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portable shell script to compress videos with ffmpeg
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| #!/bin/sh | |
| print_usage() { | |
| echo "usage: compress_video <input_file>" | |
| echo "supported formats: mp4, webm, mkv, mov, avi, flv" | |
| } | |
| get_extension() { | |
| f="${1##*/}" | |
| case "$f" in | |
| .*) get_extension "${f#.}" && return 0 ;; | |
| esac | |
| case "$f" in | |
| .*.*) echo "${f#.}" ;; | |
| *.*) echo "${f#*.}" ;; | |
| *) return 0 ;; | |
| esac | |
| } | |
| get_filepath_without_extension() { | |
| ext=$(get_extension "$1") | |
| echo "${1%."$ext"}" | |
| } | |
| if [ $# -ne 1 ]; then | |
| echo "ERROR: input file is required" | |
| print_usage | |
| exit 1 | |
| fi | |
| input_file="$1" | |
| if [ ! -f "$input_file" ]; then | |
| echo "ERROR: input file '$input_file' does not exist" | |
| exit 1 | |
| fi | |
| input_file_ext="$(get_extension "$input_file")" | |
| output_file="$(get_filepath_without_extension "$input_file")_compressed.$input_file_ext" | |
| # Default to libx264 and aac for unknown formats | |
| vcodec="libx264" | |
| acodec="aac" | |
| format_opt="" | |
| case $input_file_ext in | |
| mp4) | |
| vcodec="libx264" | |
| acodec="aac" | |
| ;; | |
| mov) | |
| vcodec="libx264" | |
| acodec="aac" | |
| format_opt="-f mov" | |
| ;; | |
| webm) | |
| vcodec="libvpx-vp9" | |
| acodec="libopus" | |
| ;; | |
| mkv) | |
| vcodec="libx265" | |
| acodec="libopus" | |
| ;; | |
| avi|flv) | |
| vcodec="libx264" | |
| acodec="aac" | |
| format_opt="-f mp4" | |
| output_file="$(get_filepath_without_extension "$input_file")_compressed.mp4" | |
| ;; | |
| *) | |
| echo "WARNING: unsupported video format - trying with default codecs" | |
| ;; | |
| esac | |
| echo "compressing video. this could take a while..." | |
| if ffmpeg -i "$input_file" -c:v $vcodec -crf 23 -preset medium -c:a $acodec $format_opt "$output_file"; then | |
| echo "compression completed successfully" | |
| echo "output file: $output_file" | |
| else | |
| echo "ERROR: compression failed" | |
| exit 1 | |
| fi |
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