The LE11 images in my share are updated with changes that restore hardware-decoding in ffmpeg, thanks to Raspberry Pi Foundation devs who are interested to see their v4l2_m2m patchest for RPi working on other devices - which is a bit of a detour from their day-job but will help them upstream RPi support at some point. Seeking in playing media does not currently work, but we are still exploring how that might be done. It won't be a quick thing to solve, but keep your fingers crossed.
One rather positive outcome of more-stable ffmpeg is 8-bit HEVC working nicely on GXBB/GXL/GXM devices, and on GXL/GXM this now allows 4K/HDR media playback to work (Yes, HDR!). GXBB also supports 4K HEVC, but as most 4K HEVC media is HDR (which GXBB lacks) and 4K H264 is not implemented in the current driver; so in practical terms GXBB remains a 1080p device.
On newer G12A/G12B/SM1 hardware support for 8-bit HEVC media should be okay, but 10-bit HEVC media (most/all 4K HDR media) crashes the hardware decoder and locks-up the board. It's something that needs to be poked - or perhaps we can disable the 10-bit path and force 8-bit ouptut to make things more usable until someone has time to investigate it properly.
All things considered, it's been a good week for progress 