[mythtv-users] Audio Sync problem -- need help

[Craig Huff]

> ----- Original Message ----
> From: John Drescher <drescherjm at gmail.com>
> To: Discussion about mythtv <mythtv-users at mythtv.org>; huffcs at yahoo.com
> Sent: Friday, May 18, 2007 1:00:14 PM
> Subject: Re: [mythtv-users] Audio Sync problem -- need help
> 
> > John,
> >
> > Thanks for the input.  Can you point me in the direction of information on
> > how to do this?  (Changes to mythArchive scripts?  Manual operations before
> > invoking mythArchive? ???)
> >  Craig Huff
> >
> I believe the only change to the mytharchive script was to remove the
> --fix-sync option. I have posted my script that does the commercial
> cutting a few weeks back on the list. If you can not  find it please
> contact me and I will try to find it in my mail account as I am at
> work and as a result of some hardware failure I can not ssh into my
> home network...
> 
> The script is pxcut.sh. It needs to be edited and all instances of
> jmd0 need to be replaced with the name of your master backend machine.
> Also paths need to be updated to match your setup.
> 
> Now what I do is I first go in mythtv. View the show and press E to
> edit then I hit page-down (I believe) to turn on the commflag cuts.
> Then I edit these for each show that I want to cut. Then I exit
> mythfrontend and do a
> 
> ls *<something showspecific>.mpg | xargs -n1 -i sh pxcut.sh {}
> 
> Then this cuts all the shows that I had selected in the ls command
> renaming the originals to filename.mpg.old.
> 
> Then after that I run mytharchive for the shows I cut. I usually do
> this days after I did the cut.. This proceedure has only failed on 1
> dvd for me and I have made > 100 with mytharchive.
> 
> John



John,

Thanks again!  I got the script and will give it a whirl.

Now that I'm at home, I was looking at my mythbackend.log file and see that there are occasional entries like these during recording times:

2007-05-17 22:31:06.766 TFW, Error: Write() -- IOBOUND begin cnt(2048) free(1091)
2007-05-17 22:31:07.185 TFW, Error: Write() -- IOBOUND end

As a first action, I am changing my backend settings to disable the option "Start Auto-Commercial Flagging jobs when the recording starts".

Can you (or anyone else reading this) advise me, given the configuration info below, what I need to do to eliminate the I/O bounding?

Athlon 64 3200+ (2GHz?) on an ASUS A8N-SLI motherboard running 2.6.20-1.2944_1.fc6 with Suspend2 installed and configured
512 MB RAM (DDR 333 / PC2700)
WD 250GB PATA HD
(partitioned with separate slices for /, /var, swap, /boot, and /video with
root, /var, and /boot formatted ext3 with journals, and /video configured as an LVM volume with ext3 and journal)
PVR-350
PVR-500
GE Force 7300GS PCIe w/ TV-Out using nvidia-graphics9755 driver
AHA-2940 Adaptec SCSI PCI adapter (for SCSI tape backup)
DVD+/-RW drive
IOMEGA 250MB Zip drive

In particular, do I need or would I benefit from more RAM?
Am I likely hitting a disk I/O throughput limit and will replacing the PATA drive with an SATA drive make much difference?  Do I need to consider using the motherboard-supported SATA RAID and mirror a couple of SATA drives?  Avoid the hardware RAID and configure software RAID?

What should I look at to determine the source of the IOBOUND issue?

Craig Huff




       
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