start to use new ffmpeg library (#632)
* start to add ffmpeg library
* start to hook ffmpeg lib into main app
* improvements
* more progress
* make pipeline builder configurable
* more options
* move more logic down into ffmpeg lib
* ffmpeg lib desired state refactoring
* add software scaling and padding
* add loudness normalization and software deinterlace
* add metadata output options
* add setsar filter
* use built-in scaling logic
* fixes
* initial nvidia support
* nvidia improvements
* support hls mode
* print old arguments at debug level
* fix package reference
* start to add qsv support
* formatting
* fix tests
* add timeout to transcode tests
* show successful ffmpeg arguments
* add vaapi support
* add more software decoders
* add experimental transcoder option
* call existing ffmpeg process service for unimplemented features
* fix nvidia mpeg2video bug
* update changelog
* ignore some neglected unit tests
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