Convert your video into an Image Sequence (e.g., JPEG or PNG).
By default, Maya often only supports .avi (Windows) or .mov (Mac) for playblasts. How to Get an MP4: Maya.mp4
If you need to import an MP4 into Maya to use as a background for tracing movements: Convert your video into an Image Sequence (e
In Maya, create an and check the box for Use Image Sequence . JPEG or PNG). By default