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donderday
Inspiring
November 21, 2017
Answered

Render glitch driving me nuts!

  • November 21, 2017
  • 3 replies
  • 15700 views

Hi,

I try to export a project from premiere pro. When in preview ( unrendered) the movie looks fine and smooth ( I have optical flow on and reduce speed with 5 to 10%)

When I render it to a h.264 all strange things happen, frames drop out, get darker etc.. But it happens randomly?!?! Now that drives me nuts... I now found a way after a long trail and error fase to get the videos out.. But when ( there are a lot of files) I want to render them in media encoder the frames drop again?!?!? Please Adobe tell me why, tell me why... Where is this strange inconsistency coming from? When the sequence is unrendered it looks nice and jolly but after rendering it drops out, AND while exporting as well.

I run premiere 11.1.2 ( I did a downgrade earlier cause it went ballistic on other fronts..)

and a mac pro ( late 2013)

mac OS sierra.

Correct answer donderday

I understand that it looks good in the timeline, but that doesn't help since your video needs to be rendered upon export. When you changed your sequence settings to ProRes and rendered the entire timeline did it look good?

If so, you can use those preview files without having to make new ones by clicking the "Match Sequence Settings" box at the top of the "Export Settings" dialog. Then if you set that up correctly you can click the "Use Previews" button at the bottom of the dialog.

Try this and see what happens. But first, change your sequence previews (the section at the bottom) to be ProRes. You might have to choose the "Desktop" preset from the dropdown menu at the top of the window in order to allow the change to ProRes.


For now I think it has something to do with the render engine I first set it to software only mode, but it did weird stuff on effects ( for example I had a blur on a layer and it the hole layer was positioned somewhere else.) But it rendered without the glitches.. I now set the render to GPU ACC metal modus and that seems to work with the effects and without the glitches.. But it takes some time.. Hopefully there is a way to work on openGL in the future without glitches...

3 replies

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donderdayAuthor
Inspiring
November 21, 2017

First frame is what it must look like second is..... the glitch.....   in a render it can be one or two frames. in the next render there ar much more...

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David Arbor
Inspiring
November 21, 2017

That looks like a very stylized color grade. I'd have to see more frames of different subjects/objects to see if the 'glitch' looked familiar.

Do you have any adjustment layers over your clips or any effects?

    brian704
    brian704
    Inspiring
    November 21, 2017

    Have you tried creating hiRez prevew files and setting your render to use those?

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    donderdayAuthor
    Inspiring
    November 21, 2017

    thanks for your response Brian. the thing is, if i play the sequence in premiere WITHOUT rendering it all look well and smooth and perfect. when I render there are some glitches appearing also in the sequence in premiere...  

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    David Arbor
    Inspiring
    November 21, 2017

    I wasn't suggesting that you export bits and pieces, it was simply a suggestion to export a small test so you can troubleshoot different things quickly, as opposed to exporting the entire video every time, only to see it fail. Have you tried importing this project into a new one? That can help sometimes.

    Do you have any adjustment layers covering all of your footage? Perhaps there's a bad effect.

      D
      David Arbor
      Inspiring
      November 21, 2017

      Instead of exporting directly to H.264, try exporting to ProRes 422, then using AME to convert to H.264. You can even set up a Watch Folder to do this automatically for you. Your ProRes file will also export faster than your H.264 file, although the total time of exporting ProRes and then converting to H.264 may or may not be faster than if you tried to directly export to H.264.

      Create a watch folder |

        D
        donderdayAuthor
        Inspiring
        November 21, 2017

        you will not believe it... but the ProRes have glitches too ....

        D
        David Arbor
        Inspiring
        November 21, 2017

        Are the glitches the same every time and on the same frames? If so, I would set an in/out point and only export a small section to save yourself time while troubleshooting.

        Have you tried clearing your Media Cache before exporting? That often fixes a lot of problems.

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