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Blackout a Region of Interest (ROI) in a video for a given time window.
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| #!/bin/bash | |
| ###################################################################### | |
| # blackout_roi.sh | |
| # | |
| # 🔳 Blackout a Region of Interest (ROI) in a video for a given time window. | |
| # | |
| # 🎯 Usage: | |
| # ./blackout_roi.sh input.mp4 ROI t1 duration output.mp4 [x y w h] | |
| # | |
| # ROI options: | |
| # Center – Vertical center strip (excluding 1/4 on each side) | |
| # Left – Left half of the frame | |
| # Right – Right half of the frame | |
| # Top – Top half of the frame | |
| # Bottom – Bottom half of the frame | |
| # TopLeft – Upper-left quarter | |
| # TopRight – Upper-right quarter | |
| # BottomLeft – Lower-left quarter | |
| # BottomRight – Lower-right quarter | |
| # custom – Manually define ROI via x y w h (pixels) | |
| # | |
| # 💡 Examples: | |
| # ./blackout_roi.sh input.mp4 Center 10 4 output.mp4 | |
| # ./blackout_roi.sh input.mp4 custom 12 5 output.mp4 100 50 300 200 | |
| ###################################################################### | |
| if [ "$#" -lt 5 ]; then | |
| echo "Usage: $0 input.mp4 ROI t1 duration output.mp4 [x y w h]" | |
| exit 1 | |
| fi | |
| INPUT="$1" | |
| ROI="$2" | |
| T1="$3" | |
| DURATION="$4" | |
| OUTPUT="$5" | |
| T2=$(echo "$T1 + $DURATION" | bc) | |
| # Get video resolution | |
| RESOLUTION=$(ffprobe -v error -select_streams v:0 -show_entries stream=width,height \ | |
| -of csv=p=0:s=x "$INPUT") | |
| WIDTH=$(echo "$RESOLUTION" | cut -d'x' -f1) | |
| HEIGHT=$(echo "$RESOLUTION" | cut -d'x' -f2) | |
| if [[ -z "$WIDTH" || -z "$HEIGHT" ]]; then | |
| echo "❌ Error: Could not determine video resolution" | |
| exit 1 | |
| fi | |
| # ROI definitions | |
| case "$ROI" in | |
| Center) | |
| X=$(($WIDTH / 4)) | |
| Y=0 | |
| W=$(($WIDTH / 2)) | |
| H=$HEIGHT | |
| ;; | |
| Left) | |
| X=0 | |
| Y=0 | |
| W=$(($WIDTH / 2)) | |
| H=$HEIGHT | |
| ;; | |
| Right) | |
| X=$(($WIDTH / 2)) | |
| Y=0 | |
| W=$(($WIDTH / 2)) | |
| H=$HEIGHT | |
| ;; | |
| Top) | |
| X=0 | |
| Y=0 | |
| W=$WIDTH | |
| H=$(($HEIGHT / 2)) | |
| ;; | |
| Bottom) | |
| X=0 | |
| Y=$(($HEIGHT / 2)) | |
| W=$WIDTH | |
| H=$(($HEIGHT / 2)) | |
| ;; | |
| TopLeft) | |
| X=0 | |
| Y=0 | |
| W=$(($WIDTH / 2)) | |
| H=$(($HEIGHT / 2)) | |
| ;; | |
| TopRight) | |
| X=$(($WIDTH / 2)) | |
| Y=0 | |
| W=$(($WIDTH / 2)) | |
| H=$(($HEIGHT / 2)) | |
| ;; | |
| BottomLeft) | |
| X=0 | |
| Y=$(($HEIGHT / 2)) | |
| W=$(($WIDTH / 2)) | |
| H=$(($HEIGHT / 2)) | |
| ;; | |
| BottomRight) | |
| X=$(($WIDTH / 2)) | |
| Y=$(($HEIGHT / 2)) | |
| W=$(($WIDTH / 2)) | |
| H=$(($HEIGHT / 2)) | |
| ;; | |
| custom) | |
| if [ "$#" -ne 9 ]; then | |
| echo "❌ Error: For 'custom' ROI, you must provide x y w h" | |
| echo "Usage: $0 input.mp4 custom t1 duration output.mp4 x y w h" | |
| exit 1 | |
| fi | |
| X="$6" |
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