.dotfiles/zsh/ffmpeg

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#--------------------------------
# filename: /zsh/ffmpeg
#--------------------------------
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# Original script: https://yohanes.gultom.me/2016/05/21/bash-script-to-batch-convert-mkv-to-mp4-linux/
# Rewritten with ChatGPT 🙈
function ff-mp4 () {
local findpath="${1:-.}"
local file_list=()
local temp_file=$(mktemp)
# Find all video files and write them to a temporary file
find "$findpath" \( -iname '*.mkv' -o -iname '*.flv' -o -iname '*.mov' -o -iname '*.mp4' \) -print0 > "$temp_file"
# Read the file contents into the file_list array
while IFS= read -r -d $'\0' file; do
file_list+=("$file")
done < "$temp_file"
rm "$temp_file" # Delete the temporary file
# Process each file in the file_list array
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local num_files=${#file_list[@]}
local counter=1
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for file in "${file_list[@]}"; do
local dir=$(dirname "$file")
local file_name=$(basename "$file")
local name="${file_name%.*}"
local ext="${file_name##*.}"
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echo "Processing file [$counter/$num_files]: $file_name"
counter=$((counter+1))
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# Re-container the video file to mp4 using ffmpeg
ffmpeg -hide_banner -loglevel error -i "$file" -map 0 -c copy -pix_fmt yuv420p -movflags faststart "$dir/temp_$name.mp4"
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# Rename the original file and move the new mp4 file to its place
mv -n "$file" "$dir/_$file_name"
mv -n "$dir/temp_$name.mp4" "$dir/$file_name"
done
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}
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# Recompress input MP4 to 720p MP4 (copy audio)
ff-recompress720p() {
for input in *.mp4; do
if [[ -f "$input" ]]; then
tempfile="temp_${input%.mp4}"
ffmpeg -hide_banner -i "$input" -map 0 -c:v libx264 -crf 18 -vf scale=1280:-1 -preset slow -tune film -x264-params "ref=5:bframes=5:crf-max=25:qpmax=34:level=3.1:b-adapt=2:direct=auto:deblock=-1,-1:analyse=all:me=umh:subme=9:trellis=2:psy-rd=1,0.15:vbv-bufsize=17500:vbv-maxrate=17500:rc-lookahead=60" -c:a copy -movflags faststart "$tempfile.mp4"
if [[ $? -eq 0 ]]; then
mv "$input" "_$input"
mv "$tempfile.mp4" "$input"
echo "Conversion successful: $input"
else
echo "Conversion failed for: $input"
fi
fi
done
}
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# ffmpeg-convert
# source: https://yohanes.gultom.me/2016/05/21/bash-script-to-batch-convert-mkv-to-mp4-linux/
function ff-ac3-to-stereo() {
findpath=$1
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: "${findpath:="."}"
find "$findpath" \( -iname '*.mkv' -o -iname '*.flv' -o -iname '*.mov' -o -iname '*.mp4' \) | while read -r f ; do
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dir=$(dirname "$f");
file=$(basename "$f");
name="${file%.*}";
ext="${file##*.}";
ffmpeg -hide_banner -loglevel error -i "$f" -map 0 -c:v copy -c:a libfdk_aac -b:a 192k -ac 2 -af volume=2 -movflags faststart "$dir/temp_$name.mp4";
mv "$f" "$dir/_$file";
mv "$dir/temp_$name.mp4" "$dir/$file";
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done
}
# ffmpeg audio-to-ac3
function ff-input-to-ac3() {
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ffmpeg -i "$1" -movflags faststart -map 0 -c:v copy -c:s copy -c:a ac3 -b:a 448k "temp_$1"
mv "$1" "_$1" && mv "temp_$1" "$1"
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}
# ffmpeg fix 16:9 AR
function ff-ar16-9() {
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ffmpeg -i "$1" -c copy -map 0 -bsf:v "h264_metadata=sample_aspect_ratio=4/3" -aspect 16:9 -pix_fmt yuv420p -movflags faststart "temp_$1"
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mv "$1" "_$1" && mv "temp_$1" "$1"
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}
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# ffmpeg fix 5:4 AR
function ff-ar5-4() {
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ffmpeg -i "$1" -c copy -map 0 -bsf:v "h264_metadata=sample_aspect_ratio=1/1" -aspect 5:4 -pix_fmt yuv420p -movflags faststart "temp_$1"
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mv "$1" "_$1" && mv "temp_$1" "$1"
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}
# ffmpeg fix 4:3 AR
function ff-ar4-3() {
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ffmpeg -i "$1" -c copy -map 0 -bsf:v "h264_metadata=sample_aspect_ratio=1/1" -aspect 4:3 -pix_fmt yuv420p -movflags faststart "temp_$1"
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mv "$1" "_$1" && mv "temp_$1" "$1"
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}
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# ffmpeg fix AR ($1 = file, $2 1/1, $4:3)
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function ff-ar-custom() {
if [ $# -lt 3 ]; then
>&2 echo "Not enough arguments (\$1 = 'file', \$2 '1/1', \$3 '4:3')"
return 0
else
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ffmpeg -i "$1" -c copy -map 0 -bsf:v "h264_metadata=sample_aspect_ratio=$2" -aspect $3 -pix_fmt yuv420p -movflags faststart "_$1"
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fi
}
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# ffmpeg fix Non-monotonous DTS
function ff-dts() {
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ffmpeg -fflags +igndts -i "$1" -c copy -pix_fmt yuv420p -movflags faststart "temp_$1"
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mv "$1" "_$1" && mv "temp_$1" "$1"
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}
## ffmpeg wma-to-m4a
function ff-wma-m4a() {
findpath=$1
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: "${findpath:="."}"
find "$findpath" -name '*.wma' | while read -r f ; do
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dir=$(dirname "$f");
file=$(basename "$f");
name="${file%.*}";
ext="${file##*.}";
ffmpeg -hide_banner -loglevel error -i "$f" -map 0 -vn -b:a 192k -c:a libfdk_aac "$dir/temp_$name.mp4";
mv "$f" "$dir/_$file";
mv "$dir/temp_$name.mp4" "$dir/$file";
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done
}