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Update ffmpeg.md

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cmd/ffmpeg.md
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* assemble from frames `ffmpeg -i frames_out/frame%04d.jpg -r 29.97 lcd_out.mp4 `
* extract audio `ffmpeg -i lcd.mkv -vn -acodec copy lcd.mp4`
* merge audio and video `ffmpeg -i lcd_out.mp4 -i lcd.mp4 -acodec copy out.mp4`
* audio and picture to video `ffmpeg -loop 1 -i louie3.jpg -i output_audio.mp3 -shortest -c:v libx264 -crf 23 -c:a aac -b:a 128k -vf "scale=720:720,format=yuv420p" out2.mp4`
* audio and picture to video suitable for whatsapp`ffmpeg -loop 1 -i louie3.jpg -i output_audio.mp3 -shortest -c:v libx264 -crf 23 -c:a aac -b:a 128k -vf "scale=720:720,format=yuv420p" out2.mp4`