[opendtv] Re: News: ATSC 2.0 and H.264 at HPA

Kon Wilms wrote:

>> "All of them performed very well and the 50% gain has been
>> reached," said Hoffman. "With some content it is even better
>> than 50%."
>
> Waiting for Bert's comments on the above. Chuckle.

Hey Kon, I'll happily oblige.

The piece says:

"In terms of bandwidth needed for "critical material but not unduly so"
performance recommendations are: 10.5 Mbps for 720p/50; 12.1 Mbps for
1440 X 1080i/25; and 12.8 Mbps for 1920 X 1080p/25."

(I corrected what appeared to be typos. The 440 vs. 1440 and the
question marks.)

So, am I to understand that with MPEG-2 compression, you need at the
very least:

21 Mb/s for 720p/50 (or 60)
24.2 Mb/s for 1080i
25.6 Mb/s for 1080p24 (or 25)

The fact is, fully granting that the end results might not be as good,
that MPEG-2 compression is commonly used for the formats listed above at
rates very close, if not identical, to those quoted as H.264
recommendations. Take PBS stations with their one HD and three SD
streams, all in 19.2 Mb/s. How much would the HD streams get, on
average?

The 50 percent improvement achieved with H.264 does not translate to
"can't be done with MPEG-2 at those same rates."

Bert
 
 
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