These pages need to take input file into account to provide better flags. Maybe what you want is a page that generates shell scripts. + Compress to target nee

These pages need to take input file into account to provide better flags. Maybe what you want is a page that generates shell scripts. + Compress to target needs to know input length, as others have mentioned. Also, usually I would encode in multiple passes to better allocate the bits if I am targeting a specific size. + "Extract audio" shows commands that will reencode the audio stream. If input stream is already in a format that I can use, what I would do is to copy the audio stream without reencoding (`-c:a copy`).