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| #!/usr/bin/env bash | |
| PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/bin:$PATH | |
| set -e | |
| basedir="$(dirname "$(readlink -f "$0")")" | |
| tempdir=$(mktemp -d) | |
| trap 'rm -rf "$tempdir"' EXIT | |
| cd "$tempdir" || exit 1 | |
| vidurl="$1" | |
| maxsize="$2" | |
| maxsizedef="5" # output: max. filezize in megabyte | |
| videohigh="640" # output: videohigh in pixel | |
| if [ -z "$maxsize" ]; then maxsize="$maxsizedef"; fi | |
| echo "max. filezize = $maxsize MB" | |
| ytargs=(-q -i --ignore-config --add-metadata --restrict-filenames -o "%(uploader)s-%(title)s-%(id)s.%(ext)s") | |
| format=(-f 'bestvideo[ext=mp4][height<=?720]+bestaudio[ext=m4a]') | |
| echo "Downloading video..." | |
| youtube-dl -e "$vidurl" | |
| youtube-dl "${ytargs[@]}" "${format[@]}" "$vidurl" | |
| for file in *.mp4; do filename="${file%.*}"; done | |
| videolength=$(ffprobe -i "${filename}.mp4" -show_entries format=duration -v quiet -of csv="p=0" | awk '{printf("%d\n",$1 + 0.5)}') | |
| audiobitrate="64" | |
| realbitrate=$((((((maxsize * 2**20) / videolength) / 1000) * 8) - audiobitrate)) | |
| videobitrate=$(((realbitrate / 100) * 80)) | |
| bufsize=$(((videobitrate * 6) / 10)) | |
| initoccupancy=$((videobitrate * 4 )) | |
| eval "$(ffprobe -v error -of flat=s=_ -select_streams v:0 -show_entries stream=height,width "${filename}.mp4")" | |
| imagesize=$((streams_stream_0_width * streams_stream_0_height)) | |
| if [ "$imagesize" -ge "2073600" ]; then | |
| slices="4" # 1080p (1920*1080) | |
| elif [ "$imagesize" -ge "921600" ]; then | |
| slices="3" # 720p (1280*720) | |
| elif [ "$imagesize" -ge "307200" ]; then | |
| slices="2" # 480p (640*480) | |
| else | |
| slices="1" | |
| fi | |
| echo "Converting video..." | |
| echo "Video length: $(ffprobe "${filename}.mp4" -show_entries format=duration -v quiet -of csv="p=0" -sexagesimal)" | |
| ffmpeg -v quiet -stats -i "${filename}.mp4" \ | |
| -c:v libvpx -pix_fmt yuv420p -threads 8 -slices ${slices} -ac 2 -c:a libvorbis -minrate:v ${videobitrate}k -b:v ${videobitrate}k -maxrate:v ${videobitrate}k \ | |
| -bufsize ${bufsize}k -rc_init_occupancy ${initoccupancy}k -qcomp 0 -b:a 64k -vf scale=${videohigh}:-1 \ | |
| "${filename}.webm" | |
| mv "${filename}.webm" "$basedir" | |
| echo "Finished! Output: ${filename}.webm" | |
| echo "Bitrate: ${videobitrate}k" |
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