Originally Posted by chrisdack
Hi. I've been reading your tests with interest because, like you, when watching streamed media I could swear I see judder not just frame to frame but back and forth. 2 steps forward, 1 step back.
I recorded the worst panning test scene from Sneaky Pete at lowly 60fps and playing back at /10 speed you can see the vertical edges on every other frame is not equal to the previous or next frame.
I will try your DJ1 settings.
Quick question, when you've been testing 24p and 24p over 60 have you been using the film native 23.976 and 59.940 or the whole numbers which actually is quite rare to get in real content.
I'm on the latest UK firmware which is actually after the Korean firmware but there's some disagreement whether it includes the motion fix.
Some people including myself do see this back and forth frame pulling until you add DJ to settle it down and take the edge of the choppiness in the video. I will make more videos and post it here in this forum. I'm sure as collective mind we get to the bottom of it.
Latest firmware doesn't have fix for the motion artifacts. It is only improvement to DJ and DB in my opinion from what I tested. DJ 1 will introduce artifacts on the specific test patterns. When watching movies it does not appear to be a problem when used at lower settings. The result with DJ 4 and DB 10 is very pleasing with the new firmware.
Recording of the OLED screen is a bit difficult. We would need commercial high speed cameras. Typical consumer equipment does not have functionality for slow motion. Home video cameras store videos in compressed format most likely mp4 (h264). You only get few key frames per second in this file. If you don't play it at full speed you end up with key frames only, one at the time. Slowing down mp4 video just a bit gets very choppy. Try it.
Second issue at least on my camera is that it is from 2008 and the HD is 1080i. It records and plays back half interlaced frame at 60fps. When I pause it shows 2 key frames together to make one image. These frames were far apart as key frames.
We get deeper into to it when I get the time to make new videos of the OLED screen in action
24 or 23.976. After downloading the the test file from RTINGS I had a closer look at the codec data. The file is 24fps even.
Using Raspberry Pi I can select different screen refresh rates similar to computer. LG E6 has full set of video resolutions and refresh rates available including 23.976, 24, 25, 30, 59.9, 60 from what I remember. The test was on 24Hz automatic and manually set. No difference. 60Hz was manually set.
From what I see using quarter speed slow motion from my camera the frames are not shaking. The only way you get this back and forth movement would be if the white object moving forward brightens up more at initial charge and dims back down in a fraction of a second. The frame behind area going black would need to go black and flash back some residue of static voltage. Or it's our brain reacting to pulsing movement and some image retention in the eye as the frames are flashing one at the time.