ページ毎にキーフレームを強制#2

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mizar wants to merge 3 commits intovrc-lt:mainfrom

Commits on Apr 6, 2024

`-bf 0`: Curbing the use of Bframes
mizar
committed

Commits on Apr 8, 2024

-progress, force_key_frames
mizar
committed

Commits on Apr 9, 2024

force key frames: each 2s -> 1s
mizar
committed