172 lines
4.6 KiB
Bash
172 lines
4.6 KiB
Bash
#!/bin/sh
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usage () {
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cat <<EOF>&2
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Usage: ${0##*/} MODE
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This script was generated with tc-video-custom.
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It transcodes the embedded list of files using FFmpeg. MODE will specify what
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kind of output you want. Edit this file to fit your needs and learn more about
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FFmpeg.
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Modes:
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-f: Full video.
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-s: Sample of 5 minute starting at 1 minute.
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-S N: Sample of N minutes starting at 1 minute.
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EOF
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}
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SAMPLE=""
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OPT_PROCESS=false
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while getopts ":hfsS:" opt; do
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case $opt in
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h)
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usage
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exit ;;
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f)
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OPT_PROCESS=true ;;
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s)
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SAMPLE="-ss 60 -t 300"
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OPT_PROCESS=true ;;
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S)
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SAMPLE="-ss 60 -t $((60*$OPTARG))"
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OPT_PROCESS=true ;;
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\?)
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usage
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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 ! $OPT_PROCESS; then
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usage
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exit
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fi
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if ! command -v ffmpeg >/dev/null 2>&1; then
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echo >&2 "'ffmpeg' not found"
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exit 1
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fi
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transcode () {
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## You can choose here to process all files at the same time. Useful if you
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## need to remux streams or to concatenate.
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# ffmpeg -i ###FILELIST \
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ffmpeg -nostdin $SAMPLE -i "$@" \
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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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-dn \
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-map 0 \
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"${1%.*}-$(date '+%F-%H%M%S').mkv"
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}
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set -- ###FILENAMES
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## Choose to process all files one after another.
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for i ; do
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transcode "$i"
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done
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## Or all files at the same time. You have to change the ffmpeg input in the
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## function.
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# transcode
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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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## Insert stream 3 from file2 between all non-audio streams and audio streams of
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## file1:
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## -i "file1" -i "file2" -map -0:a map 1:3 -map 0:a
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##
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## Concatenate files. See <https://trac.ffmpeg.org/wiki/Concatenate> for more
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## details.
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##
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## -f concat -i list.txt -c copy out.ext
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##
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## with `cat list.txt`:
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## file 'file1'
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## file 'file2'
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##
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## With different codecs:
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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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