Ffmpeg

Commands

  • ffmpeg -i file = Show info about file
  • ffmpeg -i file -acodec libmp3lame -ab 320k file.mp3 = Extract only audio from file and encode it at 320kb/s as mp3
  • ffmpeg -i file -acodec pcm_s16le file.wav = Extract only audio from file and encode it as wav
  • ffmpeg -f x11grab -qscale n -s WidthxHeight -r fps -i :0.0+x,y file = Capture what’s on screen on a video of size WidthxHeight, at given fps and using the X server :0.0, starting from pixel x and y (counting from the top left corner of the screen). Set quality with -qscale, where n=1 is best and n=31 is worst quality
  • ffmpeg -v 2 -y -i file.ts -b 1200k -bt 4000k -vcodec mpeg4 -pass 1 -an file_output e ffmpeg -v 2 -y -i file.ts -b 18000k -bt 18000k -vcodec mpeg4 -pass 2 -acodec libmp3lame -ac 2 -ar 48000 -ab 128k file_output = 2 pass conversion from ts to avi (mpeg4). Increase values of -b and -bt to increase output quality
  • -ss hh:mm:ss = Start at the given time
  • -t hh:mm:ss o -t number = Stop processing at given time or after number of minutes
  • ffmpeg -acodec copy -vcodec copy -ss hh:mm:ss -t hh:mm:ss -i file file_output = Extract, without encoding, from file between the two time given
  • ffmpeg -acodec flac -ab 192k -i input_file output_file = Reencodes corrupted or out of sync flac files

Conversions

H264

ffmpeg -i inputfile -vcodec h264 -acodec aac -strict -2 outputfile.mp4

VP8

ffmpeg -i inputfile -vcodec libvpx -qmin 0 -qmax 50 -crf 10 -b:v 1M -acodec libvorbis outputfile.webm

VP9

ffmpeg -i inputfile -vcodec libvpx-vp9 -b:v 1M -acodec libvorbis outputfile.webm

Gif to VP8

ffmpeg -y -i input.gif -r 16 -c:v libvpx -quality good -cpu-used 0 -b:v 2M -crf 12 -pix_fmt yuv420p -movflags faststart outputfile.webm