[mythtv-users] How will changing from 480x480 to 720x480 affect me?

[jim scott]

On 11/30/06, Jeff Simpson <jeffsimpson at alum.wpi.edu> wrote:
>
> > Hmmm, conflicts with Jim's response...
> > Can you post your file sizes for a 1 hour show?  Mine are 2.2GB each
> > at 480x480, all other defaults on my PVR-500.
>
> I record everything at 720x480 on a PVR-350, and I'm at about 2.2 gigs
> an hour as well.
>
> VIDEO:  MPEG2  480x480  (aspect 2)  29.970 fps  6000.0 kbps (750.0kbyte/s)
>
> VIDEO:  MPEG2  720x480  (aspect 2)  29.970 fps  6000.0 kbps (750.0kbyte/s)
>

bitrate x length of recording = file size. Changing the resolution won't
directly affect file size. I think a higher resolution allows you to make
better use of a higher bit rate. Put another way, a higher resolution
requires a higher bit rate to produce a better picture.
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