Video Problem?

[Joe Marler]

[Jim Hart] “all browsers, firebox included, play fine on my 15 inch MacBook Pro and my MacBook Air.”

Could you please re-state what machines you’ve tested this on — the year, model and config if each machine, also what version of MacOS on each machine?

I mostly focused on desktop machines but my top-spec 2019 MacBook Pro 16 showed the problem, maybe to a lesser degree, or maybe harder to see due to the smaller screen. I will re-examine that.

It currently appears to not happen on Windows using the main browsers and only on Mac on FireFox and to a lesser degree Chrome. The fastest (though distasteful) workaround is add a note to the video description advising Mac users to play the video on Safari for the best experience.

As already discussed a partial workaround is export the video using Compressor using a 120 keyframe interval. That doesn’t totally fix it on FireFox but it lessens it.

I will try to examine this further, as it has broad implications for any producer of high quality streaming content.

[Jim Hart]

[Joe Marler] “Could you please re-state what machines you’ve tested this on — the year, model and config if each machine, also what version of MacOS on each machine?”

Tested on various PC’s at work with all browsers…heck, I even threw it at Brave and Opera without issue.

Macs that run fine on all (at least to my eyes) were a 15″ MacBook Pro (late 2015 model) running Catalina 10.15.5, a 13″ MacBook Air (2013 model) running Catalina 10.15.5, and all iOS devices in my house…iPhone 11 Pro Max running iOS 14 Beta, iPhone XR and an iPhone 7 running iOS 13.

My jittery issues seem to be on my home and work Macs: a 27″ iMac (2017 model) running Catalina 10.15.5, two 27″ iMacs (2015 models) running Catalina 10.15.5, and a 27″ iMac Pro (2020 model) running Catalina 10.15.5. The iMac Pro is a beast with a 10 Core processor, 128GB of ram, 2TB SSD, and a Radeon Pro Vega 64 16GB video card.

[Jim Hart]

Just FYI, last night I imported the ProRes file into Adobe Premiere Pro, and then exported out as an mp4, CBR of 100, key frame distance of 120, and H.264. Same issue.