ffmpeg

Presents

For applying in Batch: for %f in (*.ext) do ffmpeg -i "%f" [command] "e-%~nf.ext"
trim: ffmpeg -i file.ext -ss 00:00 -to 00:00 -c copy file.ext
reduce video size: for %f in (*.mp4) do ffmpeg -i "%f" -crf 28 "e-%~nf.mp4"
audiobook: for %f in (*.mp3) do ffmpeg -i "%f" -c:a libopus -b:a 48k "e-%~nf.opus"
reduce images size: for %f in (*.jpg) do ffmpeg -i "%f" -q:v 3 "e-%~nf.jpg"
Watermark: ffmpeg -i input.mkv -i watermark.png -filter_complex "overlay=50:50" output.mkv
Chroma Key: ffmpeg -i input.mkv -c:v vp9 -filter:v "chromakey=0x00ff00:0.1:0.2" output.webm
Overlay Videos: ffmpeg -i input.mkv -i input2.mkv -filter_complex "[0:v][1:v] overlay=25:25" output.webm

base command: ffmpeg -i input.ext output.ext
copy metadata: -map_metadata 0
VF:
- resizing: -vf scale=[scale] W:H or -1 to auto calculate
- Cropping: -vf crop=[W:H:x:y]
- brightness and contrast: -vf eq=brightness=0.06
- Rotating: -vf "transpose=1"
- Grayscale: -vf format=gray
- combine: -vf "scale=1280:-1,crop=1280:720"
image quality: -q:v [1-31]
video quality: -crf [18-51]
Trim Video:
- start time: -ss
- duration relative to start: -t
- end time: -to
- copy codec: -c copy
video codec: -c:v [video.codec] "libx265" "copy"
audio codec: -c:a [audio.codec] "libopus"
video bitrate: -b:v [video bitrate]
audio bitrate: -b:a [audio bitrate]
FPS: -r [fps]
resolution: -s [resolution]
no video: -vn