Is possible to enhance the resolution of a FLV

I have downloaded some FLV videos from many sources like Youtube, Vimeo and Daily Motion.
Is it possible to enhance the resolution of this videos to be watched in a HD television?
I have tried the video conversion using flv converter to pass from flv to formats like avi, but the quality is not good.
I think that maybe if i mantain the video fromat is it possible to enhance the resolution and get a better image.
Is there a tool or a flash player that can enhance the resolution of a video downloaded from the web?

Without the original FLA file or video (AVI, WMV etc.) it was created from the answer is... to put it bluntly... no.
One drawback of YouTube downloaders is they are WYSIWYG. They download videos in a FLV format with whatever resolution they are on the site, which is, to keep from taxing bandwidth, low res, and small size. 460 x 320 usually at the most.
Blowing those up to the size of a TV screen blurs them terribly.
By example:
A standard def DVD is 4.3 gigs
An HD DVD is around 7.6 gigs
A "ripped" DVD (AVI) as anywhere from 700Mb to over a gig and a quarter.
A high quality MPEG is about 100MB per minute.
The average FLV downloaded through a YouTube downloader is about 4Mb.
1 Mb per minute vs 100.
The compression that goes into making a video suitable for a site that has billions of views of millions of videos hourly, degrades the qualtiy tremendously to accomodate streaming bandwidth. They have to be made for a 5 inch by 3 inch viewer.

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