[opendtv] Re: Get rid of Interlaced Media?
- From: Mark Schubin <tvmark@xxxxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Tue, 23 Jan 2007 12:51:41 -0500
I'm no fan of interlace, but I think you may be protesting a bit too much.
At rates of 40 to 50 Mbps (or beyond), MPEG-2 Main Profile is
essentially transparent to interlaced SDTV; at 200-300 Mbps, the same is
true of HDTV.
I'm currently in the middle of the Metropolitan Opera's HDTV
cinemacasts. We've been shooting 1080i29.97 (per the request of our
U.S. theatrical distributor) and compressing it down to under 20 Mbps.
It's been blown up to cinema-sized screens around the world (Japan is
getting a 57 Mbps feed), sometimes after decoding, standards conversion,
and re-encoding.
What rate are you trying to use?
TTFN,
Mark
dan.grimes@xxxxxxxx wrote:
I have been working on a project that requires transforming our
interlaced video into MPEG-2 files. I know I'm stating the obvious,
but compressed interlaced media looks much worse than progressive
pictures in the MPEG-2 format no matter what encoding program I use.
And de-interlacing the video makes it much worse. When all the
planning went into the ATSC formats, was the way the formats would be
compressed and the resulting quality ever considered?
With the way display technology and compression processing is
developing, is it possible to get rid of interlaced media in the near
future, or are there other functions to consider? I suppose the only
way to get rid of the interlaced media these days is produce in 720p.
Is it reasonable to produce in 1080 30p (if you aren't doing sports)?
I don't see enough production technology yet to produce completely in
1080 60p.
In the mean time, is there any way to deal with interlaced video in
the ATSC and MPEG world?
By the way, whatever the free Windows Media Encoder does to
de-interlace the video, it works much better than the dozens of other
encoder software I've tried that cost $60 to $2000. Perhaps the AVC helps.
Dan Grimes
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