Hmm,..probably different error from what i’m experiencing in the past (different container, from different camera manufacturer, forgot about the types though, happen 1+ year ago.)
Other than your Radeon; spec wise, actually you shouldn’t have a problem exporting your project at all.
CMIIW, but radeon isn’t natively supported in Adobe.
I really didn;t have a clue with Radeon, i never use it.
So, have you tried to render with “Mercury Playback Engine Software Only” ?
Did you use the most recent version of AME and PPro CC ?
I remember reading a update release notes regarding AME (?) throwing an unknown error (?)
But darn it, i can’t find the link (but probably some old release notes / CS 6 etc).
Many things can cause the export to crash in CC 2014 prior recent updates.
Make sure you do that first,and restart.
When it crash, did you notice a pattern ? Did the failed exported video is always failed in certain time mark ? A corrupted source video might be the culprit if this was the case.
If you want to convert your clip, just batch encode them in AME with the same setting for all camera with the same filename.
Batch rename the current video with suffix “Old” (or anything you prefer).
EG: MVI_001_old.mov
This way, when you open your project, premiere will “missing” that old file. All you have to do is re-link the new encoded video. This is why it’s important the new encoded video has the same name like in the original file.
And make absolutely sure you have a exact setting (frame rate, size, etc) in your newly transcoded file like the original.
But make that workflow as your last option. Since it could be the error is nothing to do with your source video.
As a test, did you use any 3rd party plugin ?
Test a barebone render (no fx,grading, titling whatsoever, either in video or audio), no transition other than built in Premiere.
You can remove all fx easily by blocking all the clip and select “remove effect” (Clip|Remove Effects)
See if you can success rendering your project out.
I’m sure you already know this, but i’m saying this for the sake of clarity since you say you fairly new to Premiere: Do that with duplicate project, there’s no need to breaking down your original project file.
Regarding your question about the render setting (your workaround, rendering with splitted project, joined them afterwards).
I don’t think rendering to ProRes LT is a good path, the quality will suffer IMO, especially you want to do multipass.
At the very least, you want to export as ProRes HQ, or even better to a lossless codec.
With lossless codec, you will not lose quality whatsoever, as if you were rendering directly without splitting.
Bear in mind lossless will produce a bigger file than the compressed ProRes.
There’s no need to export to uncompressed if a lossless codec is available.
(much smaller size compare to uncompressed).
TLDR:
1. Clean your media database/cache in the preferences.
2. Try rendering in “Mercury Playback Engine Software Only”
3. Do a barebone render test, see if some third party plugin causing it. Or in some case, even built in Premiere fx can be the culprit (prior to updates). You might discovered a new bug.
4. If all fails, split the project, because you said it works , but render as lossless instead.
5. Convert all source video into single setting, bear in mind, you actually lowering your source video quality, unless you re-encoded them with either lossless or uncompressed.
Notes: Option 4 is much better than option 5.
Option 5 is last option if all fails, and in all my work i actually only do that one single time due rare crash with weird mix container from different types camera.
Edit:
TLDR Typo
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Sorry for the english, not native speaker.