Merge branch 'openh264' into 'master'

Fix openh264 and ffmpeg recipes

See merge request bob/bob.conda!335
2 jobs for master in 10 minutes and 37 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #122171
docker
build-linux-64

00:10:37

passed #122172
conda-macosx
build-osx-64

00:10:00