152 lines
4.6 KiB
Bash
152 lines
4.6 KiB
Bash
#!/bin/sh
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if [ -z "$(command -v ffmpeg)" ]; then
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echo "ffmpeg required."
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exit
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fi
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_transcode ()
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{
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## Zsh compatibility. We need it otherwise word splitting of parameter like
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## TC_SAMPLE will not work.
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STATUS="$(set -o | grep 'shwordsplit' | awk '{print $2}')"
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[ "$STATUS" = "off" ] && set -o shwordsplit
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ffmpeg -i "$@" \
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-c:v libx264 -preset slow -crf 20 \
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-c:a libvorbis -b:a 192k -ac 2 \
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-c:s copy \
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-map 0 \
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$TC_SAMPLE \
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"${1%.*}-$(date '+%F-%H%M%S').mkv"
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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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}
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_printhelp()
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{
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cat <<EOF
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Usage: ${1##*/} [-f] [FILES]
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Transcode FILES using custom FFmpeg command. By default FFmpeg will only encode
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a sample for preview purpose. Use the '-f' flag to process the complete file.
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Edit this file to fit your needs and learn more about FFmpeg.
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EOF
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}
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TC_SAMPLE="-ss 60 -t 360"
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while getopts ":hf" opt; do
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case $opt in
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h)
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_printhelp "$0"
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exit 1 ;;
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f)
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TC_SAMPLE="" ;;
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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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## Choose to process all files in one batch
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_transcode ###FILELIST
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## Or one after another.
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# while read -r i; do
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# _transcode "$i"
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# done<<FILELINES
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# FILELINES
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################################################################################
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## USE CASES
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##
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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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##
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## -map -0:1 -map -0:2 -map 0:2 -map 0:1
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##
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## Change audio stream 1 title and remove audio stream 2 title:
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##
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## -metadata:s:a:0 title="FR: OGG Stereo" -metadata:s:a:1 title=""
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##
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## Demux audio:
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## -vn -sn -c:a copy -map 0:1
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##
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## Dump audio to an ogg file:
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## -vn -c:a libvorbis -b:a 192k
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##
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## Add a delay to audio (assuming stream 0 is video and stream 1 is audio)
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## -i "$1" -itsoffset 0.300 -i "$1" -map 0:0 -map 1:1
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##
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## Concatenate files. See
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## https://trac.ffmpeg.org/wiki/How%20to%20concatenate%20(join,%20merge)%20media%20files
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## for more details
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##
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## -filter_complex '[0:0] [0:1] [1:0] [1:1] concat=n=2:v=1:a=1 [v] [a]' -map '[v]' -map '[a]'
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##
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################################################################################
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################################################################################
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## SOUND
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##
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## You should consider mixing down audio to 2 channels with '-ac
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## 2'. This greatly reduce file size and avoid any confusion for playback, which
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## is often the case when converting DTS to any other format because DTS has
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## embedded channel description which is not available in other formats.
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################################################################################
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################################################################################
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## X264 OPTIONS
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##
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## x264 presets (-preset <preset>).
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## preset ~= speed and quality*size ~= 1/speed
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## ultrafast, superfast, veryfast, faster, fast, medium, slow, slower, veryslow, placebo
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## Recommended values: faster -- slow
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## slow is approx. two times slower than fast, and reduces the size by approx. 10%.
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##
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## x264 overall quality (-crf) is a logarithmic scale.
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## 18 is near perfection.
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## 22 is really good compression, while a bit more blurry than the original.
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## 20 is a good compromise.
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##
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## x264 tuning (-tune <preset>).
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## Possible values: film, animation, grain, ...
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## See x264 --fullhelp.
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## No tuning by default.
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##
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## x264 options (-x264opts me=<value>).
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## Possible values: hex, umh...
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## me=umh is default.
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################################################################################
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################################################################################
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## FALLACIOUS INPUT
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##
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## In general, FFmpeg is not so good at copying fallacious streams. Reecoding
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## video and audio streams helps a lot.
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##
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## "Can't write packet with unknown timestamp"
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## Put '-fflags genpts' before the input command.
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################################################################################
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################################################################################
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## MISC
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## To check what fmmpeg supports:
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## $ ffmpeg -codecs
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## $ ffmpeg -formats
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##
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## Useful guides:
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## x264: http://ffmpeg.org/trac/ffmpeg/wiki/x264EncodingGuide
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## ID3 details: http://en.wikipedia.org/wiki/ID3
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################################################################################
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