[Feature Request] Add support for BestSource

[Dan64]

Hello Selur,

  thanks for having added support to BestSource.
  
  In the case it could be useful.
  I attached a sample that fails to play properly with LSmashSource, with the script

clip = core.lsmas.LWLibavSource(source="sample_001.mp4", format="YUV420P8", stream_index=0, cache=0, fpsnum=25, prefer_hw=0)

  while using this script

clip=core.bs.VideoSource(source='sample_001.mp4', cachemode=0)

  it play perfectly with BestSource.

 
  Do you know if using the option cachemode=0  will affect in some way the output quality/speed of BestSource ?


Dan