mpeg2 vs mpeg4 again and again...

[Spyn]

if we take some very high quality sources, better than mpeg2 at very high bitrate (dvd source)

fisrt question ? is sources like that exist ? which codec is able to that ?

now compress these sources with mpeg2 codec and mpeg4 codec (xvid ? is there another better mpeg4 codec ? i except new mpeg4 like h.264) with a very high bitrate 5000 or 10 000 kbits/sec average or more

second question : which will give the better quality and why ?

[killingspree]

it's late so this is only a short version of my intended answer ;)

mpeg2 will most likely give you a better quality at those high bitrates, especially if you exclude mpeg4 avc codecs. mpeg2 is simply better suited for high bitrate encodes (see DVD) as mpeg4 asp codecs (xvid & co)

but anyway, your question is very vague so i do not really know what you want to here, or what you inted to use it for...

kr
steVe

[Spyn]

Originally posted by killingspree
it's late so this is only a short version of my intended answer ;)

mpeg2 will most likely give you a better quality at those high bitrates, especially if you exclude mpeg4 avc codecs. mpeg2 is simply better suited for high bitrate encodes (see DVD) as mpeg4 asp codecs (xvid & co)

but anyway, your question is very vague so i do not really know what you want to here, or what you inted to use it for...

kr
steVe

no use, i just want to know if mpeg2 is better than the better mpeg4 codec (except mpeg4 avc codecs) at very or extremely high bitrates for about 90 % of the sources.

i think mpeg2 is better but another person on another forum think mpeg4 is better so i just want to know who is right and if possible explain why :)

thanks for your answer and sorry for my bad english ;)

[SeeMoreDigital]

In my opinion, both codecs have the capability of offering the same looking encoded images!

However, the Mpeg4 codec should be able to do this at much lower bit-rates than Mpeg2.

Indeed, it might be useful if somebody could compile a bit-rate "top-out" test for each codec, when generating encodes from the same source at the same resolution.

Given the source, I think it's logical to assume there has got to be a limit at which, adding extra bit-rate make no visual difference to the encode.


Cheers

[Spyn]

Originally posted by SeeMoreDigital

Given the source, I think it's logical to assume there has got to be a limit at which, adding extra bit-rate make no visual difference to the encode.



using xvid or divx, this happens when a source is very compressible, increase bitrate don't increase quality and size cause the codec is already giving the maximum quality that it could give.

but this quality is not the same as the original, that's why i think mpeg2 is better at very high bitrates.

[SeeMoreDigital]

Hi Spyn,

I presume you only have access to Mpeg2 sources?

If so, you will be unable to make an accurate enough comparison. Because you are comparing your Mpeg4 encode, directly against your Mpeg2 source!

In fact, you would obtain more accurate results if you generated say, an Mpeg2 encode from your Mpeg2 source. And then compared the Mpeg2 and Mpeg4 encodes against your Mpeg2 source!

You should then discover that different Mpeg2 encoders are capable of generating different looking encodes... In much the same way different Mpeg4 encoders do!

Meaning... it's very difficult to determine, which codec is better than the other!

And as a side note, for all people living in Europe who are thinking of watching high-def TV (when it comes out). It looks like we will only have a choice of seeing Mpeg4.... So Mpeg2 seems to be on it's way out already ;)

By the way. I hear France will be launching a DVB-T (Terrestrial) service. Are you thinking of buying into it?


Cheers