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JonesVid
Community Expert
JonesVidCommunity Expert
Community Expert
August 1, 2023

Some ProRes 422 Video Preview Files lost on closing and re-opening project

  • August 1, 2023
  • 71 replies
  • 6918 views

Kevin Monahan has suggested I post this for investigation by Engineering

I am getting a random loss of rendered video preview files on Premiere 23.5 well.

Hardware : PC Windows 11 (also does it on my back up Windows 10Pro Intel 9900K machine as well)

  • Intel 13900K
  • 64GB RAM
  • System C drive NVMe 2TB
  • Media Cache on Export NVMe Drive 2TB
  • Project Drive NVMe Drive 1TB
  • Media Drive SATA 2TB SSD
  • Nvidia 2070 Super GPU

I'm using Quicktime Hybrid method to create a video master in ProRes 422.

Editing Video on timeline mix of H264 and H265 4KUHD.

Majority of footage recently is H265 10bit.

All previews generated in ProRes 422 4K

Pro Res422 Preview files are big as they are used to speed up export considerably by Ticking Use Previews on Export (in General Tab)

Once you are working on the project and everything is fine in Timeline  you can see the rendered files on my NVMe SSD Project disc in Video Previews Folder.

No red bars on Timeline after render and project save.

Then shut down machine come back next day and Premiere is randomly losing them - not all.

This happens on my Intel 9900K machine as well.

This appears to be a database issue? (or other gremlin) which Premiere uses to locate the rendered files as the files are still there in Previews Folder and you can play them. Files are not lost.

To recover the previews you have to re-render yet again even no changes are made to the project/files.

I am meticulous about making sure before a major project I clear Media Cache etc which are located on a separate internal NVMe fast drive (not the System C drive) but I did try the C drive as a test which makes no difference.

The drive is correctly defined in Edit Preferences Media Cache.

Is there a bug in code somewhere that is not locating the Rendered files once done - so get lost on power down and power up.

When you are working with ProRes 422 files having consitent Preview files available that are pre-rendered is a must for Export to save time.

 

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    JonesVid
    Community Expert
    JonesVidCommunity ExpertAuthor
    Community Expert
    August 4, 2023

    Just to add a bit more on this after doing some search on threads in the Community Forum on similar topics

    It seems Premiere Pro also still uses some Media Cache files on the system disc Username\AppData\Roaming\Adobe\Common even though you have Media Cache location defined on an entirely different disc.

    So deleting Media Cache in Edit Preferences does not clear everything - loads of .ims  files remain in Media Cache Files on the System Disc which I understand to be describing the Properties of Files so Premiere does not have to scan each Media file on re-opening.

    None of my reading revealed anything about how Rendered Files are tracked. The only thing I came across was how some other  'none H264/H265' format files  had the same problem as ProRes Rendered files being lost (BRAW). That was quite a few versions of Premiere Pro back though and due to a plug in I believe.

    So I'm still none the wiser how these 'ProRes rendered files' are tracked by Premiere Pro and how it might be randomly losing them.

    So any help appreciated on this. I don't see anyone else reporting the issue (yet) which is a bit concerning.

     

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