[opendtv] Re: 20040722 Thundering Thursday Thanks (Mark's Mon day Memo)
- From: "John Willkie" <johnwillkie@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 22 Jul 2004 21:09:02 +0100
I noticed with KPBS that -- despite what the spec says about transport
priority not being included in the ATSC world -- that they have transport
priority with their four elementary streams. I sort of wondered about that:
both hd and sd have priority? That takes up 87% or so of their transport
capacity. Null packets bring it up to 96 or so percent, so metadata has
second place.
John Willkie
-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx
[mailto:opendtv-bounce@xxxxxxxxxxxxx]On Behalf Of Kon Wilms
Sent: Friday, July 23, 2004 3:17 AM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: 20040722 Thundering Thursday Thanks (Mark's Mon
day Memo)
4Mbit is pretty high for an SD feed. 3-3.5 should be more than enough.
I'm not sure what encoder and mux youre using, but there are some that
let you prioritize your HD VBR at the MUX in order to squelch the SD
feed if it is being bitrate starved.
Cheers
Kon
GaryBliev@xxxxxxx wrote:
> Personal example: We went on the air with DT in January. We could only
air
> the PBS national HD feed. They encode video at about 16-17 mpbs. So, when
we
> only aired them, the bit rate was 16-17 mpbs.
>
> After we were able to get our encoders working, we bit rate reduced to
> 13.3mpbs for the HD to make room for a 4mb SD service. Shortly afterward
we also
> converted the 1080i to 720p.
>
> So, the HDTV we have now is not the HDTV we had in January.
>
> We now have stat-mux enabled, so our HD bit rate is now varying between 11
> and 17 mbps. But we're still at 720p.
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