I have MPG videos (some MPEG 1, some MPEG 2). They are 16:9 but many years ago I converted them to 4:3. Stupid idea. All peoples are too thin
I'd like to chane aspect back without re-encoding.
I found program called DVDPatcher .
But when using option First header only program changes nothing.
there is option Entire file . Is it doing re-encoding or not?
(photo from videohelp.com)
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Well according to your screen, your video was already 16:9
Are you certain you converted to 4:3 or simply not playing them correctly.
And yes my videos are 4:3 (checked with media info)
Avidemux, but I must give some videos for aunt, and she has old TV which not support mkv, and mp4 format not support MPEG1/2.
P.S. On my TV it's playing correctly so maybe on her TV will be playing also.
DVDPatcher cannot do any encoding, it can only modify flags.
"Entire file" means it will modify/patch not only the header of the first GOP in a file but rather the header of every GOP within the file.
So if you "converted" those video files years ago from 16:9 to 4:3 in the same manner – by patching the flags – this will undo that without quality loss. If however you messed with the aspect ratio in some other way, this may not be able to fix it, depending on what exactly happened.