AVS Forum Special Member
Join Date: Dec 2004
Location: Waynesville, NC
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It's been a couple months.... I'm happy with this version...
Have seen the reports of motion blur, and, looking at OTA, the only thing I'm seeing is transcoding artifacts when transcoding 720p into 1080i.
At work, I routinely do transcoding, and what I'm seeing on the 73640 is not any worse that what I see on broadcast gear... doing same thing.... (Actually it's easier to transcode 1080 to 720 than the other way around... My older Mits 62525 did a better visual transcode to it's native 720P that our current 73640 does on 720 to 1080, which isn't a bang against Mits, it's just that it's harder to cross-convert Up than cross-convert Down.... Even broadcast gear has this problem...).
One last comment, though I don't have any way of comparing or testing it..... Our 73640 is 1080p, so even 1080i will be transcoded... I have no work experience with that format -- 1080P, because it is not a broadcast format, just a display format.
There will obviously be a transcode to display 1080i on a 1080P display... Other than Known Test Signals (Such as Moving Zone Plate) I know of no way to test this.... But our DLP does not have an HDSDI Input, so any step I try (And I have created a BluRay H.264 @40Mb/sec to test this).... But, even my Highest bandwidth test involved multiple transcodes: (HDSDI to format for editing: Apple ProRes, Avid 145/220, Various Quicktime or other formats), and still another to BR format (MPEG2 or H.264)....... So my best BR disk is even suspect.
So, we're left with a 19Mb stream for OTA, or a 40Mb stream for BR.... That contains what started out life from a live camera at 2Gb/sec data, and that may have been compressed at one point or another to 260Mb/sec in an ASI stream somewhere along the way..... From the remote to the Uplink, to the Downlink, to the TV Station, through Framesync and processing gear, back through MPEG Encoders, to transmitter to our OTA antenna and DLP Tuner....
Toss in a compression or two via cable/satelite company.... And we are trying to determine Motion Blur without a HDSDI input and HDSDI Test Signal Generators ??????????????????
You should see what Moving Zone Plate test signal does to gear!!!
All we are left with is our eyes..... We were shown something by thhowl, who had the determination to report it and see it getting fixed.
Thank you, thhowl!!!
There may be other artifacts... There Probably Are!!! (Just like there are artifacts in Broadcast gear)
Hopefully Mits has learned from thhowl, and will have the expertise to improve on their products...
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