https://trac.ffmpeg.org/wiki/Limiting%20the%20output%20bitrate
maxrate对rc=abr不起效果，仅在cbr、vbr有效？
测试用cbr、vbr模式确实可以控制
帖子补充，，bufsize值设置小一点就行了，就可以控制了，比如平均码率的2倍（代表2秒检测一次）
Simplified Chinese
2020.02.07 21:12
maxrate对rc=abr不起效果，仅在cbr、vbr有效？
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