fix episode smartplaylists (fixes #14267)
smartplaylists: disable grouping for episodes
Merge pull request #2606 from Montellese/xsp_episode_fixes

Two fixes for episode smartplaylists
Check dir cache after SubstitutePath.
Make sure dir ends with slash when check cache.
Merge pull request #2608 from ulion/check_dir_exists_use_dircache_fix

Fix problems introduced by PR2496 (check dir exists use dircache)
vaapi: fix argument for ff_vaapi_common_end_frame call
Add backported vaapi fix to ffmpeg/patches
Merge pull request #2599 from BtbN/ffmpeg_vaapi_partialfix

Partial fix for ffmpeg VAAPI