This is exactly how DVD playback protection was first defeated when DVD's came out. I remember hacks of Playback software that automated pausing the film and doing single frame advances with screen captures.
The resulting frames where then sent straight to a MPEG2/ MPEG4 encoder so a compressed version can be generated.
The sound would be interleaved later with the compressed video AVI container by playing back the movie at normal speed and capturing the sound by looping the line out of the sound card into the line in and using a standard audio recorder program.
It's is very funny to see after years of development that a work around that was used 10+ years ago on DVD still works today.
Yes there are artifacts and noise but if you are taking the 20+ Gb source and compressing to ~4 Gb of MPEG4 then you would be hard pressed to tell where the artifacts were coming form compared to a "pure" digital trans code.
“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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This is exactly how DVD playback protection was first defeated when DVD's came out. I remember hacks of Playback software that automated pausing the film and doing single frame advances with screen captures.
The resulting frames where then sent straight to a MPEG2/ MPEG4 encoder so a compressed version can be generated.
The sound would be interleaved later with the compressed video AVI container by playing back the movie at normal speed and capturing the sound by looping the line out of the sound card into the line in and using a standard audio recorder program.
It's is very funny to see after years of development that a work around that was used 10+ years ago on DVD still works today.
Yes there are artifacts and noise but if you are taking the 20+ Gb source and compressing to ~4 Gb of MPEG4 then you would be hard pressed to tell where the artifacts were coming form compared to a "pure" digital trans code.