new note - adjust crf

pyratebeard commited 2019-06-05 14:09:05 +0100 commit af75a31662cc76582e92a6ea5a38880b7c1ab3f9

				technology/linux/audio_visual/ffmpeg.md
			
          @@ -20,3 +20,9 @@ ffmpeg  -f alsa -ac 2 -i alsa -f x11grab -r 15 -i :0.0 -acodec libmp3lame -vcode

           ```

           ffmpeg -i videofile.mp4 videofile.webm

           ```

          +

          +### adjust crf

          +adjust constant rate factor to lower bit rate

          +```

          +ffmpeg -i input.mp4 -vcodec libx264 -crf 20 output.mp4

          +```

...	...	@@ -20,3 +20,9 @@ ffmpeg -f alsa -ac 2 -i alsa -f x11grab -r 15 -i :0.0 -acodec libmp3lame -vcode
20	20	```
21	21	ffmpeg -i videofile.mp4 videofile.webm
22	22	```
	23	+
	24	+### adjust crf
	25	+adjust constant rate factor to lower bit rate
	26	+```
	27	+ffmpeg -i input.mp4 -vcodec libx264 -crf 20 output.mp4
	28	+```