Checked in to GIT updates to tiff (4.7.2) and dav1d (1.3.4) libraries.  And a fix was provided to bluray creation where the BDMV tree is now correct/complete.  At some time when FFmpeg was upgraded to a new version the structure was incomplete and there was an error that was only seen at a high loglevel. In ffmpeg/format/bluray sdt_period=-1 was a value that is now out of range so fix is to use sdt_period=1000000. The option was changed from a plain int where -1 meant "off" to a duration instead. I always test bluray creation when installing a new FFmpeg version by creating bluray disc media and viewing on 2 different bluray devices connected to the TV.  Both worked which just means the bluray players are fairly tolerant of whatever is thrown at them and at least these 2 did not seem to care that the BDMV tree structure was not right.

P.S. Tested update to libjpeg-turbo to the latest 3.2.0 version but unfortunately, it has a cmake version requirement of 3.15 and Ubuntu 16 is at 3.5.1 so no go.  Ditto on libaom to 3.14.1 which requires cmake of 3.16.