sparaig wrote:
> --- In [email protected], Bhairitu <[EMAIL PROTECTED]> 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.
> 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.
