[mythtv-users] how many concurrent recordings possible? in HD?

Mudit Wahal mwahal at gmail.com
Fri Dec 9 19:23:42 EST 2005


My system is

ECS KT800A motherboard (frys $99 combo)
Sempron 3000+
180GB HD for recording shows (ext3 for all partitions)
200GB HD for storage (xfs file system)
pcHD3000
2.6.12 kernel
Fusion HDTV5 Lite
512MB DDR SDRAM

No raid, no lvm, nothing.


On 12/9/05, Mudit Wahal <mwahal at gmail.com> wrote:
> I was recording two HDTV streams at a time (HD3000 and Fusion HDTV
> Lite 5) and commercial flagging at the sametime.
>
> I was getting lot of corrupt/bad video when all 3 were happening
> simultaneously. It has more to do with IO bottlenecks than cpu/etc.
> The %wait was very high, about 80+. Remember that HDTV is recording at
> 19.2mbps rate vs much lower for PVRs. Check your backend logs and look
> for IOBound messages. I am running modified version of 0.18.1 with
> modified libs/libmythtv/RingBuffer.cpp which has much higher buffer
> size. This was to avoid IOBound issues.
>
> Now I dont do real time commercial flagging. I schedule my own
> commercial flagging when the system is not recording. I also dont use
> my backend for display.
>
> On 12/9/05, mrwester <mrwester at gmail.com> wrote:
> > Hi-
> >  My mythtv system has 1xPVR-350, 1xPVR-500 using ivtv 0.4, and a newly added
> > DViCO FusionHDTV 5 Lite using DVB drivers.   1x200GB seagate+1x300GB seagate
> > HD LVM with XFS for /video and 1x40GB seagate for FC4 OS. I have DMA
> > enabled. DVI out via fx5200 at 1280x768.  Chaintech nforce2 mobo, AMD2900
> > with 1gb ram.  All 4 tuners can capture on their own with no problems.  I
> > can capture with all 3 Hauppauge tuners at the same time no problems.
> > Trying to capture HDTV while capturing with the Hauppuge cards results in
> > normal analog recordings but the digital recording has dropouts and
> > scrambled bars across it.  I need to double check if capturing digital NTSC
> > with the DViCO card also has the dropouts when one or more PVR cards are in
> > use.
> >
> >  I'm new to the HDTV part of mythtv and looking for feedback to tell me if
> > what I'm trying to do is realistic or not.   And if it is realistic, where
> > should I look to troubleshoot.  Thanks for any insight.
> >
> >  Mike
> >
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> >
> >
> >
>


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