Trying to export a UHD @ 25fps H.264 fails.
i7-2600K (not overclocked, Hyper Threading disabled)
GeForce GTX 660 (Driver 347.52)
Windows 8.1 Pro
How to reproduce:
New Project: 4K Ultra HD @ PAL 25 fps
Import a file containing UHD @ 25fps
Take 5 seconds of it (length may not be important) and place in editor
Shrink the editor duration down to 5 seconds to match the length of the clip.
Save the project (may not be important)
-Target Bitrate: 102.127
-Max Bitrate: 150.096
Export - After a few seconds: Export Error - Failed to push frame 42.
Changing the Target & Max Bitrate seems to have the same effect just happens on a different frame, but it's always the same frame for the given Target/Max settings.
Changing to Constant Bitrate exports fine.