ffmpeg - convertendo vídeos para webm

ffmpeg -i videofinal.mkv -codec:v libvpx -quality good -cpu-used 0 -b:v 1200k -threads 4 videofinal.webm

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ffmpeg - screencast

ffmpeg -f alsa -ac 2 -i pulse -f x11grab -s hd1080 -r 60 -i :0.0 -vcodec libx264 -preset ultrafast -an -y video.mkv -acodec pcm_s16le -b:a 48000k -loglevel quiet -vn -y audio.mkv
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