[Jim Hart]

I tested same vide three different ways.

No effects, no transitions, nothing on the videos in the timeline.

Video is 4K 60 FPS (4096×2160)

1st Video:
Project timeline in FCPX is 4k 60FPS 4096×2160 Apple ProRes 422
Export –
Mastering (Video/Audio)
Codec (H.264)
Audio (ACC)
Data rate (133Mb)

2nd Video:
Project timeline in FCPX is 4k 60FPS 4096×2160 Apple ProRes 422
Export –
Mastering (Web Hosting)
Codec (H.264 Better Quality)
Audio (Acc)
Data rate (20.18Mb)

3rd Video:
Project timeline in FCPX is 4k 60FPS 4096×2160 Apple ProRes 422
Export –
Mastering (Video/Audio)
Codec (ProRes422)
Audio (ACC)
Data rate (1.22Gb)

For all three videos above, On Mac, Safari in 4K or any lower is smooth as butter in normal window and full screen. In Chrome or Firefox, still jittery.

For all three videos above. On a PC, Internet Explorer, Edge, Chrome, and Firefox are all smooth as butter.

I just don’t understand.

[Jim Hart]

Video plays just fine on Windows PC at work. Strangest thing. I am going to look over all of my settings and use suggestions fro you all and get back to you…things have been hectic. Talk soon.

[Jim Hart]

Progressive

[Jim Hart]

I believe the data rate was 1.09GB. The file was a .mov straight out of FCPX.