here is how you can restream a source video from one RTMP to Facebook live
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ffmpeg -i "rtmp://yourInputStream.stream" \
-r 30 \
-ar 44100 \
-s 1280x720 \
-c:a libfdk_aac -b:a 90k \
-movflags +faststart \
-preset veryfast -crf 28 \
-tune zerolatency \
-profile:v baseline \
-maxrate 1000k \
-vcodec libx264 \
-bufsize 10000k \
-g 60 \
-max muxing_queue_size 1024 \
-f flv "rtmp://live-api-s.facebook.com:80/rtmp/YOURAPIKEY"
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ok lets break this down a bit:
-r is for output framerate
-ar is for audio rate
-s is for scale – i.e. the size of the video
-c:a is for audio encoding – note that this can be replaced by aac on some distribution