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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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