更新情况：
[update] MediaCoder build 4430
  [add] CUDA accelerated H.264 encoder
  [add] CUDA accelerated frame scale filter
  [add] video buffer memory utilization control option
  [fix] aspect ratio issue
  [fix] misc bugfixes
[add] CUDA H.264 encoder
[add] CUDA video filter (only down-scaling implemented at the moment)
[update] x264 r1163
[update] MediaInfo 0.7.16

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