56 lines
1.7 KiB
Bash
56 lines
1.7 KiB
Bash
#!/usr/bin/env bash
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MAX_MB=10
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usage() {
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cat <<'EOF'
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Usage: shrink [-s MB] <input> [output]
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Compress a video to a target file size using two-pass x264 encoding.
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Options:
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-s MB Target file size in MB (default: 10)
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-h Show this help
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If output is omitted, saves to <input>-shrunk.mp4.
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EOF
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exit 0
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}
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while getopts ":s:h" opt; do
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case $opt in
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s) MAX_MB=$OPTARG ;;
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h) usage ;;
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:) echo "Option -$OPTARG requires an argument" >&2; exit 1 ;;
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*) usage ;;
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esac
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done
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shift $((OPTIND - 1))
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input=${1:?Usage: shrink [-s MB] <input> [output]}
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output=${2:-${input%.mp4}-shrunk.mp4}
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[[ -f $input ]] || { echo "File not found: $input" >&2; exit 1; }
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file_bytes=$(stat -c%s "$input")
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max_bytes=$((MAX_MB * 1048576))
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file_mb=$(awk "BEGIN {printf \"%.1f\", $file_bytes / 1048576}")
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if [[ $file_bytes -le $max_bytes ]]; then
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echo "Already ${file_mb}MB (under ${MAX_MB}MB), nothing to do"
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exit 0
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fi
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duration=$(ffprobe -v error -show_entries format=duration -of csv=p=0 "$input")
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audio_bitrate=128
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video_bitrate=$(awk "BEGIN {v = ($MAX_MB * 8192 / $duration) - $audio_bitrate; printf \"%d\", (v > 0 ? v : 1)}")
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echo "Compressing ${file_mb}MB → ${MAX_MB}MB target..."
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echo " Pass 1/2 (video: ${video_bitrate}kbps)..."
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ffmpeg -y -i "$input" -c:v libx264 -b:v "${video_bitrate}k" -pass 1 -an -f null /dev/null 2>/dev/null
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echo " Pass 2/2..."
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ffmpeg -y -i "$input" -c:v libx264 -b:v "${video_bitrate}k" -pass 2 -c:a aac -b:a "${audio_bitrate}k" "$output" 2>/dev/null
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rm -f ffmpeg2pass-0.log ffmpeg2pass-0.log.mbtree
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final_mb=$(awk "BEGIN {printf \"%.1f\", $(stat -c%s "$output") / 1048576}")
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echo "Done: ${file_mb}MB → ${final_mb}MB → $output"
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