--- In [email protected], Bhairitu <[EMAIL PROTECTED]> wrote: > > sparaig wrote: > > --- In [email protected], Bhairitu <noozguru@> wrote: > > > >> 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. > >> > > > > Sigh. No, the major difference between MPEG-2 and MPEG-4 is the purpose for > > which the > > two standards were designed. MPEG-2 is a standard for a relatively simple > > multi- channel > > audio-visual presentation, while MPEG-4 goes lightyears beyond that, > > potentially > > incorporating all sorts of things besides multi-channel video and audio. > > > That kind extensibility the SV folks are always suggesting or putting > tags into formats. Then no one uses them. Do you know of anything that > uses the MPEG-4 format for anything other than AV? I don't.
Apple? > > And which AV forum do you want to move this discussion to? > > > I'm through discussing this with you. The forums were for your edification. >
