有时可能需要将视频从高分辨率转换为低分辨率，这个过程叫downsampling。
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References:
https://en.wikipedia.org/wiki/Image_scaling
https://en.wikipedia.org/wiki/Nyquist%E2%80%93Shannon_sampling_theorem
https://courses.cs.washington.edu/courses/cse576/16sp/Slides/3_Sampling.pdf
https://pdfs.semanticscholar.org/presentation/0796/7a772188badefe38cbb38a04dbba25c8dfa7.pdf
http://eeweb.poly.edu/~yao/EL5123/lecture8_sampling.pdf
https://www.cs.princeton.edu/courses/archive/fall00/cs426/lectures/sampling/sampling.pdf
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