to have another ATSC user onboard. I'm glad you use an a180 becasue it is quite popular.
I added your log and the contents of your post to Mantis. http://mantis.team-mediaportal.com/view.php?id=737

These AC3 issues seem to be real buggers.

 

[petteram]

KRA.
which channels have AC3?
You are using Canal Digital?
I always have TS on and I have optical out from my soundcard
to my Logitech Z-5500 speakers, but havent noticed any sync problems.

 

[Commodore 64]

Windows Version: Windows XP SP2
CPU Type: Pentium 4
Memory: 1GB PC3200
Motherboard: Asus P4PE800 Deluxe
Motherboard Chipset: i865PE
Motherboard Bios:
Video Card: Gigabyte 6600GT
Video Card Driver: 83.60
Sound Card: Onboard
Sound Card AC3: Optical Out
Sound Card Driver:
1. TV Card: Vbox DTA-150
1. TV Card Type: ATSC
1. TV Card Driver: BDA
2. TV Card: Fusion 5 Lite
2. TV Card Type: ATSC
2. TV Card Driver: BDA
Video Codec: NVidia Purevideo
Audio Codec: NVidia Audio Decoder
Satelite/CableTV Provider: OTA
HTPC Case: Silverstone LC03V
Power Supply: Silvertsone Strider 400w
Remote: MCE USA
TV: Philips 30PW8520 (30" Widescreen CRT)
TV - HTPC Connection: Component

This morning, I left the TV on when I went to work. MP was using the Fusion5Lite to tune WKYC-HD. When my wife woke up some time later, she said the audio was gone, so she dropped out of MyTV, and back in to MyTV and said there was audio, but no picture.

I glanced through the MP log, and I noticed that there is an instance of "No Signal Detected", which is odd because WKYC-HD always tunes fine. I can't help but thing these issues are somehow related to bug 00697.

uploaded Fusion5_NoTSlog.rar to document this instance.