ffmpeg-video-filters

# FFmpeg Video Filters Skill Apply video filters for scaling, cropping, watermarks, speed changes, and visual effects. ## When to Use - Resize videos - Crop video frames - Add watermarks or overlays - Change playback speed - Apply blur or other effects - Adjust brightness/contrast ## Scaling ```bash # Scale to 720p (maintain aspect ratio) ffmpeg -i input.mp4 -vf scale=-2:720 output.mp4 # Scale to specific width (maintain aspect ratio) ffmpeg -i input.mp4 -vf scale=1280:-2 output.mp4 # Scale to exact dimensions (may distort) ffmpeg -i input.mp4 -vf scale=1920:1080 output.mp4 # Scale with algorithm ffmpeg -i input.mp4 -vf scale=1280:720:flags=lanczos output.mp4 ``` ## Cropping ```bash # Crop to 16:9 from center ffmpeg -i input.mp4 -vf "crop=1920:1080" output.mp4 # Crop with offset (x:y:width:height) ffmpeg -i input.mp4 -vf "crop=1920:1080:0:0" output.mp4 # Crop from specific position ffmpeg -i input.mp4 -vf "crop=800:600:100:50" output.mp4 ``` ## Watermarks and Overlays ```bash # Add image watermark (top-left) ffmpeg -i input.mp4 -i logo.png \ -filter_complex "overlay=10:10" output.mp4 # Bottom-right watermark ffmpeg -i input.mp4 -i logo.png \ -filter_complex "overlay=W-w-10:H-h-10" output.mp4 # Center watermark ffmpeg -i input.mp4 -i logo.png \ -filter_complex "overlay=(W-w)/2:(H-h)/2" output.mp4 ``` ## Speed Changes ```bash # Speed up 2x ffmpeg -i input.mp4 -vf "setpts=0.5*PTS" -af "atempo=2.0" output.mp4 # Slow down 0.5x ffmpeg -i input.mp4 -vf "setpts=2.0*PTS" -af "atempo=0.5" output.mp4 # Speed up video only (no audio) ffmpeg -i input.mp4 -vf "setpts=0.5*PTS" -an output.mp4 ``` ## Blur Effects ```bash # Blur entire video ffmpeg -i input.mp4 -vf "boxblur=10:5" output.mp4 # Blur specific region (coordinates x:y:w:h) ffmpeg -i input.mp4 -vf "boxblur=10:5:x=100:y=100:w=200:h=200" output.mp4 # Gaussian blur ffmpeg -i input.mp4 -vf "gblur=sigma=5" output.mp4 ``` ## Brightness and Contrast ```bash # Adjust brightness and contrast ffmpeg -i input.mp4 -vf "eq=brightness=0.1:contrast=1.2" output.mp4 # Increase brightness ffmpeg -i input.mp4 -vf "eq=brightness=0.2" output.mp4 # Adjust saturation ffmpeg -i input.mp4 -vf "eq=saturation=1.5" output.mp4 ``` ## Rotation ```bash # Rotate 90 degrees clockwise ffmpeg -i input.mp4 -vf "transpose=1" output.mp4 # Rotate 90 degrees counter-clockwise ffmpeg -i input.mp4 -vf "transpose=2" output.mp4 # Rotate 180 degrees ffmpeg -i input.mp4 -vf "transpose=1,transpose=1" output.mp4 ``` ## Multiple Filters ```bash # Chain multiple filters ffmpeg -i input.mp4 -vf "scale=1280:720,crop=800:600:100:50" output.mp4 # Complex filter chain ffmpeg -i input.mp4 -i logo.png \ -filter_complex "[0:v]scale=1280:720[scaled];[scaled][1:v]overlay=10:10" \ output.mp4 ``` ## Fade Effects ```bash # Fade in (first 2 seconds) ffmpeg -i input.mp4 -vf "fade=t=in:st=0:d=2" output.mp4 # Fade out (last 2 seconds) ffmpeg -i input.mp4 -vf "fade=t=out:st=10:d=2" output.mp4 # Fade in and out ffmpeg -i input.mp4 -vf "fade=t=in:st=0:d=2,fade=t=out:st=8:d=2" output.mp4 ``` ## Notes - Use `-vf` for video filters - Multiple filters separated by commas - Use `-filter_complex` for complex operations - Overlay positions: W=width, H=height, w=overlay width, h=overlay height - Speed changes require both video (setpts) and audio (atempo) filters