fftools/ffprobe: Avoid overflow when calculating DAR
Both the codecpar's width and height, and the SAR num and den are
ints, which can overflow. Cast to int64_t, which is what av_reduce
takes.
Without this, occasionally, display_aspect_ratio can be negative in
ffprobe's -show_stream output.
Signed-off-by:
Derek Buitenhuis <derek.buitenhuis@gmail.com>
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