160 lines
3.9 KiB
Bash
Executable File
160 lines
3.9 KiB
Bash
Executable File
#!/bin/sh
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## TODO: option to replace original file.
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## TODO: audio quality. Copy if AAC or OGG <320k.
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## TODO: crop options.
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## TODO: handle srt encoding.
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if [ -z "$(command -v ffmpeg)" ]; then
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echo "ffmpeg required."
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exit
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fi
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_printhelp()
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{
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cat <<EOF
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Usage: ${1##*/} [OPTIONS] FILES|FOLDERS
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Transcode FILES or files found in FOLDERS to .mkv with x264 and ogg. Output
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files are the same as the original, with time appended. You can customize
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encoding with the TC_* variables.
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-c: Copy streams (no reencoding).
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-f: Overwrite existing file if any.
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-h: Display this help.
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-o OPT: Additional options.
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-s: Sample of 5 minutes.
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-S MIN: Sample of MIN minutes.
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-t: Remove all "title" metadata.
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Examples:
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* Exchange stream 1 an 2 by first removing them, then reading them in the
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desired order.
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${1##*/} -o '-map -0:1 -map -0:2 -map 0:2 -map 0:1' input.mkv
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* Change audio stream 1 title and remove audio stream 2 title:
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${1##*/} -o '-metadata:s:a:0 title="FR: OGG Stereo" -metadata:s:a:1 title=' input.mkv
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EOF
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}
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TC_SAMPLE=""
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TC_USER_OPT=""
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TC_REMOVE_TITLE=false
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TC_VIDEO_CODEC="libx264"
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TC_AUDIO_CODEC="libvorbis"
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TC_VIDEO_OPT="-preset slow -crf 20"
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## What to do if file exists:
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# -y overwrite
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# -n do not overwrite.
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TC_OVERWRITE="-n"
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## WARNING: we mix down audio to 2 channels with '-ac 2'. This greatly reduce
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## file size and avoid any confusion for playback, which is often the case when
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## converting DTS to any other format because DTS has embedded channel
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## description which is not available in other formats.
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TC_AUDIO_OPT="-b:a 192k -ac 2"
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while getopts ":cfho:sS:t" opt; do
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case $opt in
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c)
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TC_VIDEO_OPT=""
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TC_AUDIO_OPT=""
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TC_VIDEO_CODEC="copy"
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TC_AUDIO_CODEC="copy" ;;
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f)
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TC_OVERWRITE="-y" ;;
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h)
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_printhelp "$0"
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exit 1 ;;
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o)
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TC_USER_OPT="$OPTARG" ;;
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s)
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TC_SAMPLE="-ss 60 -t 360" ;;
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S)
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TC_SAMPLE="-ss 60 -t $((60*$OPTARG))" ;;
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t)
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TC_REMOVE_TITLE=true ;;
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?)
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_printhelp "$0"
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exit 1 ;;
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:)
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echo "Missing argument."
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_printhelp "$0"
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exit 1 ;;
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esac
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done
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shift $(($OPTIND - 1))
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if [ $# -eq 0 ]; then
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_printhelp "$0"
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exit
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fi
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## Zsh compatibility. We need it otherwise word splitting of parameter like
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## TC_SAMPLE will not work.
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STATUS="$(set -o | grep 'shwordsplit' | awk '{print $2}')"
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[ "$STATUS" = "off" ] && set -o shwordsplit
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_tc_transcode()
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{
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cat<<EOF
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================================================================================
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User options: ${TC_USER_OPT:-None}
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Sample: ${TC_SAMPLE:-No}
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Clear 'Title': $TC_REMOVE_TITLE
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================================================================================
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EOF
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STREAM_TITLE=""
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if $TC_REMOVE_TITLE; then
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STREAM_NUM=$(ffmpeg -i "$1" 2>&1 | grep -c 'Stream')
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for i in $(seq 0 $STREAM_NUM); do
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STREAM_TITLE="${STREAM_TITLE}-metadata:s:$i title= "
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done
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fi
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ffmpeg $TC_OVERWRITE -i "$1" \
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-c:v $TC_VIDEO_CODEC $TC_VIDEO_OPT \
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-c:a $TC_AUDIO_CODEC $TC_AUDIO_OPT \
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-c:s copy \
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-map 0 $STREAM_TITLE \
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$TC_SAMPLE $TC_USER_OPT "${1%.*}-$(date '+%F-%H%M%S').mkv"
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}
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for i in "$@"; do
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## Argument is a folder. We search for all video files in there.
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if [ -d "$i" ]; then
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## TODO: provide max-depth as option.
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while read -r j; do
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_tc_transcode $j
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done <<EOF
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$(find "$i" \( \
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-iname '*.mkv' -o \
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-iname '*.mp4' -o \
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-iname '*.avi' -o \
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-iname '*.webm' -o \
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-iname '*.flv' -o \
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-iname '*.wmv' -o \
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-iname '*.mpg' \) )
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EOF
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else
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## Argument is a regular file.
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_tc_transcode "$i"
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fi
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done
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## Restore Zsh previous options. This will not turn off shwordsplit if it
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## was on before calling the function.
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[ "$STATUS" = "off" ] && set +o shwordsplit
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