mfvideoenc: Don't pass 0/1 framerate to MFT
Some MFT implementations do not accept 0/1 framerate and it will result in encoder open failure. If framerate is unknown, we will use arbitrary 25/1 framerate value.
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Some MFT implementations do not accept 0/1 framerate and it will result in encoder open failure. If framerate is unknown, we will use arbitrary 25/1 framerate value.