TLDR
Enter a command. For example: helix, rbac lookup, stty, nix collect garbage.

ffmpeg

 
Video conversion tool. More information: https://ffmpeg.org.
 
  • Extract the sound from a video and save it as MP3:
     
    ffmpeg -i {{video.mp4}} -vn {{sound}}.mp3
     
  • Save a video as GIF, scaling the height to 1000px and setting framerate to 15:
     
    ffmpeg -i {{video.mp4}} -vf 'scale=-1:{{1000}}' -r {{15}} {{output.gif}}
     
  • Combine numbered images (frame_1.jpg, frame_2.jpg, etc) into a video or GIF:
     
    ffmpeg -i {{frame_%d.jpg}} -f image2 {{video.mpg|video.gif}}
     
  • Quickly extract a single frame from a video at time mm:ss and save it as a 128x128 resolution image:
     
    ffmpeg -ss {{mm:ss}} -i {{video.mp4}} -frames 1 -s {{128x128}} -f image2 {{image.png}}
     
  • Trim a video from a given start time mm:ss to an end time mm2:ss2 (omit the -to flag to trim till the end):
     
    ffmpeg -ss {{mm:ss}} -to {{mm2:ss2}} -i {{video.mp4}} -codec copy {{output.mp4}}
     
  • Convert AVI video to MP4. AAC Audio @ 128kbit, h264 Video @ CRF 23:
     
    ffmpeg -i {{input_video}}.avi -codec:audio aac -b:audio 128k -codec:video libx264 -crf 23 {{output_video}}.mp4
     
  • Remux MKV video to MP4 without re-encoding audio or video streams:
     
    ffmpeg -i {{input_video}}.mkv -codec copy {{output_video}}.mp4
     
  • Convert MP4 video to VP9 codec. For the best quality, use a CRF value (recommended range 15-35) and -b:video MUST be 0:
     
    ffmpeg -i {{input_video}}.mp4 -codec:video libvpx-vp9 -crf {{30}} -b:video 0 -codec:audio libopus -vbr on -threads {{number_of_threads}} {{output_video}}.webm

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