1. AFAIK the .ty files are basic MPEG2 files with some extra header information. You can convert these back to mpeg files using Tytools (it is a very quick process)
Then you have basic MPEG2 files that you can do what you want with.
Dont forget that these files are already compressed via the Tivo, so they are certainly not uncompressed.
2. When recording to the Tivo also select "best quality" to maintain "best quality" thats about all you can do. There are a few ways to extract it but the outcome is the same, your basically copying the .ty file from the Tivo to your computer. There isnt any degredation in this process, infact you can even copy the files of the tivo using FTP via mfs_ftp (google for more info)
3. cant help you on that.. only dealt with 4:3 myself.
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