[vdr] Re: A/V sync problems with new drivers

["Reinhard Walter Buchner" <rw.buchner@freenet.de>]

Hi Juri,

> Reinhard Walter Buchner wrote:
> > - The ARM 7 is capable of hardware scaling (pg 34) If Mplayer
> > could utilize this capability, it could make a lot of people with
> > low CPU power in their STBs happy. From what I have figured
> > out of Mplayer it doesn't make use of this feature when doing
> > an output via -vo mpegpes. However, this will probably only
> > work with native mpeg 2 input streams ;o((.
 
> I heavn't read the document, so I don't really know, what hardware
> scaling means in this context, but I think, it means the following, what
> mplayer (or better, mplayer.sh) does use:
 
> If you play a video with a resolution of 352x240 (NTSC) or 352x288 (PAL)
> then the ARM does a hardware scaling to the full NTSC or PAL format
> (720x480 / 720x576). It does so also for the width, if the height is
> either 480 (NTSC) or 576 (PAL) and the width is one of the following:
> PAL:  352 480 528 688 704
> NTSC: 352 480 512 640 704

Yes, I know your script does this ;o)) From what I saw in the Mplayer
code, I'm not quite sure if it really does this via hardware. The main
problem with mplayer is that it is so complex (at least if not more
than VDR) and the code is "splattered" all over. There is no way for
*me* to really see if mplayer uses all the hardware capabilities or
not. The AV711x of course can only do this with mpeg2 frames, so
any downscaling (or upscaling) of say a divx film is most likely to
be software based. That is, unless, mplayer (and the whole codec
stuff behind mplayer) converts the divx to mpeg2 first and then scales
it. I really don't know if they do it this way, because, if they scale it
before they convert it, they have less data to process, so this might
be the way mplayer does it, but I *really* truely have no idea.

Greetz,
Reinhard


---
Mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.463 / Virus Database: 262 - Release Date: 17.03.2003



-- 
Info:
To unsubscribe send a mail to listar@linuxtv.org with "unsubscribe vdr" as subject.