What is causing the random glitches in my Optimized/Original Timeline footage?

Can you upload the original, unrecompressed file somewhere like WeTransfer or Dropbox?

The workaround for the HEVC media that others are doing is to convert the files to either ProRes or H.264 using EditReady or Compressor. This always gives an opportunity ton convert the audio to uncompressed 48K rather than using the original AAC 44.1, which is always problematic in the production chain. Also using an app like Filmic Pro or Mavis gives you better control of the media.

Hi Tom,

I just want to share that after delete generated file and run "optimize" video then export.

It does solve the issue. we tested on 2 of our mac.

Big thanks to you to unblock us for our works.

The codec we're trying to export is H264 and resolution is 1080p.

We do observe that the clips with glitch image seems to come from iphone11,

and we have clips from Sony(AVC Coding, Linear PCM) and iphone11(AAC, HEVC)

Just a wild guess, maybe the bug is caused by rendering from AAC.

Still, it considered a big bug for us, anyone know how can we report this to apple and so we can let them know they should fix this ASAP consider so many people having the same issue?

I noticed that if you apply exposure change to the clip that have the glitches it will disappear, I mean just put the timeline exactly where the glitch is and change the highlights or shadows one percent and it will fix it, it will come back in other places very soon so what I'm doing is finish everything with my project then before export I put an adjustment layer above the whole project and slightly change anything in the color wheel then I export immediately without even scrubbing my mouse on the timeline .

my graphics processor is AMD Radeon R9 M290X 2 GB

BTW is everyone of you guys has the same graphics processor ( Radeon ) ?

I think maybe it's driver bug?

I do not think it is caption related. I have many examples in videos without captions. I have more examples not near a transition than near a transition. I still think it is bug in the Metal driver use. It looks to me like references to old buffers.

My only work around has been to unfortunately export the initial timeline from Final Cut to DeVinici and render the video in DeVinci before sending to Compressor.

No captions here, it really starts to glitch up on the timeline when I start scrubbing video. After a render it will come back and look fine. I also have found that to fix it from glitching I need to move the video, or cover with some broll.

What camera and what are the media settings?

This seems to happen with specific codecs from Panasonic cameras.

A possible workaround is to convert to ProRes outside FCP X.

Importing the clips is kind of necessary to edit.

It's not the act of importing that damages the files it's just doing anything with the original HEVC can damage them. If you're just doing simple cuts then your method is fine. For anything more complex, and if you want to really edit in FCP you need to have reliable media that works well. Processing the files before you bring them into FCP lets you do that.

I did not talk to Apple Support, can we actually call them about something so complex? I submitted bug reports.

There is a new version 10.4.8 which appears to resolve many issues. I also updated to MacOS 10.15.2. You have to delete generated files "File->Delete Generated Event Files" on any existing Library Events. I still see some minor playback glitches but do not know if they extend to exported files. May be solved, I have yet to confirm in detail.

Could you please open that clip in the QuickTime Player and post a screenshot of inspector window, or perhaps upload the file to somewhere it can be accessed like Dropbox or WeTransfer?

I have the clip uploaded to Vimeo, all the clips from that particular shoot. It was raw footage for a recruiting site. You won't see a glitch, unless it is constant in the timeline..It comes and goes. I get around it by rerendering and sliding footage around, however sometimes it takes multiple uploads to get it glitch free.

https://vimeo.com/373942124

Heres an uploaded file with glitch at 1:29 https://vimeo.com/373942124

No, no, no. Not exporting. The damage has already been done. The files need to be processed before bringing them into FCP. Bring them onto your system using Image Capture. Batch process them and then import the new files. You can dump the originals if you want, the processed files will be your new original media.