[opendtv] Re: Video compression artifacts and MPEG noise reduction
- From: Albert Manfredi <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Sat, 14 Jun 2008 17:35:19 -0400
Craig Birkmaier wrote:
>> It's useful also for broadcasters who want to transmit
>> more multicasts, or to reduce the artifacts in the multicasts
>> they transmit now.
> I do not understand how this could be of use.
>
> This is a post processing technique
No, it's not just that. Read again their web site. Let me quote the parts you
missed:
---------Begin-------------------
http://www.algolith.com/products/index.html
Solutions for Broadcast & Professional Markets
Algolith offers a series of products, called Algogear™, which are designed to
significantly improve the way broadcast, post production, cable, satellite and
IPTV service providers deliver digital video content to their viewers and
subscribers.
IP Solutions for Original Equipment Manufacturers (OEM)
The Algolith portfolio of IP Solutions can be used for FPGA and ASIC
implementation, and are applicable to a wide range of industries including
post-production, professional, CE equipment, Home Theatre, telecommunications,
IPTV and VOD.
----------End--------------------
As you can see from the above quote, they are addressing both ends of the
distribution chain. The transmission side AND the receiver. The product I
quoted from earlier was from their broadcast products:
----------Begin-----------------
The VNR-1000-HD dramatically increases picture quality and/or reduces bandwidth
requirements for delivering content through cable, satellite, terrestrial
networks, and IPTV delivery platforms.
----------End--------------------
"... increases picture quality and/or reduces bandwidth requirements for
delivering content through cable, satellite, terrestrial networks ..."
So, given that most broadcasters create their own multicasts, rather than
simply rebroadcasting a ready-made 19.39 Mb/s stream from a network feed,
individual broadcasters could put such a product to good use.
> In virtually ALL cases, the quality of the feeds that go into a
> stations multiplex are not the problem; the feeds are typically
> uncompressed (either physical media or satellite feeds), or
> lightly compressed contribution feeds.
>
> The problem is that the station must apply considerable
> compression to these feeds in order to make them fit into
> the multiplex.
Exactly, Craig. You said the right words, but then you drew the wrong
conclusion, missing what makes this clever.
> Most commercial MPEG-2 encoders DO include noise
> reduction and pre-filtering that operates in closed loop with
> the encoder. If the encoder is stressed, the low pass filter
> is used to reduce encoder stress.
And they specifically addressed this, Craig. They are pre-processing in a more
clever way than merely low-pass filtering.
Why should it be so hard to believe that with higher speed processors, the
encoding of MPEG-2 (H.262) can be improved? It seems totally believable that
whatever pre-filtering MPEG-2 encoders have been doing can and will be made
more clever.
I'm not saying that Algolith has the only answer. I'm saying that this is an
on-going process, and Algolith has brought it to the forefront, with what might
be the most advanced solution as of today.
Bert
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