BDP-83 24hz Output FAQ
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Latest revision as of 11:15, 23 July 2010
What is 24hz output?
Can I use 24hz output?
Only if your display accepts a 1080p24 signal; check your display documentation. You should also verify that your display supports 1080p24 signals at multiples of 24hz. Some displays accept a 24hz signal but convert it to 60hz, which reintroduces the motion artifacts.
How to check this yourself:
- Set explicit 1080p HDMI output in the OPPO with 1080p/24 OFF.
- Play any normal, Blu-ray movie shot on film that has the typical, vertical credits scroll at the end. Scene select to the closing credits. Observe closely the vertical upwards motion of the credits.
- Now switch the OPPO to 1080p/24 Auto. Check that the front panel shows the OPPO as switching to 1080p/24 output. If the OPPO doesn't shift into 1080p/24 then your display (or AVR) is telling the OPPO it won't accept that. Some displays that do handle 1080p/24 input properly are known to not publish that fact to the player during the HDMI handshake. If you think that might be the case with your display, switch the OPPO to 1080p/24 ON. For 1080p/24 content coming off the disc, this will make the OPPO use 1080p/24 output even if the display says it does not want that. (You'll still get 1080p/60 if the disc contents are not appropriate for 1080p/24 output.) If you lose video, you can recover by using the Resolution button on the OPPO remote to switch to 1080i (press Resolution, press Down Arrow, press Enter), and then go turn 1080p/24 back OFF again.
- Presuming you can get 1080p/24 into your display at all, now recheck the motion of those scrolling end-credits. If your display is "doing the right thing" with 1080p/24 input, then the vertical scroll of those credits should appear as smooth motion. Switch back to 1080p/24 OFF (i.e., 1080p/60 output from the OPPO) and you should see a fairly subtle stepping or ratcheting upward of those credits instead of a smooth motion. That's the "cadence judder" you are trying to eliminate. Get up close to the screen to check this.
- If the display accepts 1080p/24, but the credit scroll doesn't get smoother when fed 1080p/24, then your display is not doing the right thing with 1080p/24. It is accepting it, but converting it to 1080p/60 on input. There may be a setting you need to change in your display to correct this.
How do I turn on 24hz output?
See the manual (Setup Menu Options / Video Setup / 1080p24 Output).
Can I force 24hz output?
Yes, as described in the manual (Setup Menu Options / Video Setup / 1080p24 Output). As it says there, if you force 24hz output and your display does not really accept it, you will get no video.
Can I get 24hz output for DVDs?
Yes, as described in the manual (Setup Menu Options / Video Setup / DVD 24p Conversion). I haven't tested this myself, but I hear reports that the way DVDs are authored sometimes prevents reliable 24hz playback.
Since the transition between /60 output and /24 output requires a new HDMI connection setup "handshake" (meaning a couple seconds of distorted video while the new connection -- and its copy protection -- gets established) the player will tend to stay in "convert to /24" mode after it sees enough film-based repeat cadence to begin doing this at all. This keeps you from having constant re-handshakes in and out of /24 on a flakey disc.
But it also means that a flakey disc may very well turn on /24 and then stick with it even though it can't really be converted in a pleasing fashion because it is more flakey than not.
The workaround is to turn off the DVD /24 option while playing that disc. The player will then stay in /60 output throughout the playback of that disc.
And even though the disc is flakey, the OPPO will switch rapidly between film-based and video-based deinterlacing as necessary so things will look way better than you might be used to from playing such a disc on some other players. That's a transition that does not require a new HDMI handshake.
Why is the DVD 24p Conversion option grayed out?
As stated in the manual (Setup Menu Options / Video Setup / DVD 24p Conversion) and (Setup Menu Options / Using the Setup Menu System) Setup -> Video Setup -> DVD 24p Conversion is disabled unless Setup -> Video Setup -> 1080p24 Output is set to On or Auto.