Changelog:

• y4m: Support files with longer sequence header.
• y4m: Support ffmpeg's color range extension.
• Fix parsing of enums.
• Support writing the mastering display color volume SEI message.
• Support writing the content light level information SEI message.

1. Rebuilt packages:
   • avidemux
   • ffmpeg
   • gst-plugins-ugly
   • gstreamer-1.0-plugins-ugly
   • handbrake
   • obs-studio
   • vlc
2. Transcoded MPEG2 video to H264 using FFmpeg. Played resulting video with mpv.