On Wed, May 11, 2005 at 01:45:33AM -0700, Joe Barnhart wrote: > Thanks for your response, Scott. I'd really like to see a good > description of the MPEG2 format and its variations (PS, ES, TS, etc.). > Even if the "translator" has to decode the macroblocks, wouldn't it > still save time if it could use the same key frames and not have to > choose the frames from scratch, like encoders normally do?
The transport stream encodings are just wrappers and not relevant to your question. While it is possible, in theory, to write a re-encoder that takes advantage of compression hints learned from the original encoding, that sounds like a lot of work for a rare task just to save some CPU, and CPU is cheap in such instances anyway. We're also rapidly moving to a time when we won't want traditional DVDs. They are small and low-res, and mp2 isn't nearly as good as mp4. Plus, since all of us have computers connected to our TVs, and soon more and more people will, going to the player's restricted format becomes less appealing. I know your friend wants to watch it on his TV. Most would probably say it's easier to either eat the CPU to make it, or tell your friend to watch the disk on a computer at much higher quality than it would be to to write such a complex mpeg re-encoder for a dying format.
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