[mythtv-users] RE:prv-250 capture settings and video quality
Vinton Coffman
vintonc at redzone.com
Thu May 22 00:06:34 EDT 2003
Jason, thanks for answering my question. I plan to try it tonight. Is
there a formula or spec for choosing bitrate and peak bitrate? Is peak
always 2x the base bitrate?
> > Can someone post their settings or the procedure necessary to reduce
> > the bit rate. I was under the impression that people were getting
> > about 2 GB/h with the pvr-250. Can anyone with a 250 card verify
this.
> Everyone that's mentioned the default bitrate of the wintv-pvr cards
has said
> it's set to VBR 8000 kbps (4GB/hour). You're the only one that's
(wrongly)
> said that they're 2GB/hour at the default bitrate.
> There's stuff in the ivtv driver now to change the bitrate, but it's
going to
> be changing sometime so it's not really worthwhile to support it yet.
>
> Isaac
As for being the only one "wrongly" saying 2GB/hour, I read this before
I started using the project when I was still spec'ing the hardware I
wanted to buy. It's from a HOW-TO draft that was being circulated on
this list. I didn't know that it didn't apply to the pvr-250 and I was
asking for confirmation, not stating a fact.
> 3.3.3 Hard Disk(s)
>
> Encoded video takes up a lot of hard disk space. The exact amount
depends
> on the encoding scheme, the size of the raw images, and the frames per
> second, but a typical value for MythTV is 2 GB/hour. Allow enough
space.
FWIW, the box the pvr-250 plainly states on the left end of the box
"Hardware MPEG-2 video and audio encoder, so you only need 1-2
Gigabytes per hour of recorded video."
Moving on, I want to thank Isaac and company for a great piece of
software.
I just read an article on excite that future versions of ReplayTV will
possibly lose their ability to automatically skip commercials. This
happens to be the major "Wow!" feature when I show people MythTV.
BTW, I would be willing to build, maintain, and host a FAQ page
compiling info on using the pvr-250 with MythTV. Presently, it seems
one has to dig through the list archives or cvs repository to find
basic info. I would like to give back to the project and thought this
might be a useful source for people new to the project wanting to use
this card.
Let me know if I should move forward with this idea. It would need a
link on the MythTV site to be useful.
Thanks,
Vinton
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