Video/Audio sync problems after TV start or channel change (1 Viewer)

[Owlsroost]

TV-Server Version: 1.0 SVN 21688 'disaster123' modified version
MediaPortal Version: 1.0 SVN 21688 'disaster123' modified version
MediaPortal Skin: Blue 3 wide
Windows Version: Vista Home Basic SP1
CPU Type: Intel E4500, 2.2GHz
HDD: 500GB
Memory: 2GB
Motherboard: Dell Vostro 200SL
Video Card: XFX 9500GT low-profile
Video Card Driver: 181.20
Sound Card: Creative SoundBlaster Audigy SE
Sound Card AC3: Creative SoundBlaster Audigy SE
Sound Card Driver: P17X_PCDVT_LB_1_04_0079
1. TV Card: Kworld DVB-T 399U
1. TV Card Type: DVB-T
1. TV Card Driver: V8.4.28.1
2. TV Card:
2. TV Card Type:
2. TV Card Driver:
3. TV Card:
3. TV Card Type:
3. TV Card Driver:
4. TV Card:
4. TV Card Type:
4. TV Card Driver:
MPEG2 Video Codec: PDVD7
MPEG2 Audio Codec: FFDShow (rev2653) (libavcodec)
h.264 Video Codec: MPC-HC
Satelite/CableTV Provider:
HTPC Case:
Cooling:
Power Supply:
Remote: USB-UIRT -> EventGhost
TV: Panasonic TX37LZD80 @ 1920x1080p
TV - HTPC Connection: DVI -> HDMI

Hi,

Almost always after starting live TV or following a channel change the video and audio will be out-of-sync. The problem sometimes also happens when playing recorded TV files. This is all SD DVB-T (UK Freeview), so MPEG-2 video/Layer 2 audio.

A reliable workaround/fix for the problem is to skip forward (using the right arrow key) to the end of the timeshift buffer - this puts the video and audio back in sync (and they then stay in sync until the next channel change).

The problem doesn't happen with other video and DVD playback - it seems to happen only when the 'tsreader.ax' filter is used to read the files, and then only when playback is first started i.e. it appears to be a stream startup problem involving 'tsreader.ax'.

I assume that the 'skip forward' workaround forces the streams to be re-synchronised - maybe since the filtergraph is running at this point the filter latencies are known and can be compensated for more easily ?

I've tried various codec combinations, but although this can change the exact behaviour, it doesn't fix it.

Anyone else have (or had) the problem ?

Tony

 

[Owlsroost]

Update

OK, I've updated to the latest 'disaster123' MP version - no real change except that the problem now occurs almost every time after a channel change. It's usually in-sync when TV is first turned on. Again skipping to the end of the timeshift file fixes the problem (until the next channel change).

One thing I have noticed is that after a 'skip forward to end' operation, it actually replays the last few seconds of TV i.e. it's actually skipping back a few seconds from the end of the timeshift file.

I've attached log files for a simple sequence of:

start MP -> turn on TV (vid+aud in sync) -> switch channel ((vid+aud not in sync) -> skip forward to end (vid+aud now in sync) -> stop TV -> close MP

It's single-seat setup, using the 'MS loopback adaptor' as the network connection (to avoid the unreliable WLAN issues).

Any suggestions ?

Tony

 

[lordarcane]

I have the same problem when watching "live tv". A pause and unpause solves it. It occures after channel change. I have no problem when watching movies from hardrive. I have tried ffdshow, arcsoft and the mpv/mpa codecs in different combinations. No difference. I´m running MP 1.0 both tvserver and MP.

I should add that I have tried both vmr9 and EVR.

TV-Server Version: 1.0
MediaPortal Version: 1.0
MediaPortal Skin: Black & White 1080
Windows Version: Xp SP3
CPU Type: Intel 8200, 2.66GHz
HDD: 320
Memory: 2GB
Motherboard: P5kVM
Video Card: ATI 4550
Video Card Driver: 181.20
Sound Card: Terratec Aureon
Sound Card AC3: Terratec Aureon
Sound Card Driver: Google code driver by Dogbert
1. TV Card: Azurewave AD-tp300
1. TV Card Type: DVB-T
1. TV Card Driver:
2. TV Card:
2. TV Card Type:
2. TV Card Driver:
3. TV Card:
3. TV Card Type:
3. TV Card Driver:
4. TV Card:
4. TV Card Type:
4. TV Card Driver:
MPEG2 Video Codec: Several (arcsoft, ffdshow, mpv
MPEG2 Audio Codec: Several (arcsoft, ffdshow, mpa

 

[dhasselqvist]

I also had the exact same behaviour and tried different codecs only to find out that nothing helped. Then I realised that I had installed ReClock filter. After uninstalling ReClock the problem has never occured again with any codec combination. ReClock was, at least on my 2 systems, the cause of the sync problems after channel change.

 

[lordarcane]

I have indeed reclock installed. Though, I have not enabled it as default renderer in mediaportal TV settings. I have it as default rendered to videos though. But, maybe it interfiers in somewhay anyhow. I will try to unistall it to see what happens! Thanks for the feedback!

 

[lordarcane]

I can confirim that uninstalling ReClock fixed my problem with audio/video out of sync when changing channel, Now, everything is in perfect sync! MediaPortal FTW!!! And, thank you dhasselqvist for the tip!

 

[riadmelb]

I'm gonna bring this 1 year old post back to life!

I have ReClock installed but only enalbed for the video section.

The problem is that I really need ReClock to sync my 23.976fps movies, so I don't want to uninstall it.

Just out of curiosity, why do you think this is happening? Is it a ReClock bug?

Thanks,
Riado

 

[pickard]

I Had the same issue and i solved it.

1. first try to get coreavc codec and install it.
2.then set coreavc in the video post processing .
3. set tv codec h264 to use core avc.

this should solve the sync problem.

Tzach