Fix a few minor issues in the extract_frames_from_video:

1. set orig_fps to 24 (the most common value) when the property is missing in the video
2. set the input fps param to 1 when it's missing or a non-positive value.
3. round up the elapsed_time when the value is like 0.9999999 so it includes the last frame.

Also remove the tests/data/video/test.mp4 file and generate it on the fly.

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