[opendtv] Re: wm trials at different telcos using wm series
- From: Ron Economos <k6mpg@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Tue, 17 May 2005 16:24:33 -0700
A certain US standards group ran a "golden eye" test between H.264
and VC-1 last year. They tested at HD, SD and sub-SD resolutions.
In all the video sequences tested, H.264 was either equivalent to VC-1
or slightly better than VC-1.
However, my spies at NAB have told me that /all/ of the current H.264
silicon decoders are buggy. Whichever codec you chose, you should
start evaluating decoder silicon ASAP.
Ron
Prashant Desai wrote:
>Hi Kon
>
> Thanks a lot for all the clarification ,
>
> It seems whoever is using wm9 ,most of them claiming that its pretty
>feature rich compared to the advanced codec MPEG-4 AVC , infact somewhere
>I have read that VC1 which is just subset of wm9 deliver the same quality
>video at approx half of the rate at which the mpeg-4 avc delivers the same
>video with same quality ..... and also that VC1's compression mechanism
>automatically gets improved with the increase of the bit rate [ encoding ]
>and thus it can compress data more effectively at higher bit rates ,
>
> I personally have never seen the quality of video for any of these MPEG-4
>AVC or wm9 or VC1 on a TV set at same rate ......
>
> Are there any test results that been published by an independent entity for
>these ? If there is please point me to it, since we really in dilemma
>whether to go with mpeg-4 AVC or with VC1 or with proprietary wm9?
>
> Pls guide me on this
>
>Regards,
>Prashant
>
>
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