On my C2, as soon as I use Leia-builds, I cannot play H264 files (MPEG-4 AVC (part 10)) with hardware acceleration activated. The video starts, but within a couple of seconds it stops; in addition, the timestamp is nonsense (i.e. -455485:28:30) All Krypton-builds work fine.
Here are some sample videos: https://c.gmx.net/@329626646187350530/T ... 1OKaH9RmDg
Some more details can be found here: H264 playback issue with hardware acceleration activated - ODROID