[mythtv-users] how to get direct MPEG2 output

Sam Byrne mythtv at ardentworks.com
Mon Nov 24 13:44:39 EST 2003


Sorry, thought you were quoting compressed video numbers...

Sam
On Mon, 2003-11-24 at 11:18, Sam Byrne wrote:
> And I'd say your approximation is incorrect.  Those numbers are
> extremely high.
> 
> Sam
> On Mon, 2003-11-24 at 10:56, Ken Bass wrote:
> > Jelle,
> > You are definitely not running uncompressed. If my *approximation* is correct:
> > Assuming 30 fps, 720 x 480 pixels, 24 bits/pixel:
> > 720 x 480 x 24 x 30 = 248,832,000bps ~ 31MB/sec * 3600secs/hour = 111 GB/hour
> > (74GB/hour at 480x480 which is mythtv default).
> > 
> > I have changed my recordings to use 352x480 which is called 1/2 D1 rate and it
> > is a resolution supported by the DVD standard. From what I understand there 
> > are only two
> > resolutions (in the NTSC world) that DVD supports - 720x480 and 352x480. If 
> > you are playing your DVD's using PC software sometimes those specs aren't 
> > enforced and you can get away with different resolutions but if your goals 
> > is to archive onto a DVD that is the most compatible with a range of 
> > standalone DVD players, I'm thinking only these two resolutions makes 
> > sense. By capturing at these resolutions I don't need to reencode. In 
> > theory you can then cut out the commercials for archiving without having to 
> > reencode. I still have not found a tool that lets me cut out commercials 
> > without reencoding. I've tried a ton of windows and linux programs and most 
> > of them either don't work or they screw up the audio/video sync. I'm still 
> > working on that.
> > 
> > At 11:23 AM 11/24/2003 -0500, you wrote:
> > >On Mon, 2003-11-24 at 09:44, Jelle Kalf wrote:
> > > > Hi,
> > > >
> > > > I tried recording 4:02 minutes of data and it came back to me with 151MB of
> > > > data. I have a PVR250 card which should have instand MPEG2 compression. 
> > > What did
> > > > I do wrong, because it looks like it's just outputting uncompressed data...
> > > >
> > > >
> > > > Jelle Kalf.
> > >
> > >151MB/4 minutes*60 minutes/hr ~ 2.2Gigs/Hr which is what I get with my
> > >PVR 250 and 350 under normal circumstances.  What makes you think this
> > >is wrong?
> > >
> > >
> > >-jose-
> > >
> > >_______________________________________________
> > >mythtv-users mailing list
> > >mythtv-users at mythtv.org
> > >http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
> > 
> > 
> > ______________________________________________________________________
> > _______________________________________________
> > mythtv-users mailing list
> > mythtv-users at mythtv.org
> > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
-- 
"ArdentWorks. Because complex information systems don't have to be."
Sam Byrne
P.O. Box 2259
Colorado Springs, CO 80901-2259
Tel. 719-964-3808 E-mail sam at ardentworks.com
http://ardentworks.com



More information about the mythtv-users mailing list