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

Mudit Wahal mwahal at gmail.com
Fri Dec 9 16:52:50 EST 2005

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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