[vdr] Re: vdr at dbox2

[Klaus Schmidinger <Klaus.Schmidinger@cadsoft.de>]

Carsten Koch wrote:
> 
> Andreas Oberritter wrote:
> > On Fri, 2004-02-27 at 23:30, Carsten Koch wrote:
> ...
> >>Note that VDR does know the file offsets of all I-frames
> >>(that information is stored in the index.vdr file), so it
> >>would only have to read I-frame data over the network for FF/FR.
> >>How big is a typical I-frame?
> >>At 10 Mbit/s and 25 I-frames per second the theoretical
> >>maximum size would be < 50 kilobytes.
> >>If I-frames can get larger than that, one might play back
> >>every (Nth) I-frame twice.
> >>Does any of that sound realistic to you?
> >
> >
> > Isn't that still picture display what you're describing? You can do that
> > for sure, but that's not fast forward etc. at driver level. You would
> > need to implement the still picture ioctl()s though.
> 
> I agree it's not fast forward etc. at driver level.
> Would it really require still picture ioctls?

I don't think so - after all, VDR just sends I-frames in FF/FR mode
and it works just fine (with FF DVB cards, that is).

> If I simply feed I-frames as fast as I can and if there is an
> I-frame every 12 frames, would that not give 12xFF without further ado?
> If the network is not fast enough, it might become less than 12xFF,
> but it would still be FF.
> One could do every other I-frame and get up to 24xFF, etc.
> depending on the network speed, right?

That would be my assumption, too (of course, I have no experience
with the dbox2, but I would assume that it should replay a sequence
of I-frames resulting in FF/FR).

Klaus


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