sparaig wrote: >>> <snip> >>> >>>> Answer me this: what is the primary difference between MPEG-2 and >>>> MPEG-4? It's a very simple engineering idea which overcomes a >>>> limitation of MPEG-2 and in itself gave MPEG-4 (also h.263) more >>>> compression. >>>> >>>> >>>> >>> The primary difference between MPEG-4 and MPEG-2 is NOT the compression- >>> decompression algorithm (codec). That's just crazy. I.. mean... >>> literally... crazy. >>> >>> >> Nope, on the average an MPEG-4 file compresses about 1/3 the size of >> MPEG-2 and you can use a lower bitrate. The first comparison I found >> was unlike MPEG-2 you could have one frame repeat as much as 300 times >> without repeating that frame in the file. If you have a static title >> image that saves a lot of space in the file. That's just one simple >> difference in the GOP structure and of course there is a lot more. >> > > Er, um.... That's NOT the primary difference between MPEG-4 and MPEG-2. > That's a > relatively minor difference. If that was all that was important, they could > have come up > with MPEG-2 rev B or something. > No, the major benefit between MPEG-2 and 4 *is* the compression. Having flexibe GOP structures really helps compression. The rev was MPEG-4. I would recommend "Video Demystified" 4th Edition by Keith Jack as a reference. Or maybe you ought to spend less time on FFL and more time on some AV forums.
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