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Fiddling with the h264 and h265 params I found both keyint and min-keyint settings.
Setting keyint shouldn't force the codec library to use exactly that frame interval?
Do min-keyint have something to do with scene detection and if set it take priority over keyint plain setting ?
TL;DR: I found that h265 default settings are keyint=250 and min-keyint=25 ... what I should expect from that? A fixed length GOP or a variable length one?
See these two links:
1) MeGUI/x264 Settings for an explanation of the parameters like keyint.
2) About --keyint --min-keyint and --scenecut for a discussion at Doom9 about how they interact, specifically
--keyint is the maximum interval. x264 will insert key frames earlier if it deems them beneficial, e.g. due to a scene change. From my experience the majority of key frames are in place because of the properties of the video, not because keyint was reached. The larger --keyint is the smaller the impact on overall key frame placement should be.
