OK, I've figured out a lot of the problems I've been having with the R7 (and still love it, by the way) but this one has me puzzled.
I shoot video. I download the file. I then play it.
When I play it in the Windows 10 software (whichever one that is that automatically pops up) it plays just fine. (And yes, I'll have to upgrade toW11 sometime soon.)
When I open it in DPP4, the playback is jumpy. It jumps ahead a bunch of frames, shows a frame or two, then jumps again.
Oh, and when being played back in-camera, it plays smoothly.
I need it to behave because I use DPP4 to select a frame out of the video feed to use as a still.
I had recently experimented with doing video in Manual, and selecting shutter speeds, etc. But the latest time I simply did the default Program selection for video.
How old is your computer? It may be your CPU or memory are outdated. It's fine for playback on the OS, but I believe DPP4 uses highly compressed video codecs like H.265, and needs more processing power to run it. Just one possibility.
Jim
It sounds like it's trying to decode in software rather than hardware. Are they any checkboxes in the options that say something like "use hardware acceleration" that might have gotten unchecked?
If all else fails, play back the video at full resolution on a 4k monitor in Quicktime (or whatever player you use) and take a screenshot of the frame you want. This technique works surprisingly well for YouTube thumbnails and social media posts. You can even run the frame through Topaz Photo to clean up noise, sharpen, etc.