[mythtv] large file when recording and watching

Mark Covington markcov at alumni.rice.edu
Thu Apr 22 11:36:47 EDT 2004

Joseph - Sorry I didn't make it clearer earlier.  File sizes are normal
(1.5GB/30 min) when I'm recording and NOT watching/previewing a video at the
same time.  They only balloon up when I'm doing both.  That's what led me to
believe it was a software configuration issue.

Debabrata - I'll try MPEG4, I figured my CPU wasn't strong enough for it.  I
played with it initially (a year ago), and was disappointed in the video quality
that was coming out.  Everything was too blocky compared to what RTJPEG could
produce.  Thanks for the tips/info.  There hasn't been any changes recently to
RTJPEG has there?  B/c my machine was perfectly fine to watch/record
simultaneous for a year up until mid/late March.  64GB/hr sounds about right for
the huge files I was getting though.  Here's hoping MPEG4 will help.

Barring that, I'll test out a faster processor.

Mark Covington
markcov at alumni.rice.edu

Quoting Debabrata Banerjee <davatar at comcast.net>:

> From: "Joseph A. Caputo" <jcaputo1 at comcast.net>
> > 1.0 GHz/192 MB RAM is a bit on the skimpy side for recording 1 stream +
> > watching another, however, AFAIK you'd be more likely to see dropped
> > frames and/or choppy playback in that case rather than increased file
> > sizes.  Given that downgrading didn't solve your problem, I'd suspect
> > some other change in your system (signal quality, new kernel, hardware
> > changes?), but I'm afraid you've exhausted my expertise in this area.
> >
> > Anyone else care to chime in?
> >
> > -JAC
> I'd say don't use RTJPEG. When I was using RTJPEG I noticed this issue as
> well. I think it's an RTJPEG bug, I noticed this in particular when a solid
> blue screen from my vcr, it sent the RTJPEG bitrate/cpu through the roof.
> (something like 64GB/hour).
> MPEG4 looks overwhelming at first, but it's cpu usage goes down as you lower
> the bitrate. 1Ghz should be fine as long as you keep the bitrate low. Also
> since that cpu has only 256k cache, you want to keep the frame size low.
> i.e. 480x480 or less, otherwise you'll find you need a lot of cpu power. I
> was running this setup on an athlon 700 just fine, with crop and quickdnr
> filters to boot.
> -Debabrata
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