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Old 01-22-2008, 08:54 PM
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Default question about deinterlacing

ok so i have heard people say that deinterlacing is bad on the A20 and it's better to output 1080i and let the TV deinterlace, but all HD DVDs are encoded at 1080p so shouldn't it just pass that 1080p onto the TV without having to deinterlace?
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Old 01-22-2008, 09:00 PM
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yeah if the player outputs 1080p and the tv accepts 1080p there will be no deinterlacing at all IF it is a FULL 1080p set.
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Old 01-22-2008, 09:14 PM
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yeah if the player outputs 1080p and the tv accepts 1080p there will be no deinterlacing at all IF it is a FULL 1080p set.
ok thats what i thought, why do people complain about the A20s deinterlacing there is probably only like 5 titles at 1080i
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Old 01-23-2008, 12:41 AM
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Originally Posted by squall4008 View Post
ok so i have heard people say that deinterlacing is bad on the A20 and it's better to output 1080i and let the TV deinterlace, but all HD DVDs are encoded at 1080p so shouldn't it just pass that 1080p onto the TV without having to deinterlace?
I don't remember the full details of the process, but the disc is encoded at 1080p. The player reads it in at 1080i and then has to deinterlace to send it out at 1080p to the TV.

If the 1080i deinterlace is done properly, then the original 1080p encode is fully reconstructed with no degradation. Unfortunately, the A20, A30, and A35 have a flaw in the deinterlacing. The XA2 has proper deinterlacing thanks to the Reon chip.

There are threads over at AVS that explain this much, much better than I can.
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Old 01-23-2008, 01:19 AM
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Found the part I was leaving out.

The movies are encoded at 1080p 24 frames per second (majority) or 1080p 30 frames per second.

The player reads in the 1080p 24 or 30 signal and then converts it to 1080i at 60 frames per second. The 1080i at 60 signal is then deinterlaced to produce 1080p at 60 frames per second for output to 1080p capable HDTVs.

Some of the newer HDTVs with the 120Hz processing can accept 1080p at 24 frames directly. For those lucky owners, they can set the A20, A30, A35 or XA2 to output directly at 1080p/24 which will pass the signal directly from the disc unprocessed to the HDTV.
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Old 01-23-2008, 08:27 AM
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QUOTE=telamon;673562]I don't remember the full details of the process, but the disc is encoded at 1080p. The player reads it in at 1080i and then has to deinterlace to send it out at 1080p to the TV.
There are threads over at AVS that explain this much, much better than I can.
I have never read about this, but maybe it is true. I will certainly now ask some others if this is indeed what happens because I have never read anything about this being the case with 1080p material. I am certain Josh Z knows if this info is accurate.

EDIT: after reading the above post ^^^^^^^^^^^^^^this explanation sounds more plausible.
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Old 01-23-2008, 10:13 AM
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i'm going to set it to output 1080p24 and let my TV do the 3:2 pulldown, that sounds like the best option
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Old 01-23-2008, 09:17 PM
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Originally Posted by squall4008 View Post
i'm going to set it to output 1080p24 and let my TV do the 3:2 pulldown, that sounds like the best option
Unfortunately the TV in your sig can't handle 1080p/24 input so the HDMI handshake will fall back to 1080p (1080p/60). Set your player to output 1080i and compare it to 1080p. Leave it at whatever you think looks better.
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Old 01-23-2008, 09:42 PM
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Originally Posted by telamon View Post
Found the part I was leaving out.

The movies are encoded at 1080p 24 frames per second (majority) or 1080p 30 frames per second.

The player reads in the 1080p 24 or 30 signal and then converts it to 1080i at 60 frames per second. The 1080i at 60 signal is then deinterlaced to produce 1080p at 60 frames per second for output to 1080p capable HDTVs.

Some of the newer HDTVs with the 120Hz processing can accept 1080p at 24 frames directly. For those lucky owners, they can set the A20, A30, A35 or XA2 to output directly at 1080p/24 which will pass the signal directly from the disc unprocessed to the HDTV.
I have to correct you on the last part of your post. The A2, A20, A3, A30, and A35 all process the HD media at 1080i, and the ones that out put 1080p do so by deinterlacing. That is why when those tested were receiving bad reviews on doing right what they are suppose to be doing, 1080p. Only the XA2 processes and passes through a "true" 1080p signal not deinterlaced and does it "right".
If your TV does deinterlacing well then it doesn't matter which player you use and a good 1080i signal will do. The A30 in my opinion is the best one for the money. Third generation has a slight edge on picture over 2nd generation, but when it comes to audio the 2nd has better audio due to a faster bitrate output. I have had full comprehensive talks with Toshiba techs on this subject in order to find out what I needed to match any blu-ray output for my theater. The lower end Toshiba's just were not matching my expectations and couldn't understand why. Hope this clears it up for some.
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Old 01-25-2008, 12:46 PM
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wow! very interesting info Time.
I learn something new every day on here.
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