View unanswered posts    View active topics

All times are UTC - 6 hours





Post new topic Reply to topic  [ 12 posts ] 
Print view Previous topic   Next topic  
Author Message
Search for:
 Post subject: Studdering DVD
PostPosted: Fri Nov 14, 2008 3:44 pm 
Offline
Joined: Sat Sep 02, 2006 9:17 am
Posts: 359
Hey all,
I'm running KM5.5 on a AMD X2 4000+ w an nVidia card (8500GT) driving an older Sony TV at 720p over DVI. This should be plenty of horsepower for DVD playback, but I get stuttering video on playback; audio is fine.
Any idea where to start?

Thanks,

Joe


Top
 Profile  
 
 Post subject:
PostPosted: Fri Nov 14, 2008 7:28 pm 
Offline
Joined: Sun Sep 25, 2005 3:50 pm
Posts: 1013
Location: Los Angeles
Is DMA turned on?

For how to:
Code:
man hdparm

_________________
Mike
My Hardware Profile


Top
 Profile  
 
 Post subject:
PostPosted: Sat Nov 15, 2008 12:58 am 
Offline
Site Admin
Joined: Fri Sep 19, 2003 6:37 pm
Posts: 2657
Location: Whittier, Ca
What are you using to play the DVDs? We include 4 options out the box... You aren't trying to use XvMC are you? XvMC doesn't work w/ the 8xzy series...


Top
 Profile  
 
 Post subject:
PostPosted: Sat Nov 15, 2008 11:46 am 
Offline
Joined: Sat Sep 02, 2006 9:17 am
Posts: 359
mihanson wrote:
Is DMA turned on?

Yes, it is.
cecil wrote:
What are you using to play the DVDs? We include 4 options out the box... You aren't trying to use XvMC are you?

The DVD player is mythtv's "Internal"

I didn't realize that about the 8xxx and XvMC, I did some googling around and learned from here xvmc is controlled by playback profiles. My playpack profile is "CPU++" which the docs I read say does not use xvmc. So I guess I unwittingly did the right thing there; If I had known it was off I would have tried turning it on :oops:


Top
 Profile  
 
 Post subject:
PostPosted: Sat Nov 15, 2008 1:18 pm 
Offline
Joined: Tue Jan 18, 2005 2:07 am
Posts: 1530
Location: California
Stuttering can occur for many reasons. Check you CPU utilization on playback to be sure that you aren't maxing out the CPU. (I agree that you probably are not). Check to be sure that the bob2x deinterlacer is being used.

Marc


Top
 Profile  
 
 Post subject:
PostPosted: Sat Nov 15, 2008 1:27 pm 
Offline
Joined: Sat Sep 02, 2006 9:17 am
Posts: 359
I did an experiment. I took an iso of a DVD; and loaded it in MythVideo. It played fine with the internal player. A physical DVD burned form that iso stutters.
So I'm guessing there's something wrong with the drive configuration, or maybe with the drive itself?

Drive information:
Code:
root@mythtv:~# hdparm -I /dev/hda

/dev/hda:

ATAPI CD-ROM, with removable media
        Model Number:       SONY    DVD RW DW-Q120A
        Serial Number:
        Firmware Revision:  PYS2
Standards:
        Used: ATAPI for CD-ROMs, SFF-8020i, r2.5
        Supported: CD-ROM ATAPI-2
Configuration:
        DRQ response: 50us.
        Packet size: 12 bytes
Capabilities:
        LBA, IORDY(cannot be disabled)
        DMA: *sdma0 *sdma1 *sdma2 sdma3 sdma4 sdma7 mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 *udma4 (?)
             Cycle time: min=120ns recommended=120ns
        PIO: pio0 pio1 pio2 pio3 pio4
             Cycle time: no flow control=240ns  IORDY flow control=120ns
Commands/features:
        Enabled Supported:
           *    PACKET command feature set
           *    DEVICE_RESET command
           *    Mandatory FLUSH_CACHE
HW reset results:
        CBLID- below Vih
        Device num = 0


Current setup:
Code:
root@mythtv:~# hdparm -acdkru /dev/hda

/dev/hda:
 IO_support   =  1 (32-bit)
 unmaskirq    =  1 (on)
 using_dma    =  1 (on)
 keepsettings =  0 (off)
 readonly     =  0 (off)
 readahead    = 256 (on)

Anything obviously wrong? Anything I should look at?


Top
 Profile  
 
 Post subject:
PostPosted: Sat Nov 15, 2008 6:38 pm 
Offline
Joined: Fri Jul 21, 2006 11:12 pm
Posts: 1183
Location: SC
I had a problem about a year ago with one of my DVD drives studdering and I solved it by setting IO_support and unmaskirq to 0. This is my hdparm for my DVD drive.
Code:
hdparm -acdkru /dev/hdc

/dev/hdc:
 IO_support   =  0 (default 16-bit)
 unmaskirq    =  0 (off)
 using_dma    =  1 (on)
 keepsettings =  0 (off)
 readonly     =  0 (off)
 readahead    = 256 (on)


Britney


Top
 Profile  
 
 Post subject:
PostPosted: Sat Nov 15, 2008 7:07 pm 
Offline
Joined: Tue Jan 18, 2005 2:07 am
Posts: 1530
Location: California
I just checked and my NEC IDE burner has DMA turned off. I then used hdparm to turn DMA on and access to the drive became very unstable. I then turned DMA mode off and now things are working well again.

I did a google search and found many references to people haivng problems with DMA turned on with DVD drives on various flavors of Linux. I didn't read the details.

So I agree with brfransen -- try turning off DMA mode.

Marc


Top
 Profile  
 
 Post subject:
PostPosted: Tue Nov 18, 2008 8:04 pm 
Offline
Joined: Sat Sep 02, 2006 9:17 am
Posts: 359
I turned off DMA and it did the trick!!!

Now how do I make it last across a reboot? I'm not seeing where hdparm is called initially. There's an /etc/init.d/hdparm, but no links in /etc/rc?.d


Top
 Profile  
 
 Post subject:
PostPosted: Tue Nov 18, 2008 9:50 pm 
Offline
Joined: Fri Jul 21, 2006 11:12 pm
Posts: 1183
Location: SC
Look in /etc/init.d/bootmisc.sh If it is not listed you should be able to disable it there.

Britney


Top
 Profile  
 
 Post subject:
PostPosted: Wed Nov 19, 2008 3:46 am 
Offline
Joined: Sun Aug 28, 2005 7:07 pm
Posts: 821
Location: Melbourne, Australia
From memory, there is an /etc/hdparm.conf

Mike

_________________
*********************
LinHES 7.4
Australian Dragon
*********************


Top
 Profile  
 
 Post subject:
PostPosted: Wed Nov 19, 2008 1:43 pm 
Offline
Joined: Thu Feb 12, 2004 2:54 pm
Posts: 392
Location: Beaumont, CA
I normally put that at the end of /etc/init.d/bootmisc.sh

_________________
ASUS A7N266 Micro-ATX Motherboard
Athlon 2200 processor
512K Kingston PC2100 Memory
MicroAtx Case
2 PVR250's w/remote
eVGA e-GeForce mx4000 (64 Ram with Tv/Out (Svideo))
Lite-on DVD cd-rw combo
120 GB Western Digital


Top
 Profile  
 

Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 12 posts ] 


All times are UTC - 6 hours




Who is online

Users browsing this forum: No registered users and 3 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Group

Theme Created By ceyhansuyu