introduce MLT_DEFAULT_PRODUCER_LENGTH env var to override default hardcoded value
Document new MLT_DEFAULT_PRODUCER_LENGTH environment variable.
set metadata 'timecode' from first frame's meta.attr.timecode.markup property
Fix a couple of compiler warnings in avformat unrelated to API.
Merge branch 'master' of git://github.com/j-b-m/mlt
Fix audio encoding with libav. (Debian-761593)
Fix regression in previous commit for libavcodec < v55.
Fix encoding on FFmpeg libavformat v56.
Remove ineffective statement (video_pts ovewritten).
Fix deprecation using AVStream.codec.time_base as muxer hint.