Fix Array Out of Bounds crash if no video tracks present

Youtube like video track selection

This also fixes a bug that compared track type & renderer index

Update to OkHTTP 3.12.1 and ExoPlayer 2.9.3

[WIP] Fix android subtitle issue caused by using rawdatasource

Added filterEnabled flag and don't enable filter if source is an hls playlist

Edit fancy braces

Fix iOS video not displaying after switching source

Defect fix

solve the memory leak on Android and avoid the crash on kitkat