[fg118942]

Originally Posted by HolyWu

https://github.com/HolyWu/L-SMASH-Wo...ks_20191115.7z

• Update to FFmpeg-20191114-73ee53f.
• VapourSynth: Export mastering display metadata and content light level in frame properties.
• VideoSource: Improve capability check in prefer_hw.
• LWLibav: Fix VP9 decoding issue with superframes.
• VideoSource: Enable AV1 decoding via libdav1d.
• Add parameter ff_loglevel.
• LWLibav: Adjust the structure of index file to reduce file size.

HolyWu, thank you so much for fixing the issue of VP9.
However, using LSMASHVideoSource in version 20191115 will cause Access Violation.