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Export stuck at 0% - Can I Export without transcoding?

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David Townsend
Export stuck at 0% - Can I Export without transcoding?
on Sep 24, 2019 at 11:33:48 pm

I have a 3 1/2 minute video, trying to export a master file 1920 x1080, H.264, file size 479.6MB. Background task export is stuck at 0% in the Transcoding step and no signs that it's doing anything. I've Deleted Render Files, turned off Background Rendering, and I even rendered what few transition clips there are before export.

I'm working off & exporting to a Lacie external, read/write permissions set for "everyone". I've been able to create and edit projects without issue. I even tried to export to the local HD with same result.

I need to send off a "rough cut" .mov file of this to my client tonight...

Anyone know what's going on? Is there a way to skip the Transcoding step?

Machine specs (fully updated):
MacBook Pro (15-inch, 2018)
2.6 GHz Intel Core i7
32 GB 2400 MHz DDR4
Radeon Pro 560X 4 GB
Intel UHD Graphics 630 1536 MB

FCPX 10.4.6 (fully updated)


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Joe Marler
Re: Export stuck at 0% - Can I Export without transcoding?
on Sep 25, 2019 at 12:14:13 am
Last Edited By Joe Marler on Sep 25, 2019 at 12:20:55 am

Not sure what the problem is. Can you verify plenty of free space on both system and Lacie drives?

Run Disk Utility First Aid on system and Lacie drives. To properly run it on the system drive requires booting in recovery mode: https://support.apple.com/guide/disk-utility/repair-a-disk-dskutl1040/mac

After that rebuild Spotlight indexes. FCPX uses this for expedited search. If damaged or corrupt it can cause problems: https://support.apple.com/en-us/HT201716

Make sure you have the latest version of Apple Pro Video Formats installed. Starting with Mojave that is in System Preferences>Software Update.

Reset FCPX preferences (step 11): https://support.apple.com/en-us/HT203477

After doing that make sure background rendering is off in FCPX>Preferences and all other prefs are as you expect.

Even though you have deleted the render files, try setting a specific location for cache. Select the library, then in the library inspector do Storage Locations>Modify Settings and under cache give a folder location. If it asks about including render files, state "don't include". This ensures all render files are rebuilt, including thumbnails and waveforms.

Then load project in FCPX, select all timeline clips with CMD+A and render the timeline with CTRL+R. Observe all render dots are gone. If you have any clips using optical flow or stabilization, make sure the analysis phase of those are complete before rendering the timeline. This helps isolate the problem between render phase vs encode phase.

If that completes with no errors try to export it: File>Share>Master File
Settings>Format>Computer
Video Codec: H.264 Faster Encode
Resolution: 1920x1080

Make sure the destination file is on a valid drive with sufficient free space and permissions. If any doubt export to /Documents or insert a thumb drive and export to that.

If that gets stuck or doesn't work, make a snapshot of the timeline: select the project icon, right-click and pick duplicate as snapshot. Then open the snapshot, select all clips in timeline with CMD+A, then strip all effects with Edit>Remove Effects. Select all clips in timeline with CMD+A, then try to render with CTRL+R. If that is OK, then try to export (without effects - just a test).

If that works but the other steps failed, duplicate the timeline again, select 1/2 the clips and remove effects from those, try render then export. Based on these results try the other 1/2, then 1/4, then 1/8 and find where the problem region is.


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David Townsend
Re: Export stuck at 0% - Can I Export without transcoding?
on Sep 25, 2019 at 12:22:06 am

Joe thanks a ton for this troubleshoot list! I'll get on it...

As a temporary shortcut to hopefully show my client something asap, is there a way to bypass the transcoding background task and still get a good movie file output? I ask that realizing any background task may get hung up if there's a wonky clip or something in there. but thought id' ask...


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David Townsend
Re: Export stuck at 0% - Can I Export without transcoding?
on Sep 25, 2019 at 1:05:17 am

ok so apparently all that needed doing was switch my export options. I was exporting as:

Format>Video and Audio
Video codec>H.264
Res> 1920x1080

...switched to the settings from Joe's post and the export cranked out in under a minute. Thanks again!


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Joe Marler
Re: Export stuck at 0% - Can I Export without transcoding?
on Sep 25, 2019 at 11:26:24 am

Your export should have worked, don't know why it got stuck. The H264 encoding is slightly different for that option - it uses a smaller GOP length but this should not cause a "stuck" export.


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