29 lines
1.5 KiB
Bash
Executable File
29 lines
1.5 KiB
Bash
Executable File
#!/usr/bin/env bash
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set -euo pipefail
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colorprint() {
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echo -e "\e[31m${1}\e[0m"
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}
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SCRIPT_NAME=$(basename "$0")
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test -z "${1}" && echo "File not specified or doesn't exist, aborting. Usage: $SCRIPT_NAME \$FILENAME \$LANGUAGE_TO_KEEP" && exit 1
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FILENAME=$1
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# default language to keep is second parameter, or japanese if unspecified
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LANGUAGE_TO_KEEP="${2:-jpn}"
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echo -n "Processing "
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colorprint "$FILENAME"
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# capture JSON output and remove the excessively large code_private_data field
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JSON_OUTPUT=$(mkvmerge -J "$FILENAME" | jq '[ .tracks[] | select(.type=="audio") | del(.properties.codec_private_data) ]')
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TRACK_COUNT=$(echo "$JSON_OUTPUT" | jq length)
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# check if more than 1 audio track is present
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[[ $TRACK_COUNT -lt 2 ]] && echo -e "\tFile has only 1 track, skipping." && exit 1
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# check if tracks other than the one to keep are present
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UNDESIRED_TRACK_COUNT=$(echo "$JSON_OUTPUT" | jq "[.[] | select(.properties.language!=\"${LANGUAGE_TO_KEEP}\")] | length")
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[[ $UNDESIRED_TRACK_COUNT -eq 0 ]] && echo -e "\tFile has only '$LANGUAGE_TO_KEEP' tracks, skipping." && exit 1
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FILENAME_EXT=${FILENAME##*.}
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echo -e "\tRemoving all audio tracks except '$LANGUAGE_TO_KEEP' tracks..."
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TMPFILE=$(mktemp --dry-run --suffix=.${FILENAME_EXT})
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echo -e "\tOutputting to temporary file ${TMPFILE}..."
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! pv "$FILENAME" | ffmpeg -i pipe:0 -map 0:v -map 0:a:m:language:${LANGUAGE_TO_KEEP} -map 0:s -c copy -v error "${TMPFILE}" && echo "Something went wrong, aborting." && exit
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echo -e "\tReplacing ${FILENAME} with ${TMPFILE}..."
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mv "${TMPFILE}" "$FILENAME"
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