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How to compress video?

source: https://www.bilibili.com/video/BV1sL411x7ix

↓示例：用x265转码，CRF模式，slow预设，音频转为2.0声道128kbps
 ffmpeg -i video.mp4 -c:v libx265 -crf 22 -preset slow -c:a aac -ac 2 -b:a 128k  output.mp4
↓示例：用x265转码，ABR模式，5000kbps码率，并复制音频轨道
 ffmpeg -i video.mp4 -c:v libx265  -b:v 5000k -c:a copy  output.mp4