Kbtv2 beta2 uploaded
danny at ricin.com
Sat Feb 23 01:21:33 UTC 2008
Alright, one final comment: it's quite possible that USB (even USB2) is so
slow that it kills everything. I don't rule out that possibility.
Just to be complete, I'll quit now :)
On Saturday 23 February 2008 02:10:06 Danny Pansters wrote:
> On Saturday 23 February 2008 01:56:29 Danny Pansters wrote:
> > On Friday 22 February 2008 17:46:42 Dieter wrote:
> > > > Your card seems to have a microtune tuner mt2050 which is not yet
> > > > supported by the saa backend. I'm looking into it. Unfortunately it
> > > > differs from the other generic tuner APIs for saa in that tuning and
> > > > init are to be handled differently (mt2032 is supported by bktr, so I
> > > > can peek there). THis is an important tuner to have support for
> > > > though for several reasons:
> > > >
> > > > - it's on a chip, not in a large chunky metal enclosure
> > >
> > > I have read that the very small USB tuners don't perform as well as the
> > > "large chunky metal enclosure", because some features were left out.
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> > Well, they don't have an mpeg encoder chip, but neither do the old
> > fashioned analog TV cards. Of course, supporting that A/V decoder is
> > another matter. But so is supporting an onboard mpeg encoder.
> And a ATSC or DVB-n dedicated chip that makes the output be a transport
> stream. So in this case that is similar to the encoder step that you have
> with, e.g. a PVR 150. It may be that those chips underperform, I don't
> For analog though, it will probably work fine (the existing kbtv backends
> use very little CPU if using accelerated HW, and there's not any remarkable
> difference between the bktr and saa backend viewers that use the
> conventional "mmap YUV pixels" and the cxm (PVR) backend which is just a
> mpeg2 elementary stream player, 99% equal to ffplay. It creams mplayer
> though ;-P
> Neither need much CPU on FreeBSD, even on non-accelarated platforms such as
> amd64 I'd still guess (based on kbtv1 testing about a year ago), that under
> KDE and normal usage WCPU for kbtv (1 or 2) will be ~20% and that's way
> less than say, amarok. Or any TV app for windows vista I would venture to
> > They seem to use empia chipsets almost exclusively, the variant without
> > onboard MPEG encoder is called the "blackbird" design IIRC.
> > Dan
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