We've had a look. The unusual feature of the file is the SPS/PPS headers initially report the aspect ratio, then at ~2mins stop reporting it. While that is not illegal, it is strange and it triggers a bug in the firmware processing (it repeatedly reports "aspect ratio has changed", but as there is no aspect ratio to update to, that condition never stops).
I've had a go at fixing firmware. The guy show needs to sign off on this is on holiday, but you could test it from here.
Extract start4x.elf and fixup4x.dat and replace the files start.elf and fixup.dat on the first partition of your sdcard.
(Keep a copy of the original versions just in case).