ffmpeg -i d:\开发事业部009.mp4 -ac 1 -y d:\2.mp4
dis transceiver interface GigabitEthernet 1/0/1 verbose
录屏ffmpeg.exe -t 00:45:16 -f dshow -i video="screen-capture-recorder":audio="virtual-audio-capturer" -af volume=1dB -pix_fmt yuv420p -copyinkf -r 25 -preset ultrafast -rtbufsize 100
查看最大传输单元MTUnetsh interface ipv4 show subinterfaces用PING测试是否需要拆分数据包ping -l 1472 -f www.123.nt
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