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auttila
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 Posted: Tue Jan 30, 2007 11:31 pm |
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Joined: Tue Nov 28, 2006 3:38 am
Posts: 82
Location:
Kangasala, Finland
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Now that I have everything up and running (except LIRC, but that's a future project) I will concentrate on capture-issue which has been bothering me from the beginning.
The problem is that the picture, although good in quality, is twitching every now and then. About every three to five seconds comes a short (about quarter of a second) jerk, and it is quite annoying. The signal strength is about 55%. But that propably is not the case. I have two TechnoTrend Budget T1500 DVB-T cards. PCI Delay is enabled in BIOS, and PCI latency is 32.
Does anyone have any ideas on how to get rid of it and/or how can I debug it?
_________________
Jari-Matti
MBE&FE: GeForce MX440, Athlon XP 2000+, MSI KT333 Ultra, onboard audio, 512 MB, 2 x Technotrend T1500 DVB-T, LiteOn DVD±RW 16x DW1650-488C, Seagate 250 GB
FE: 1500MHz Geforce MX200-V, int. audio, 256MB
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mad_paddler
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Posted: Wed Jan 31, 2007 3:16 am |
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Joined: Sun Jun 12, 2005 2:39 pm
Posts: 464
Location:
UK
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Have you checked if dma is enabled on the hard drive?
Also, do you get the twitching when watching an already recorded program?
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auttila
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Posted: Wed Jan 31, 2007 11:06 pm |
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Joined: Tue Nov 28, 2006 3:38 am
Posts: 82
Location:
Kangasala, Finland
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Thanks for the tip!
After a little googling and looking through manufacturers specs, I set the DMA on with hdparm. But unfortunately it didn't help.
Then I tested it with a few AVI's and DVD's. They are playing fine, so the the twitching occurs when wathing LiveTV or recorded shows.
Any suggestions other that to get a new motherboard and stuff?
_________________
Jari-Matti
MBE&FE: GeForce MX440, Athlon XP 2000+, MSI KT333 Ultra, onboard audio, 512 MB, 2 x Technotrend T1500 DVB-T, LiteOn DVD±RW 16x DW1650-488C, Seagate 250 GB
FE: 1500MHz Geforce MX200-V, int. audio, 256MB
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mad_paddler
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Posted: Thu Feb 01, 2007 6:04 am |
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Joined: Sun Jun 12, 2005 2:39 pm
Posts: 464
Location:
UK
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Although i'm pretty sure that CPU is powerful enough, what's the CPU usage like while watching live tv? If you don't know how to find out, ssh in from another PC and run the command: top
Other than that i'm not sure what else you could try, i've only experience with the Hauppauge nova-t's.
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auttila
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Posted: Fri Feb 02, 2007 2:04 pm |
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Joined: Tue Nov 28, 2006 3:38 am
Posts: 82
Location:
Kangasala, Finland
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CPU seems to running at about 27-34%us, 3-5.5%sy, 0%ni, 60-65%id, 0-0-0.5%hi, 0.7%si, 0.0%st. So that's propably not an issue.
But hey - could memory cause this twitching?
I have 513280k total, but only about 4000k free, and I'm running only one instance of LiveTV? Other values are about 2000k buffers, 330000k cached.
_________________
Jari-Matti
MBE&FE: GeForce MX440, Athlon XP 2000+, MSI KT333 Ultra, onboard audio, 512 MB, 2 x Technotrend T1500 DVB-T, LiteOn DVD±RW 16x DW1650-488C, Seagate 250 GB
FE: 1500MHz Geforce MX200-V, int. audio, 256MB
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silentmic
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Posted: Fri Feb 02, 2007 5:20 pm |
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Joined: Fri Feb 03, 2006 11:36 pm
Posts: 63
Location:
Melbourne
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I used to have these sort of problems. I found it was fixed when I made the video resolution exactly the same as the tv, which is a PAL 4:3 CRT. This is probably not your problem because you've just installed, but I started with Mythtv version 0.18 and until recently was having quite a few glitches on some channels. I did a rescan of the channels using the automatic scan in 0.20 and the signal strength shows as more than 10% higher and there aren't any glitches.
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nigelpearson
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Posted: Fri Feb 02, 2007 8:26 pm |
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Joined: Wed Mar 03, 2004 7:43 pm
Posts: 748
Location:
Sydney, Australia
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Jari-Matti, look at the output from mythfrontend. It is usually in ~mythtv/.xsession-errors, or you can strt up an XTerm (Alt-X) and type mythfrontend in there.
If the problem is interference or low signal strength, this usually comes as errors in the scream which will be logged. Similarly if your video card drivers don't support XV.
You could also try Xine or MPlayer on the recorded files.
_________________ | Nigel Pearson, nigel.pearson.au@gmail.com| "Things you own end up owning you" - Tyler, Fight Club
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auttila
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Posted: Sun Feb 04, 2007 6:45 am |
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Joined: Tue Nov 28, 2006 3:38 am
Posts: 82
Location:
Kangasala, Finland
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I havn't tested the screen resolution issue yet, but it's next on my list to do... The signal strength shows about 60%, so it should be enough. However, mythfrontend output was like the one below. The most interesting part is at the end: "NVP: prebuffering pause" occurs in the log just as many times as there are twitches when watching LiveTV!
I tried that many times and that must be the reason. Does anyone have any ideas on what might be wrong?
Code: 2007-02-03 21:28:23.093 Using runtime prefix = /usr
2007-02-03 21:28:23.107 DPMS is disabled.
2007-02-03 21:28:23.155 New DB connection, total: 1
2007-02-03 21:28:23.163 Connected to database 'mythconverg' at host: localhost
2007-02-03 21:28:23.167 Total desktop dim: 800x600, with 1 screen[s].
2007-02-03 21:28:23.172 Using screen 0, 800x600 at 0,0
2007-02-03 21:28:23.194 Current Schema Version: 1160
2007-02-03 21:28:23.195 mythfrontend version: 0.20.20060828-3 www.mythtv.org
2007-02-03 21:28:23.195 Enabled verbose msgs: important general
2007-02-03 21:28:23.743 Total desktop dim: 800x600, with 1 screen[s].
2007-02-03 21:28:23.745 Using screen 0, 800x600 at 0,0
2007-02-03 21:28:23.746 Switching to square mode (MythCenter)
2007-02-03 21:28:23.825 Using the Qt painter
2007-02-03 21:28:24.067 Loading from: /usr/share/mythtv/themes/default/base.xml
2007-02-03 21:28:24.299 Registering Internal as a media playback plugin.
2007-02-03 21:28:24.389 Registering MythDVD DVD Media Handler as a media handler ext()
2007-02-03 21:28:24.391 Mediamonitor: Adding /dev/cdrom
2007-02-03 21:28:24.456 Mediamonitor: AddDevice() -- Not adding '/dev/hdc', it appears to be a duplicate.
2007-02-03 21:28:24.460 Registering MythDVD VCD Media Handler as a media handler ext()
2007-02-03 21:28:24.519 Registering MythGallery Media Handler 1/2 as a media handler ext()
2007-02-03 21:28:24.519 Registering MythGallery Media Handler 2/2 as a media handler ext(gif,jpg,png)
2007-02-03 21:28:24.519 MonitorRegisterExtensions(0x100, gif,jpg,png)
2007-02-03 21:28:26.243 Registering MythMusic Media Handler 1/2 as a media handler ext()
2007-02-03 21:28:26.244 Registering MythMusic Media Handler 2/2 as a media handler ext(ogg,mp3,aac,flac)
2007-02-03 21:28:26.244 MonitorRegisterExtensions(0x40, ogg,mp3,aac,flac)
2007-02-03 21:28:26.452 Starting media monitor.
SIP listening on IP Address 10.0.0.58:5060 NAT address 10.0.0.58
SIP: Cannot register; proxy, username or password not set
2007-02-03 21:28:28.455 New DB connection, total: 2
2007-02-03 21:28:28.456 Connected to database 'mythconverg' at host: localhost
2007-02-03 21:28:28.511 Connecting to backend server: 127.0.0.1:6543 (try 1 of 5)
2007-02-03 21:28:28.513 Using protocol version 31
2007-02-03 21:28:28.528 TV: Attempting to change from None to WatchingLiveTV
2007-02-03 21:28:28.529 Using protocol version 31
2007-02-03 21:28:28.651 NVP: Disabling Audio, params(-1,2,44100)
2007-02-03 21:28:28.706 VideoOutputXv: XvMCTex: Init failed
2007-02-03 21:28:28.707 VideoOutputXv: XVideo Adaptor Name: 'ATI Radeon Video Overlay'
2007-02-03 21:28:29.514 TV: Changing from None to WatchingLiveTV
2007-02-03 21:28:29.543 Using realtime priority.
2007-02-03 21:28:29.564 Video timing method: DRM
2007-02-03 21:28:29.738 VideoOutputXv: XvMCTex: Init failed
2007-02-03 21:28:29.738 VideoOutputXv: XVideo Adaptor Name: 'ATI Radeon Video Overlay'
2007-02-03 21:28:30.088 AFD: Opened codec 0xa7f8bb0, id(MPEG2VIDEO) type(Video)
2007-02-03 21:28:30.109 AFD: Opened codec 0xa7f7b20, id(MP3) type(Audio)
2007-02-03 21:28:30.109 AFD: Opened codec 0xa80c420, id(DVB_SUBTITLE) type(Subtitle)
2007-02-03 21:28:30.115 Opening OSS audio device '/dev/dsp'.
2007-02-03 21:28:30.125 NVP: Enabling Audio
2007-02-03 21:28:32.087 NVP: prebuffering pause
2007-02-03 21:28:32.606 NVP: prebuffering pause
2007-02-03 21:28:35.636 NVP: prebuffering pause
2007-02-03 21:28:37.318 NVP: prebuffering pause
2007-02-03 21:28:37.617 NVP: prebuffering pause
2007-02-03 21:28:38.534 NVP: prebuffering pause
2007-02-03 21:28:41.820 TV: Attempting to change from WatchingLiveTV to None
2007-02-03 21:28:51.973 TV: Changing from WatchingLiveTV to None
Destroying SipFsm object
_________________
Jari-Matti
MBE&FE: GeForce MX440, Athlon XP 2000+, MSI KT333 Ultra, onboard audio, 512 MB, 2 x Technotrend T1500 DVB-T, LiteOn DVD±RW 16x DW1650-488C, Seagate 250 GB
FE: 1500MHz Geforce MX200-V, int. audio, 256MB
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auttila
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Posted: Mon Feb 12, 2007 1:54 am |
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Joined: Tue Nov 28, 2006 3:38 am
Posts: 82
Location:
Kangasala, Finland
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Some progress...
The prebuffering pause does not seem to be related to DVB-T -cards. When watching the captured streams from my XP machine, they play very nicely.
So the problem is related to playing the recordings. Either audio or video. I'm having Radeon 8500, with the drivers that came with KnoppMyth R5E50, tried the proprietary drivers but never got them to work.
Does anyone have a clue about what might be causing the NVP: prebuffering pause -issue?
_________________
Jari-Matti
MBE&FE: GeForce MX440, Athlon XP 2000+, MSI KT333 Ultra, onboard audio, 512 MB, 2 x Technotrend T1500 DVB-T, LiteOn DVD±RW 16x DW1650-488C, Seagate 250 GB
FE: 1500MHz Geforce MX200-V, int. audio, 256MB
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auttila
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Posted: Mon Feb 12, 2007 3:01 am |
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Joined: Tue Nov 28, 2006 3:38 am
Posts: 82
Location:
Kangasala, Finland
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It's working now!
The problem was with audio. In general settings I selected "AC3 throughput to SPDIF" and aggresive soundcard management.
Voila - twitching is gone, no more prebuffering pause-errors!
Thanks for everyone for their help!
_________________
Jari-Matti
MBE&FE: GeForce MX440, Athlon XP 2000+, MSI KT333 Ultra, onboard audio, 512 MB, 2 x Technotrend T1500 DVB-T, LiteOn DVD±RW 16x DW1650-488C, Seagate 250 GB
FE: 1500MHz Geforce MX200-V, int. audio, 256MB
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