[mythtv-users] Storage space and PVR-250

[Joe Votour]

I'll admit that I've never really played with
transcoding because MPEG-2 is good enough for my
purposes (I don't usually take the shows off of the
machine, they stay on it until I watch them and delete
them).

However, I believe that you'll want to go back into
the recording profiles.  You should notice that
there's profiles for MPEG-2 cards, V4L (I think that's
what it's called) cards, and Transcoders.  Under
Transcoders, there's then another set of categories
for the source input (MPEG-2 versus RTJPEG), and by
selecting the appropriate category, you can play with
the parameters.

-- Joe

--- Derek Tattersall <tatters at newsguy.com> wrote:

> Thanks for the assistance, you've been very patient
> with my questions.
> That fixed it.
> 
> So I have another question. Which options control
> the format (and
> presumably the size) of the file you get after
> transcoding?
> 
> Thanks
> 
> Derek Tattersall
> 
> On Wed, 2005-04-13 at 20:24 -0700, Joe Votour wrote:
> > The .nuv file that the PVR-250 creates is an
> MPEG-2
> > file.
> > 
> > I'm not sure what format the large file you're
> getting
> > is in (because MythTV calls everything .nuv files
> for
> > convenience).
> > 
> > You want to disable automatic transcoding.  This
> is in
> > your recording profiles.  Go through all of them
> to
> > make sure that you don't have "Automatically
> transcode
> > after recording" checked off.
> > 
> > -- Joe
> > 
> > --- Derek Tattersall <tatters at newsguy.com> wrote:
> > > I appreciate the help I've been getting here. I
> am a
> > > complete newby to
> > > the world of computer video.
> > > 
> > > I just noticed that when mythtv records the
> program
> > > from my PVR-250 the
> > > resulting nuv file is of a reasonable size
> (about
> > > 1Gb per hour of
> > > video). After the program is finished, mythtv
> > > transcodes that file into
> > > something that is hideously large, about 27Gb
> per
> > > hour of video, still
> > > called a nuv file. What formats are these files?
> > > 
> > > What option controls this, and how do I disable
> it?
> > > 
> > > I just went through the front and back end setup
> > > menus and I didn't see
> > > anything that looks likely. I am obviously
> missing
> > > something, but what?
> > > 
> > > Thanks
> > > 
> > > Derek Tattersall
> > > 
> > > On Wed, 2005-04-13 at 18:33 -0500, William
> Powers
> > > wrote:
> > > > Try this:  Go into the default recording
> profile
> > > for the PVR250 and set 
> > > > your resolution to 352x480 and your encoder
> > > bitrate to 2200 
> > > > kbit/second.  That's about the absolute
> minimum
> > > bitrate/resolution combo 
> > > > I've found to be usable for standard TV. 
> YMMV. 
> > > Record something and 
> > > > try watching it over your 802.11b link.  If
> the
> > > playback is jerky, then 
> > > > you'll probably need to upgrade to 802.11g or
> > > faster, regardless of 
> > > > whether you like the picture quality or not.
> > > > 
> > > > If the playback is smooth, but you can't stand
> the
> > > picture quality, try 
> > > > increasing the bitrate without increasing the
> > > resolution and see if you 
> > > > can find a setting that works for you.  If you
> > > must increase the 
> > > > resolution (to, say, 480x480), then you will
> have
> > > to substantially 
> > > > increase the bitrate (eg., I use at least 4500
> > > kbps/sec at 480x480 or 
> > > > better).  The more you must increase the
> bitrate,
> > > the less the chance 
> > > > that 802.11b is going to work for you.
> > > > 
> > > > Good luck!
> > > > 
> > > > Bill
> > > > 
> > > > Derek Tattersall wrote:
> > > > 
> > > > >I just set up a mythtv box using a pvr-250 as
> the
> > > capture card. I
> > > > >scheduled a recording of a 1/2 hour tv show,
> and
> > > it worked well. When I
> > > > >played back the recording it looked great. So
> far
> > > so good. However that
> > > > >1/2 hour recording takes up 13gb on my disk.
> I
> > > would like to find a more
> > > > >efficient way to store recordings even if I
> have
> > > to sacrifice some
> > > > >quality.
> > > > >
> > > > >How do I set up mythtv to reencode the
> recordings
> > > to a more space
> > > > >efficient format?
> > > > >
> > > >
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> > > 
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