Allow ffmpeg to copy the stream if the requested dimensions are similar enough #6
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These changes allow homebridge-dafang to copy the stream instead of re-encoding it when the requested dimensions are similar to the stream coming from the camera. It detects the width and height from the stream automatically using ffprobe. I also refactored the ffmpeg option handling to support it more easily, now allowing global_options and input_options. Note that this doesn't take into account bitrate and fps. Also note the (image) source no longer is expected to contain the "-i ".