Gass jdww it seems that boot procedure is stalled if there is no working network connection in current nightly image. If board has ethernet connector, I suggest to connect it for now until issue is solved. If there is only wifi, there is possibility to manually add config for it over console but I'm not sure how to do that.
EDIT: Fix was just merged, next nightly image should boot normally. Actually this fix solves several issues.
Yes, I tested several videos H264 HD, SD XviD, AVC. (XviD videos are also jerky).
AVC is just another name for H264. XviD is not HW decoded (see OP).
First I have to say that LibreELEC-A20.arm-9.80-nightly-20200426-65f515b-bananapi (oldest I have) works quite well.
This is extremely old build and many packages were updated from that time. I guess some kernel change is at fault but I have no clue which one.