[mythtv] Effect of Multi-rec on channel change times....?

Steven Adeff adeffs.mythtv at gmail.com
Thu Jul 12 01:10:54 UTC 2007


On 7/11/07, Daniel Kristjansson <danielk at cuymedia.net> wrote:
> On Thu, 2007-07-12 at 00:36 +0100, Colin Guthrie wrote:
> > Daniel Kristjansson wrote:
> > > Someone may implement the continuous record feature in
> > > future, but implementing such a feature would in some
> > > ways have been easier to implement before multirec and
> > > no one ever bothered to do it, so I wouldn't bet on it.
> > > (You just record as many other streams as your hardware
> > > allows into small ring buffers and use them to initially
> > > fill up your recording file when you switch to that
> > > channel, then there is no need to wait for buffering
> > > since you already have a few seconds of video..)
> >
> > Interesting.... Do you know if this is how VDR or commercial set top
> > boxes do it?
> I don't know. All STB's I've used had pretty darn awful
> channel changing speed considering that they don't need
> to do the buffering that a PVR does. A trick some of them
> use is to start decoding the audio before they see a GOP
> and start displaying video; which indicates that they don't
> do this. We could do that trick fairly easily if we wanted
> to in the multirec branch, but only because I patched the
> avformatdecoder there do handle audio only files. STB
> firmware doesn't have to work with the variety of hardware
> that MythTV does; when I set a timing threshold for something
> in MythTV I find a value that works on all my machines
> then double or triple it (or if all it will cause is a
> temporary glitch and it is critical that it is low, I add
> 30% and try to get as many people as possible to test it).
> Comparing ourselves to VDR, BeyondTV, etc, is more realistic.

or soon, the Tivo written software for Comcast's motorola boxes?

something that looks rather interesting, I wonder how they will use
the poor processing and memory limitations.


> > I'd love to see this in Myth - it would make it really rock for live tv :)
> > That said I rarely watch live tv anyway :p
> And that's why this hasn't been implemented :]

-- 
Steve
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