You can try superzoom.

Prog wrote:You can try superzoom.

and what about the best codecs to get the best picture quality ??!!

thanks for your answer

This depends on your hardware, like graphics chipset, CPU power, plus DirectDraw version and more.

BTW, codecs have internal settings, regarding post processing of any kind.
And also your screen may matter, and the way it's connected.

Regarding screen scaling, there are several ways to do this. Each one has it's benefits and problems.
Like, expanding horizontally will give fat looking heads and bums...
Cutting away top and bottom will make you lose parts of the picture content.
A pseudo intelligent content sensitive variable scaling may work for some scenes, but turn into funny crap on others.
What's not transmitted can't be shown, just imitated...

Thanks a lot for your help but i think that the channels should go for wide screen 16:9 instead of 4:3 ...

Well, you can't really force them.

More and more stations are moving to wide screen transmissions these days, studios as well. But transferring old material throughout the archives requires quite some effort and man power.
For example, cutting away top and bottom may remove important content on some scenes. Stretching instead may give egg heads.
"Letter boxing" on the sides may often be the better way, but then, what to do with original 4:3 letterbox content? Pillow box would then lead to quite small picture on every screen.

There may as well be copyright reasons, to keep AR. It may be illegal or against licenses, to change a piece of art work in aspect ratio or any other way. Same goes for other 3rd party material, like if a station logo was placed in the letterbox area and has to be kept.

All together, this can't be done automatically in every case. And that's the point, where money talks...