ffmpeg

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1. Installation
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mac:
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brew install ffmpeg
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linux:
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yum -y install ffmpeg
at the end of /etc/profile:
export FFMPEG_HOME=/usr/ local/ffmpeg
export PATH=$FFMPEG_HOME/bin:$PATH
compile:
source /etc/profile
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2. Command:
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1. Extract all pictures
-r specifies the extracted frame rate, that is, the number of pictures per second extracted from the video. 1 means decimating one frame per second.
-f Specifies the format used to save the image, which can be ignored.
image-%3d.jpeg, specifies the output name of the file.
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ffmpeg -i WeChatSight2.mp4 -r 1 -f image2 image-%3d.jpeg
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2. Take the first frame
-t duration (otherwise One way of writing "-ss","00:00:00","-t","00:00:01")
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ffmpeg -i WeChatSight2.mp4 -r 1 -t 1 -f image2 image-%3d.jpeg
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3.





/usr/local/bin/ffmpeg -y -i WeChatSight2.mp4 -vframes 1 -ss 0:0:0 -f mjpeg -s 800*600 -an /Users/samson/Desktop/1.png

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Push stream to rtmp protocol address
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ffmpeg -re -i /Users/Rick/Movies/Demo.mov -vcodec copy -f flv rtmp://localhost:1935/ live1/room1