[mythtv] [PATCH] DTVRecorder::HandleKeyframe - SetPositionMap/Delta

[John Patrick Poet]

On Wed, 29 Dec 2004, Taylor Jacob wrote:

> > While a ringbuffer is still necessary to prevent the overruns, this fix does
> > mean that the ringbuffer size can be much smaller.  In a preliminary test, I
> > saw a maximum of 4.7MB used after an hour of recording three shows.  These
> > shows were just upconverts and not true HD, but that is promising.
>
> What difference does it make if its an upconvert or not?  Since you are just
> saving the mpeg streams it doesn't care about what format it is in.  If the
> content was (foolishly) upconverted to say 720p or 1080i it would be just the
> same as if the content were true 720p or 1080i.  The bandwidth usage should be
> the same, so I don't understand what you are getting at..
>
> Taylor


I *think* my local stations send out a lower bitrate when broadcasting
non-primetime programming, but I could be wrong.

The upconverted shows are not stretched.  They are pillar boxed.  That much
black area should be easily compressed, so I assumed that the station would
dial down the bitrate....


John