[MPlayer-dev-eng] Re: [PATCH] further dvr-ms playback improvements

[Trent Piepho]

On Wed, 1 Nov 2006 sci-fi at hush.ai wrote:
> On 2006-11-01 06:05:38 -0600, Trent Piepho <xyzzy at speakeasy.org> said:
> > On Wed, 1 Nov 2006, Nico Sabbi wrote:
> >> the frame time doesn't depend on the progressiveness/interlacing
> >> of the video, but on the framerate. For some time now, for some obscure
> >> reason,
> >> many american broadcasters have been transmitting ntsc content
> >> tricked (changing the repeat-* in the sequence headers) so as to make
> >> the video stream look like encoded ad double the framerate.
> >
> > Broadcasters stick with one resolution/framerate all the time.  They don't
> > switch back and forth from commercials to programs, video source to film
> > source, native HD to up-convert, and so on.
>
> ummm... I have hundreds (yes I do) of recordings based on
> the FireWire SDK sample apps provided by Apple.  I _have_
> seen digital SDTV channels switch framerates for commercials
> etc. as you say.  Several series are sourced from videotape
> at 30fps (let's forget fractions eh? ;) ), so when a
> commercial comes on that's shot on film, we see it switch to
> 24fps.  And vice-versa when the show is film and a
> commercial is on tape.

Do you have a sample ATSC recording that switches framerate?