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Re: WSS reloaded
by Nicolas Boullis
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Hi,
On Thu, Apr 24, 2008 at 05:43:29PM +0200, Jan Willies wrote:
>
> It seems to work though. Quite cool, although the VDR-OSD looks a bit
> weird on 16:9 TV stations. Hopefully the next dxr3-plugin resolves that
> issue.
It does not work, this is only the result of my "scale-n-crop" work...
Natively, the EM8300 chip is able to compress the image vertically to
display a 16:9 stream on a 4:3 TV set.
I think this is very restrictive, so I decided to do that work to add
the ability to compress the image horizontally (to display a 4:3 stream
on a 16:9 TV set), and also the ability to crop the image
(especially useful when black borders are added around a 16:9 video to
form a 4:3 stream, or around a 4:3 video to make a 16:9 stream).
While the "native" compression only compresses the video and leaves the
SPU untouched (VDR's OSD uses SPU), my code also affects the SPU. Hence,
you got the SPU compressed, which makes it quite ugly.
I don't think it is possible for vdr's dxr3 plugin to work aroud this.
It's even worse when the image is cropped, since OSD gets cropped as
well. But there, I think it should be possible to work around that issue
in the plugin.
I think the point behind WSS is to avoid performing any scaling or
croping on the em8300 chip, which would mean a better image quality.
Note that WSS is not the only way to switch a TV set between 4:3 and
16:9 modes. Pin 8 of the SCART connector can be used for the same
purpose, and I'm willing to build some home-brew hardware to achieve
such automatic switching.
It might be possible to do much better by hacking the firmware, but as
far as I know, no-one could reverse-engineer it yet...
Cheers,
Nicolas
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On Thu, Apr 24, 2008 at 05:43:29PM +0200, Jan Willies wrote:
>
> It seems to work though. Quite cool, although the VDR-OSD looks a bit
> weird on 16:9 TV stations. Hopefully the next dxr3-plugin resolves that
> issue.
It does not work, this is only the result of my "scale-n-crop" work...
Natively, the EM8300 chip is able to compress the image vertically to
display a 16:9 stream on a 4:3 TV set.
I think this is very restrictive, so I decided to do that work to add
the ability to compress the image horizontally (to display a 4:3 stream
on a 16:9 TV set), and also the ability to crop the image
(especially useful when black borders are added around a 16:9 video to
form a 4:3 stream, or around a 4:3 video to make a 16:9 stream).
While the "native" compression only compresses the video and leaves the
SPU untouched (VDR's OSD uses SPU), my code also affects the SPU. Hence,
you got the SPU compressed, which makes it quite ugly.
I don't think it is possible for vdr's dxr3 plugin to work aroud this.
It's even worse when the image is cropped, since OSD gets cropped as
well. But there, I think it should be possible to work around that issue
in the plugin.
I think the point behind WSS is to avoid performing any scaling or
croping on the em8300 chip, which would mean a better image quality.
Note that WSS is not the only way to switch a TV set between 4:3 and
16:9 modes. Pin 8 of the SCART connector can be used for the same
purpose, and I'm willing to build some home-brew hardware to achieve
such automatic switching.
It might be possible to do much better by hacking the firmware, but as
far as I know, no-one could reverse-engineer it yet...
Cheers,
Nicolas
-------------------------------------------------------------------------
This SF.net email is sponsored by the 2008 JavaOne(SM) Conference
Don't miss this year's exciting event. There's still time to save $100.
Use priority code J8TL2D2.
http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone
_______________________________________________
Dxr3-devel mailing list
Dxr3-devel@...
https://lists.sourceforge.net/lists/listinfo/dxr3-devel
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