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I quick method do browse iframes is to open the video in Aegisub. It allows you to seek to next/previous keyframe in the video by pressing shift+left / shift+right (the framenumber field in the GUI has a turquoise color when you are on a keyframe btw).
Count of iframes is given in stats of tools like Avinaptic, but that sadly won't give you the number of a specific keyframe. I think mkvinfo (part of mkvtoolnix) also gives a breakdown of keyframes with timestamps.
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