Originally Posted by nutsandbolts
I think 24fps, the native film frame rate is perfect on Kuro. 23.976 is the frame rate a 24fps source would be played on an ordinary NTSC TV. Kuro, as we agreed earlier, can do 24fps perfectly, better than most HDTV sets out there.
The problem is most of the content
has been adapted to 23.976fps, from its natively filmed 24fps. Blu-ray spec provides for both 24 and 23.976, but most of it is 23.976. Consequently, if the Pio only does 24Hz, the player (whether it's a set top player or MPlayer or whatever) must
manipulate the content in some way to maintain A/V sync.
So are you saying you tried 23.976fps with Kuro (without the 24Hz video card in between) and it did not work? I suspect Kuro would be subjected to 23.976 source with some DVRs and set tops out there. So it should work, but I am not certain of that.
The video card itself (NVidia 8600GT) is known to support 23.976Hz. I tried all kinds of mode lines to make the Kuro sync at 23.976, but to no avail. After failing, I RTFM'd and then noticed the Pioneer's manual did not specifically say it supported 23.976Hz and 59.94Hz at 1080p (and the manual's mention of 59.94Hz at 1080i suggests it doesn't support these modes at 1080p).
Unfortunately I have no set top Blu-ray player with which to test. Even if I did, I'm not sure how much I'd be able to determine, because the Pio doesn't show what refresh it's synced up at. So if the set top output was flawless, I would not know why: it could be because in fact the Pio does
do 23.976Hz, or it could be because the set top player resamples AC3/DTS audio. It's not clear to me how I would be able to distinguish between these possibilities with a set top player.
What kind of results do you get if you play the same content on a computer monitor with your Linux box? Does it have proper cadence? I think it will not.
I haven't tried, because the cadence would clearly be wrong as you suggest. The LCD monitors I own sync at 60Hz, so the experiment wouldn't provide evidence for anything.
Also, did you experiment with -ofps , -speed and framestep options of mplayer?
-ofps is an mencoder option and framestep isn't the solution. -speed 1.001 would work wonderfully, for sure, if only mplayer supported resampling with its hwac3 audio driver (for AC3/DTS passthrough). Unfortunately it doesn't.
And so we've come full circle to original question: does the Pio do 23.976Hz and how do we tell (as opposed to guessing)?