用 2pass 对视频进行压制，别的内容都还好，就是视频开始那几帧总是模糊
各位有过类似的经历吗？
ffmpeg -hwaccel qsv -i [input] -c:a copy -c:v hevc_qsv -preset slow -b:v 1M -maxrate 4M -bufsize 2M -pass 1 -f mp4 [output]
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