Revert "Fixes for slow channel switching"

This reverts commit 4bdf10f354d2572788662b0cebb3c42cb8dae9e9.

unfortunately. this does more harm than good.

with some pvr clients (pvr.iptvsimple, probably tvheadend + tvh recoedings too)
vdpau h264 decoding fails due to missing width/height information

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19:59:55 T:139876741670656 WARNING: (VDPAU) no width/height available, can't init
19:59:55 T:139876741670656  NOTICE: CDVDVideoCodecFFmpeg::Open() Failed to get VDPAU device
19:59:55 T:139876741670656  NOTICE:  (VDPAU) Close
===