Video Expert needed i.e ffmpeg/ffprobe

Hi I need the video export who can help me on the video related stuff. I have the mp4 videos with the h264 encoding, as you know that the h264 video can only be cut at the keyframe. So I want to get the keyframe info of the mp4 video file, the info should contains the following details 1- Keyframe chunk duration 2- Offset duration 3- Offset byte of the mp4 file of founded keyframes If you are expert in the ffmpeg and ffprobe then it will be the piece of cake for you as you only have to provide me the working command to get this info. Thanks!