There isn't a lot of documentation, except the script itself. Please get the version from the link above, but for indexing purposes, I'll include a potentially slightly out of date version here:
#!/bin/bash
# vidcomp -h -time "-dvd-device . -alang English" dvd://1 /var/local/space/vid/10com8.avi
# http://gentoo-wiki.com/HOWTO_Mencoder_Introduction_Guide
# http://electron.mit.edu/~gsteele/ffmpeg
# http://www.mplayerhq.hu/DOCS/HTML/en/menc-feat-enc-libavcodec.html
# http://web.njit.edu/all_topics/Prog_Lang_Docs/html/mplayer/encoding.html
# http://www.linux.com/article.pl?sid=06/08/22/2121258
# transcode -f 15 -w 800,250,100 -y divx5,lame -N 0x55 -o test.avi -i $1
# enable PAL on PVR350 mpeg2 encoder
#v4l2-ctl --set-input 2
#v4l2-ctl -s 2
#v4l2-ctl --set-ctrl=video_peak_bitrate=8000000
#v4l2-ctl --set-ctrl=video_bitrate=6000000
# dumpstream stream# file.tivo
dumpstream () {
mplayer tivo://tivo/$1 -demuxer 33 -dumpstream -dumpfile "$2"
}
die () {
echo "${1:-}"
exit 1
}
# vidcomp -br 10000 -time "-edl cuts" rec_0012.mov
#mplayer -vf cropdetect enquete.vob
#vidcomp -h -vf crop=336:320:12:126 enquete.vob
# Aspect ratio has to be forced with codecs other than xvid
#vf='-vf scale=480:370'
# vidcomp -vf "-filter:v fps=29" $i
vf=""
af=""
#codec=h264
#codec=h265
#br=3000
# AV1 is supposed to be better tan VP9, but on my short tests,
# VP9 was faster and gave smaller files.
codec=vp9
br=2000
abr=128
rot=""
ffrot=""
aud_channels=""
aud_srate=""
time="" # -ss 10 -endpos 1:54:00 (mencoder)
# -time "-ss 0:3:40 -t 3:20" (ffmpeg)
# or -time "-ss 0:3:40 -t 3:20" -vf "mp=eq2=0.9:1:-0.1" (ffmpeg)
# vidcomp -br 8000 -time "-ss 04:00 -t 0:29:20" -vf "mp=eq2=0.9:1:-0.1" full.avi
# Crop the right side crop=1540:1080:0:0
if [ $0 = *tivo* ]]; then
echo "Tivo Mode"
# tivo files are sometimes mis-detected: force the right demuxer
demux="-demuxer 33"
# Aspect ratio has to be forced with codecs other than xvid
aspect='-force-avi-aspect 1.333'
# and remove crap we don't want (tivo inserts a line of crap at the top)
vf="-vf crop=352:476,kerndeint"
elif [ $0 = *pal* ]]; then
# Couldn't quite get this to work yet, crop overrides it :(
#vf='-vf scale=540:405,crop=512:384,kerndeint'
vf='-vf scale=768:576,kerndeint'
# problem with divx is that pass2 can fail with br too low errors
codec=h264
br=800
# elif [ $0 = *camvidrecomp ]]; then
# codec=ffmpeg
# br=8000
# abr=128
# old cameras
# abr=48
# br=2400
# aud_channels="-channels 1"
# aud_srate="-srate 22050"
fi
# Hack for MTS
demux="-mc 100"
#demux="-demuxer lavf"
#aspect='-force-avi-aspect 1.777'
while [ ! -z "$1" ] && [ "$1" =~ ^-.* ]]
do
if [ "$1" = "-w" ]; then
shift
codec=win
vf="-forceidx -vf kerndeint"
fi
if [ "$1" = "-d" ]; then
shift
codec=divx
#vf="-forceidx -vf kerndeint"
fi
if [ "$1" = "-D" ]; then
shift
codec=divx1
vf="-forceidx -vf kerndeint"
fi
if [ "$1" = "-F" ]; then
shift
codec=flv
br=400
abr=56
aud_srate="-srate 22050"
vf='-vf scale=512:384'
fi
if [ "$1" = "-h" -o "$1" = "-h4" ]; then
shift
codec=h264
vf="-forceidx -vf kerndeint"
fi
if [ "$1" = "-h4ff" ]; then
shift
codec=ffmpeg4
fi
if [ "$1" = "-h5" ]; then
shift
codec=h265
fi
if [ "$1" = "-vp9" ]; then
shift
codec=vp9
fi
if [ "$1" = "-av1" ]; then
shift
codec=av1
fi
if [ "$1" = "-x" ]; then
shift
codec=xvid
vf="-forceidx -vf kerndeint"
fi
if [ "$1" = "-ff" ]; then
shift
codec=ffmpeg
fi
# https://trac.ffmpeg.org/wiki/Encode/H.264
# says not compatible with most players
if [ "$1" = "-ffll" ]; then
shift
codec=ffmpegll
fi
if [ "$1" = "-vol" ]; then
shift
vol=":vol=$1"
shift
fi
# try instead of rotate
if [ "$1" = "-f" ]; then
shift
rot="-vf flip,mirror"
#ffrot="-vf hflip,vflip"
# https://www.baeldung.com/linux/ffmpeg-rotate-video#:~:text=transpose%20is%20an%20FFmpeg%20filter,the%20values%20from%200%2D3.
ffrot="-vf hflip,vflip"
ffrot="-vf transpose=1,transpose=3"
fi
if [ "$1" = "-r" ]; then
#rot="-vf mirror,rotate=$2"
# works with -r 3
rot="-vf rotate=$2"
ffrot="-vf transpose=$2"
shift 2
fi
if [ "$1" = "-br" ]; then
br="$2"
shift 2
fi
# -ss 10 -endpos 1:54:00
# -ss 00:01:00 -to 00:02:00
if [ "$1" = -time ]; then
time="$2"
shift 2
fi
# for instance -vf scale=540:405,crop=512:384
if [ "$1" = -vf ]; then
vf="$2"
shift 2
fi
done
test $# -eq 1 || test $# -eq 2 || die "$0 file_src file_dest (please read script for options)"
test $# -eq 2 && test -f "$2" && die "file_dest should not exist"
src="$1"
dest="${2:-$src.new}"
#set -vx
if [ "$codec" = win ]; then
ionice -c3 nice -19 mencoder $demux $aud_channels $aud_srate -oac mp3lame -lameopts mode=3:abr:br=$abr$vol $time $aspect $vf -ovc lavc -lavcopts vcodec=msmpeg4v2:vhq:vbitrate=$br $rot -o "$dest" "$src"
elif [ "$codec" = divx1 ]; then
ionice -c3 nice -19 mencoder $demux $aud_channels $aud_srate -oac mp3lame -lameopts mode=3:abr:br=$abr$vol $time $aspect $vf -ovc lavc -lavcopts vcodec=mpeg4:vhq:trell=yes:v4mv=yes:vbitrate=$br -ffourcc DX50 $rot -o "$dest" "$src"
elif [ "$codec" = flv ]; then
# http://www.jeremychapman.info/cms/mencoder-avi-to-flv-conversion
ionice -c3 nice -19 mencoder $demux $aud_channels $aud_srate -oac mp3lame -lameopts mode=3:abr:br=$abr$vol $time $aspect $vf -ovc lavc -lavcopts vcodec=flv:vbitrate=$br:mbd=2:mv0:trell:v4mv:cbp:last_pred=3 -of lavf $rot -o "$dest" "$src"
elif [ "$codec" = xvid ]; then
ionice -c3 nice -19 mencoder $demux $aud_channels $aud_srate -oac mp3lame -lameopts mode=3:abr:br=$abr$vol $time $aspect $vf -ovc xvid -xvidencopts bitrate=$br $rot -o "$dest" "$src"
elif [ "$codec" = ffmpeg4 ]; then
# aspect/-force-avi-aspect not supported by ffmpeg
#ionice -c3 nice -19 ffmpeg $time -analyzeduration 9999999 -probesize 9999999 -y -i "$src" $vf -c:v libx264 -preset medium -b:v ${br}k -pass 1 -c:a libfdk_aac -b:a 128k -f mp4 /dev/null
#ionice -c3 nice -19 ffmpeg $time -analyzeduration 9999999 -probesize 9999999 -i "$src" $vf -c:v libx264 -preset medium -b:v ${br}k -pass 2 -c:a libfdk_aac -b:a 128k -f mp4 "$dest"
ionice -c3 nice -19 ffmpeg $time -analyzeduration 9999999 -probesize 9999999 -y -i "$src" -filter:v fps=30 $vf -c:v libx264 -preset medium -b:v ${br}k -pass 1 -an -f mp4 /dev/null
ionice -c3 nice -19 ffmpeg $time -analyzeduration 9999999 -probesize 9999999 -i "$src" -filter:v fps=30 $vf -c:v libx264 -preset medium -b:v ${br}k -pass 2 -c:a aac -b:a 128k -f mp4 "$dest"
### H265 in MP4 => slow and royalties
elif [ "$codec" = h265 ]; then
# https://trac.ffmpeg.org/wiki/Encode/H.265
ionice -c3 nice -19 ffmpeg $time -y -i "$src" $vf $ffrot -filter:v fps=30 -c:v libx265 -b:v ${br}k -x265-params pass=1 -an -f mp4 /dev/null
ionice -c3 nice -19 ffmpeg $time -i "$src" $vf $ffrot -filter:v fps=30 -c:v libx265 -b:v ${br}k -x265-params pass=2 -c:a aac -b:a 128k -f mp4 "$dest"
# https://trac.ffmpeg.org/wiki/Encode/AV1
#
# vp9 vs av1 comparison and flags:
# https://jonathanmh.com/p/encoding-webm-videos-with-ffmpeg-vp9-av1
# Gemini says: Compression Efficiency
# * AV1: Offers the best compression efficiency, resulting in smaller file sizes for a given quality level
# * H.265: Provides significant improvements over H.264, offering better compression than VP9 in many cases
# * VP9: While not as efficient as H.265 or AV1, it still offers decent compression and is widely supported.
# Encoding and Decoding Speed:
# * AV1: Requires more computational power for encoding and decoding, which can impact performance on older hardware
# * H.265: Offers a good balance between compression efficiency and encoding/decoding speed.
# * VP9: Generally faster to encode and decode compared to AV1.
### VP9 is free version of H265
# https://caniuse.com/?search=vp9
# cpu used lower values are slower but better quality -row-mt 1 added HT. Speed is faster than AV1 but compression seems still good
# 2453715 file1.mp4
# 1555963 file1_av1_4.webm
# 1611192 file1_av1_6.webm
# 1611192 file1_av1_8.webm
# 1668740 file1_vp9_4.webm
# 1598794 file1_vp9_6.webm
# 1595698 file1_vp9_8.webm
elif [ "$codec" = vp9 ]; then
ionice -c3 nice -19 ffmpeg $time -y -i "$src" $vf $ffrot -filter:v fps=30 -c:v libvpx-vp9 -b:v ${br}k -cpu-used 6 -row-mt 1 -pass 1 -an -f null /dev/null
ionice -c3 nice -19 ffmpeg $time -i "$src" $vf $ffrot -filter:v fps=30 -c:v libvpx-vp9 -b:v ${br}k -cpu-used 6 -row-mt 1 -pass 2 -c:a libopus -b:a 128k "$src.webm"
### AV1 a better version of VP9
# https://caniuse.com/?search=av1
# https://trac.ffmpeg.org/wiki/Encode/AV1
# cpu used lower values are slower but better quality -row-mt 1 added HT
elif [ "$codec" = av1 ]; then
ionice -c3 nice -19 ffmpeg $time -y -i "$src" $vf $ffrot -filter:v fps=30 -c:v libaom-av1 -b:v ${br}k -cpu-used 8 -row-mt 1 -pass 1 -an -f null /dev/null
ionice -c3 nice -19 ffmpeg $time -i "$src" $vf $ffrot -filter:v fps=30 -c:v libaom-av1 -b:v ${br}k -cpu-used 8 -row-mt 1 -pass 2 -c:a libopus -b:a 128k "$src.webm"
# old legacy mencoder stuff (mencoder h264 or divx)
else
pass="$dest".pass
for i in 1 2
do
echo "DOING $codec PASS $i"
echo "------------------"
if [ "$codec" = h264 ]; then
#vf=$vf,dsize=4/3,scale
#vf=$vf,scale=720:480
vf=$vf,scale # why is scale there by itself?
# Trellis searched quantization
# do not allow space in source, to allow a multi file source
ionice -c3 nice -19 mencoder -passlogfile "$pass" $demux $aud_channels $aud_srate -oac mp3lame -lameopts mode=3:abr:br=$abr$vol $time $aspect -vf $vf -ovc x264 -x264encopts bitrate=$br:turbo=1:pass=1:threads=0 $rot -o "$dest" $src || die "multipass failed on pass $i"
elif [ "$codec" = divx ]; then
# Trellis searched quantization
ionice -c3 nice -19 mencoder -passlogfile "$pass" $demux $aud_channels $aud_srate -oac mp3lame -lameopts mode=3:abr:br=$abr$vol $time $aspect $vf -ovc lavc -lavcopts vcodec=mpeg4:vhq:trell=yes:v4mv=yes:vbitrate=$br:vpass=$i -ffourcc DX50 $rot -o "$dest" "$src" || die "multipass failed on pass $i"
fi
done
/bin/rm "$pass" *.pass.mbtree &>/dev/null
#else
# echo "Unknown $codec" >&2
fi
#vidrename --noinfo "$dest"
/bin/rm ffmpeg2pass-0.log ffmpeg2pass-0.log.mbtree x265_2pass.log* &>/dev/null
