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⚐ tools

ffmpeg settings

OSX readable mov > mp4

  • add -pix_fmt yuv420p
  • additionaly define codec: -vcodec libx264  respectively -codec:v libx264

(copy/paste: )

Encode for YouTube:

ffmpeg -i <input file> -codec:v libx264 -crf 21 -bf 2 -flags +cgop -pix_fmt yuv420p -codec:a aac -strict -2 -b:a 384k -r:a 48000 -movflags faststart <output_name>.mp4

Source

Scaling

  • e.g: -vf scale=320:-1 source
  • Inputs: integer (eg. 320) , -1 (preserve aspect ratio) or iw / ih (input width/height) source

Rotate

eg. (90 deg Clockwise):

-vf "transpose=1" 0 = 90CounterCLockwise and Vertical Flip (default) 1 = 90Clockwise 2 = 90CounterClockwise 3 = 90Clockwise and Vertical Flip
180 deg: -vf "transpose=2,transpose=2"

Source

Batch processing

for i in *.mov;
 do name=`echo $i | cut -d'.' -f1`;
 echo $name;
 ffmpeg -i "$i" -pix_fmt yuv420p -vcodec libx264 "${name}.mp4";
done

stop motion

Image sequence to video

ffmpeg -f image2 -i image%d.jpg -vcodec libx264 -b 800k video.mp4

Framerate

-framerate 15

see: FFMPEG An Intermediate Guide/image sequence / stackoverflow

 

Metadata

see: Supplying FFmpeg With Metadata

Analyse videos with ffprobe

basic usage: ffprobe file.mp4

only show width and height

ffprobe -v error -show_entries stream=width,height \
  -of default=noprint_wrappers=1 input.mp4

source

only show framerate

ffprobe -v error -select_streams v:0 -show_entries stream=avg_frame_rate -of default=noprint_wrappers=1:nokey=1 input.mp4
  • Example output for a NTSC-film video: 24000/1001
  • Example output for a PAL video: 25/1

Varia

  • remove audio: -an
  • remove video: -vn

source

Further Reading