useful ffmpeg examples difficult to remember

ffmpeg_examples.md

• Increase/decrease audio tempo/speed this is represented as a percentage. ie: 1.5=1½× normal speed

atempo={0.5-100}

• Remove logo in bottom right-hand corner

delogo=x=620:y=495:w=330:h=40

• Fade in/out video (fade out is dependent on number of frames)

fade=in:0:500,fade=out:21500:400

• Loop a stream N number of times (or infinitely if '-1')

-stream_loop -1 -i <inputfile> this must go BEFORE the stream you want to loop

• Clip a video into segments quickly (bsf can be applied, but results are unreliable)

<inputfile> -segment_time <UNIX time, 00:00:00.00 or 00s> -f segment -reset_timestamps 1 <outfile>_%03d.<ext>

• Fade in/out audio (these durations are in seconds, not in frames like video)

-af afade=t=in:ss=<start-time>:d=<duration>,afade=t=out:st=<fade-start>:d=<fade-duration>

• Record monitor source audio in lossless format

ffmpeg -f pulse -i default output.wav or ffmpeg -i pulse -i default output.opus for compressed

• Wipe all metadata from a media file. Use as an option to other ffmpeg command or by itself.

-map_metadata 1

Honerable Mentions

• count the number of video frames in a file quickly

mediainfo --Output="Video;%FrameCount%" <inputfile>

• Flip a video horizontally useful for avoiding contentid scans

-i input.mp4 -vf "hflip" output.mp4