IOS Dev Intro - AVASSetWriterInput Scale Encode
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ios video capture size 1280x720, AVASSetWriterInput
outputseting can set to 640x360. The video will
be encoded to 640x360.
If the encoded video is decoded by VideoToolBox, its
last decoded size will be adjusted to 1024x576 instead
of 640x360 in decoder internal. Similarly, for 640x480,
it will be adjusted to 1024x768 instead of origin 640x480
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