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ffmpeg -f lavfi -i 'testsrc2=size=1280x720:rate=60,format=yuv420p' \
-f lavfi -i 'sine=frequency=440:sample_rate=48000:beep_factor=4' \
-c:v libx264 -preset ultrafast -tune zerolatency -profile:v high \
-b:v 1400k -bufsize 2800k -x264opts keyint=120:min-keyint=120:scenecut=-1 \
-c:a aac -b:a 32k -f flv rtmp://transcoder/encoder/colorbar
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