[opendtv] Re: AVC realistic bitrates?
- From: Tom Barry <trbarry@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Wed, 08 Jun 2005 20:52:47 -0400
AVC 720p at only 3 mbps would likely pushing it a bit for most
moving video and 1 mbps out of the question based upon the little
I've played with it. But AVC is still pretty darn good based upon
a number of improvements, not just on a large GOP size.
- Tom
Manfredi, Albert E wrote:
> Bob Miller wrote:
>
>
>>You focus on the h.264 3000 and compare to the MPEG2 at
>>10,000.
>
>
> Yes, that was the point. Is AVC three times better than
> MPEG-2, for TV-quality images?
>
> And again, Ron makes an excellent point which seems to be
> overlooked often. What makes AVC more efficient, in large
> measure, is that interframes don't need to be transmitted
> as often. But not transmitting interframes as often has
> an impact on how fast one can lock onto a stream. So it's
> very important to assign the GOP as required first,
> before comparing quality vs bit rate.
>
>
>>As someone trying to do something with this I focus on
>>the h.264 at 1000 compared to MPEG2 at 10,000 and say
>>did someone make a mistake?
>
>
> That would be a mistake. My first question is why don't
> you compare MPEG-2 at 1 or 2 Mb/s compared with AVC at
> those rates? And my second question would be why you
> expect to derive anything of value about quality at the
> higher bit rates from this? After all, just because AVC
> at 1 Mb/s looks okay, this proves nothing about AVC vs
> MPEG-2 at higher bit rates.
>
>
>>I will take the tradeoff anyday and any broadcaster in
>>their right mind would also.
>
>
> You must be joking. There's no way the 1 Mb/s examples
> qualify as HD. Maybe we should compare with SD MPEG-2
> images. Without further info, I can believe that AVC at
> 1 Mb/s compares favorably with MPEG-2 at 2 Mb/s, maybe
> even 3 Mb/s. AVC is supposed to hold up very well at the
> low bit rates, unlike MPEG-2 which falls apart below
> ~1.5 Mb/s.
>
> Bert
>
>
>
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