The following are updated Test Patterns to help discern any video judder issues in mismatches between frame rates and refresh rate.Test Files
These Frame Rate Test files are a high bit rate 1920 x 1080 MPEG2 (with a blank AC3 sound track so it works with Reclock) in a M2T container taking up about 1GB each (but all three are in the 45MB Zip File) and include files encoded to refresh rates used in:
* Blu-ray (24 unique frames encoded at 23.976fps)
* PAL (25fps)
* NTSC (30 unique frames encoded at 29.97fps)How To Use
: Each file has a set of unique images that repeat every second for five minutes so you have plenty of time to observer how smooth the video is rendered. Change your monitor refresh rate to match that of the file you are going to play, then play it and keep your Eye on how smoothly the Red Dot moves across the screen. It should be nice and smooth but you may see issues such as pauses (repeating frames) or jumping forward a bit (dropping frames).
For "fun" or for those that don't think telecline judder as used by NTSC transfers looks bad, just play the 23.976 file back on your monitor/TV set at 60hz!
EDIT: I've noticed that these test files also highlight more than just the fluidity of video playback:Pulldown / Frame Interpolation
: One thing I've noticed that is interesting with the test files, it shows you what pull down and frame interpolation is being applied by the PC and/or TV. Each of the test files is only encoded with only 1 red square per frame. So when playing say the NTSC test file (29.97) you see two red squares when played at 60hz...in this case (I guess) the video renderer or TV displays each frame twice but overlaps them with the following frame. Now the interesting thing is when I play the Blu-ray test file (23.976) at 24hz I see 3 red boxs on my setup. As this is not being done in the PC, it looks like it must be the TV doing a 3:3 frame interpolation (though the documentation on the PIO LX608 is pretty vague on it's settings and options here).Pixel Refresh
: I also notice a very faint red trail (an erratic scattering of pixels) trailing the red box for a couple of mm at most
For these that are interested and if there are any odd visual artifacts, these test files were made form individual PNG slides, authored in Vegas and rendered using the MainConcept encoder.