VLC 3.0.8 nightly build 20190816で大幅修正
Changes between 3.0.7.1 and 3.0.8:　https://www.videolan.org/developers/vlc-branch/NEWS

Core:
　* Fix stuttering for low framerate videos
Demux:
　* Fix channel ordering in some MP4 files
　* Fix glitches in TS over HLS
　* Add real probing of HLS streams
　* Fix HLS MIME type fallback
Decoder:
　* Fix WebVTT subtitles rendering
Stream filter:
　* Improve network buffering
Misc:
　* Update Youtube script
Audio Output:
　* macOS/iOS: Fix stuttering or blank audio when starting or seeking when using external audio devices (bluetooth for example)
　* macOS: Fix AV synchronization when using external audio devicesVideo Output:
　* Direct3D11: Fix hardware acceleration for some AMD drivers
Stream output:
　* Fix transcoding when the decoder does not set the chroma