fix-subtitle-encoding.sh & reencode-with-subs.sh

_readme.md

Example usage

Full example:

QMIN=1 QMAX=4 RESOLUTION=480 SUBTITLE_OPTIONS='FontName=Arial,FontSize=22,OutlineColour=&H10000000,BorderStyle=3' reencode-with-subs mkv

Quality control:

QMIN=1 QMAX=4

Constrain the (vertical) resolution:

RESOLUTION=480

Use all CPU cores:

CUSTOM_OPTIONS='-threads 0'

Take only the first audio stream:

CUSTOM_OPTIONS='-map 0:v -map 0:a:0'

Subtitle rendering options – large font with a semi-opaque background:

SUBTITLE_OPTIONS='FontName=Arial,FontSize=22,OutlineColour=&H10000000,BorderStyle=3'

Same, but with subtitles at the top of the screen:

SUBTITLE_OPTIONS='FontName=Arial,FontSize=22,OutlineColour=&H10000000,BorderStyle=3,Alignment=6'

fix-subtitle-encoding.sh

find . -type f -name '*.srt' | grep -v '/\._' | grep -v original-subs | sort > subs

mkdir -p original-subs

IFS="
"
for f in `cat subs`; do
	echo working on $f
	name=`basename "$f"`
	current_encoding=`file --mime-encoding --brief "$f"`
	if [ "$current_encoding" = "utf-8" ]; then
		echo "Skipping UTF-8 subtitles..."
		continue
	fi
	mv "$f" "original-subs/$name"
	iconv -f cp1251 -t utf8 "original-subs/$name" > $name
done

rm -f subs

reencode-with-subs.sh

set -x

extension="$1"
if [ -z "$extension" ]; then
	extension="avi"
fi

[ -z "$QMIN" ] && QMIN=1
[ -z "$QMAX" ] && QMAX=2

if [ ! -z "$RESOLUTION" ]; then
	VIDEO_FILTERS="scale=-2:$RESOLUTION,setsar=1/1"
else
	VIDEO_FILTERS=""
fi

find . -type f -name "*.$extension" | grep -v '/\._' | grep -v original-videos | sort > videos

mkdir -p original-videos

original_ifs="$IFS"

IFS="
"
for f in `cat videos`; do
	echo working on $f
	name=`basename "$f"`
	folder=`dirname "$f"`
	name_without_ext=`echo "$name" | sed "s/\.$extension\$//"`
	subs="$folder/$name_without_ext.srt"

	mv -v "$f" "original-videos/$name"

	current_video_filters="$VIDEO_FILTERS"

	if [ -f "$subs" ]; then
		echo "Re-rendering $f WITH subs..."

		extra_subtitle_options=""

		if [ ! -z "$SUBTITLE_OPTIONS" ]; then
			extra_subtitle_options=":force_style='$SUBTITLE_OPTIONS'"
		fi

		subtitles_filter="subtitles=${subs}${extra_subtitle_options}"
		if [ ! -z "$VIDEO_FILTERS" ]; then
			current_video_filters="$VIDEO_FILTERS,$subtitles_filter"
		else
			current_video_filters="$subtitles_filter"
		fi

		ffmpeg -threads 0 -i "original-videos/$name" -c:v libxvid -vtag XVID $CUSTOM_OPTIONS -vf $current_video_filters -qmin $QMIN -qmax $QMAX -c:a mp3 -b:a 128k -s:a 48000 -y "$folder/$name_without_ext.avi"
	else
		echo "Re-rendering $f WITHOUT subs..."

		if [ ! -z "$VIDEO_FILTERS" ]; then
			current_video_filters="-vf $VIDEO_FILTERS"
		else
			current_video_filters=""
		fi

		IFS="$original_ifs"
		ffmpeg -threads 0 -i "original-videos/$name" -c:v libxvid -vtag XVID $CUSTOM_OPTIONS $current_video_filters -qmin $QMIN -qmax $QMAX -c:a mp3 -b:a 128k -s:a 48000 -y "$folder/$name_without_ext.avi"
		IFS="
"
	fi
done

rm -f videos