I need to trim some videos with Avidemux, the problem is that the length between each keyframe is about 10 seconds, I want to shorten that to about 1 second.
Here is a screenshot if you don't understand: https://imgur.com/a/YV7nr9t
In the video below the length between each keyframe is about 2 seconds while the video above is over 10 seconds.
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Encode with shorter GOPs.
It depends on the encoder you're using. With x264 you enter keyint=xx in the Extra Options box -- where xx is the GOP size (distance between key frames). If your video is 24 fps and you want one second between key frames then you want to enter keyint=24.
A little more info: https://forum.videohelp.com/threads/391526-Handbrake-GOP-setting#post2537934