Log Message:
ffmpegthumbnailer: update to 2.2.0.

FFmpegThumbnailer 2.2.0
- New option to prefer embedded image metadata over video content (command line \ 
argument: -m)
- Fixed 'Resource temporarily unavailable' errors when using ffmpeg < 3.0

FFmpegThumbnailer 2.1.2
- Restored deinterlace functionality using the libavfilter library (additional \ 
ffmpeg dependency)
- Additional video mime types added to the thumbnailer file
- Take rotation metadata into account when generating thumbnails

FFmpegThumbnailer 2.1.1
- Buildable agains latest ffmpeg (currently breaks deinterlacing)
- Fallback when smart frame detection fails (thanks to johnnydeez)
- Add MPEG-TS (MTS) support (thanks to marcinn)

FFmpegThumbnailer 2.1.0
- The library is now completely silent on std out and err by default
- A callback can be registered to listen to logging messages
- Fixed cmake installation directories (thanks to Vallimar)
- Fixed dimension calculation for anamorphic streams (Thanks to Richard Zurad)
- Fixed static library filename

FFmpegThumbnailer 2.0.10
- Migrated to github
- Use cmake instead of autotools
- Remove stderr logging

FFmpegThumbnailer 2.0.9
- Fixed gio library loading issue
- Support udp sources (thanks to tchristensen)
- No longer support older ffmpeg versions