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Old 12th November 2018, 20:55   #4  |  Link
benwaggoner
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Join Date: Jan 2006
Location: Portland, OR
Posts: 4,752
Good advice above. Adding on, using --open-gop can also reduce keyframe strobing. Lowering ipratio can also help. Having a keyframe ever 15 frames is really short. 2 seconds is about the minimum that gets used for IP delivery. 1 sec gets used for Blu-Ray at high bitrates. For making a standalone file, something between 4-10 seconds is good; higher values make for more efficiency but slower random access.
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