Delayed sound after TV channel change

fanformusik · 2008-04-24, 18:04

TV-Server Version: 1.0RC1
MediaPortal Version: 1.0RC1
MediaPortal Skin: Monochrome 1.7
Windows Version: Windows XP SP2
CPU Type: AMD64 X2 BE2400
HDD: 250GB Samsung
Memory: 2GB
Motherboard: MSI K9AGM2-FIH
Video Card: AMD X1250 (AMD690G)
Video Card Driver: ATI Catalyst 8.2
Sound Card:
Sound Card AC3:
Sound Card Driver:
1. TV Card: Floppy DTV
1. TV Card Type: DVB-C
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: PDVD7
MPEG2 Audio Codec: PDVD7
h.264 Video Codec: CoreAVC 1.7
Satelite/CableTV Provider: KabelBW
HTPC Case: HIPER
Cooling:
Power Supply:
Remote:
TV: Viewsonic VX2835wm
TV - HTPC Connection: Sub-D

Info: This is a re-post of another thread, now in coherence with the forum's bug post rules.

When changing channels in live TV mode, I often end up with getting video but no sound for the first 5...15 seconds. After this time sound starts and video pauses, until both are in sync. Then live TV runs as normal, but with the introduced delay.
When I stop live TV before changing channels I seem not to get this effect (not 100% sure though). Playing around with different audio decoders made no difference.

In the log attached, this was the operating sequence:
- Start MP, go to TV, select first channel, start live TV and go to fullscreen mode
- switch from CH1 to channel 2,3,4,5,....,10 using the number keys on the keyboard: the delay appeared with CH3 (S3-BW), CH6 (hr), CH9 (SF2)
- stop live TV, close MP, collect logs.

megacrypto · 2008-04-24, 19:30

i get the same thing with 1.0RC1, but its not always, but it happens sometimes that when i change channels, it acts like fanformusik described exactly

tourettes · 2008-04-25, 07:06

Try some other audio decoder than Cyberlink. MPA / ffdshow.

fanformusik · 2008-04-25, 07:49

I will try that and come back with the information, but there is another post in the Get Support section that reports the identical problem in a totally different setup: Delayed audio after channel change

So I think this is a more general issue.

@megacrypto: What is your setup?

infinityloop · 2008-04-25, 07:54

i have the same issue with Cyberlink as audio codec.
use MPA, that works.

fanformusik · 2008-04-25, 17:27

Hi,
I checked with MPA, and the sound delay on channel change is gone.
But I got other problems with MPA when watching videos (no sound at all), and I'll open another thread on this. Problably I will continue using PDVD7 as Audio decoder.

nilsga · 2008-04-27, 16:13

Quote:

Originally Posted by fanformusik

Delayed audio after channel change

Yeah, I have this issue as well. I have tried a few different audio codecs, with different results, but none works without problems. Sometimes the video just freezes and starts playing after a little while, and sometimes it freezes without starting, and I have to turn TV off and on again to get the video playing. It appears to me that switching to and from a particular channel (TV2 Norge) it happens more often than for other channels.

In DVBViewer everything plays just fine, with the same decoders.

I have attached my logs from a couple of runs.

SciDoctor · 2008-04-27, 19:34

Similar problems here with MPV/MPA and MS VISTA codecs.

64QAM broadcasts are more prone than 16QAM .

Sometimes the sync is so far out after a jump forward that the playbak goes into ultra fast forward without sound.

Usualy if no sound present after a jump forward or channel change then a 5 second jump back syncs both.

2008-04-25, 07:06	#3 (permalink)
tourettes Portal Developer Join Date: Jan 2005 Age: 30 Posts: 2,933 Thanks: 74 Thanked 82 Times in 67 Posts	Try some other audio decoder than Cyberlink. MPA / ffdshow. __________________ http://day2.no-ip.org/ "Commy64 - The problem there is that Oprah was on. MP tried to save you by blanking the screen"

2008-04-25, 07:54	#5 (permalink)
infinityloop Project Coordinator Join Date: Dec 2004 Location: 127.0.0.1 Age: 28 Posts: 5,943 Thanks: 151 Thanked 112 Times in 78 Posts Country: My System	i have the same issue with Cyberlink as audio codec. use MPA, that works. __________________ regards chris MediaPortal Project Coordinator Test Team Leader Do not start to moan if something is not working as you want it to be. Remember that MediaPortal is Open Source. YOU can improve it!

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2008-04-24, 19:30	#2 (permalink)
megacrypto Portal Member Join Date: Oct 2006 Posts: 105 Thanks: 0 Thanked 0 Times in 0 Posts	i get the same thing with 1.0RC1, but its not always, but it happens sometimes that when i change channels, it acts like fanformusik described exactly

2008-04-25, 07:49	#4 (permalink)
fanformusik Portal Member Join Date: Aug 2007 Posts: 78 Thanks: 0 Thanked 0 Times in 0 Posts Country: My System	I will try that and come back with the information, but there is another post in the Get Support section that reports the identical problem in a totally different setup: Delayed audio after channel change So I think this is a more general issue. @megacrypto: What is your setup?

2008-04-25, 17:27	#6 (permalink)
fanformusik Portal Member Join Date: Aug 2007 Posts: 78 Thanks: 0 Thanked 0 Times in 0 Posts Country: My System	Hi, I checked with MPA, and the sound delay on channel change is gone. But I got other problems with MPA when watching videos (no sound at all), and I'll open another thread on this. Problably I will continue using PDVD7 as Audio decoder.

2008-04-27, 19:34	#8 (permalink)
SciDoctor Portal Tester Join Date: Feb 2005 Location: England Posts: 1,035 Thanks: 5 Thanked 8 Times in 8 Posts My System	Similar problems here with MPV/MPA and MS VISTA codecs. 64QAM broadcasts are more prone than 16QAM . Sometimes the sync is so far out after a jump forward that the playbak goes into ultra fast forward without sound. Usualy if no sound present after a jump forward or channel change then a 5 second jump back syncs both.