chore: add disclaimer

Avoid creating a nullptr slice

Add CI

fix(util/channel_layout): strip trailing nul in `describe` results on 6.1

refactor(examples/codec-info): deduplicate codec printing

Merge pull request #181 from projectgus/feature/display_rotation

Merge pull request #169 from tilpner/get-delay-base

Merge pull request #180 from encounter/format-output-no-file

stream: Allow to get/set display rotation.

fix(format): skip `avio_open` when format has `AVFMT_NOFILE`

feat(context/sink): add `time_base` getter

fix: use explicit types for lifetime transmutation

Merge pull request #175 from tilpner/timebase-optionality

fix(examples): adjust for time_base changes

feat(codec/packet, util/frame): expose `time_base` fields