tc-video-generic: dynamic audio bitrate (WIP)
Pierre Neidhardt
parent
c3852172fb
commit
e089b4d41d
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@ -1,7 +1,5 @@
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#!/bin/sh
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## TODO: audio quality. Copy if AAC or OGG <320k.
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## mediainfo out.mkv | awk '/^Audio/{while(getline && ! index($0,"Bit rate ")); print $4}'
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## TODO: handle srt encoding.
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if [ -z "$(command -v ffmpeg)" ]; then
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@ -44,15 +42,15 @@ EOF
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SAMPLE=""
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# USER_OPT="" ## Can use environment value.
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VIDEO_FILTER=""
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VIDEO_CODEC="-vn"
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# VIDEO_CODEC="-c:v libx264 -preset slow -crf 20"
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VIDEO_CODEC="-c:v libx264 -preset slow -crf 20"
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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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# AUDIO_CODEC="-c:a libvorbis -b:a 192k -ac 2"
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AUDIO_CODEC="-c:a libvorbis -ac 2"
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## description which is not available in these formats.
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AUDIO_FILTER="-ac 2"
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AUDIO_CODEC="libvorbis"
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AUDIO_DEFAULT_RATE="192"
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## What to do if file exists:
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# -y overwrite
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@ -110,7 +108,7 @@ STATUS="$(set -o | grep 'shwordsplit' | awk '{print $2}')"
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_duration()
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{
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## In seconds.
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ffmpeg -i "$1" 2>&1 | awk '/Duration/ {split($2, time, /:|\./); print time[1]*60*60 + time[2]*60 + time[3]}'
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ffmpeg -i "$1" 2>&1 </dev/null | awk '/Duration/ {split($2, time, /:|\./); print time[1]*60*60 + time[2]*60 + time[3]}'
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}
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_highfreq()
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@ -124,47 +122,93 @@ _cropvalue()
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## sample the crop values. We keep the values with highest frequency.
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STEP=$(($(_duration "$1")/6))
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for i in $(seq $STEP $STEP $((5*$STEP))); do
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ffmpeg -ss $i -t 10 -i "$1" -vf "cropdetect=24:2:0" -f null - 2>&1
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ffmpeg -ss $i -t 10 -i "$1" -vf "cropdetect=24:2:0" -f null - 2>&1 </dev/null
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done | _highfreq
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}
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_audiobitrate()
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{
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## As of 2013-10-23, ffmpeg sucks at retrieving audio bitrate. Therefore we
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## use mediainfo if available, ffmpeg otherwise.
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## In the end, if some stream bitrates are missing, we have two
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## possibilities: either we copy the stream, or we encore it to a default
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## value.
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## Case1: copy streams
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if [ ! -n "$(command -v mediainfo)" ]; then
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mediainfo "$1" | awk -v codec="$AUDIO_CODEC" 'BEGIN {id=0} /^Audio/ { getline; while(getline && ! index($0,"Bit rate ")); if($4) printf "-c:a:" id " " codec " -b:a:" id " " $4 "k " ; else printf "-c:a:" id " copy "; id++} END {print ""}'
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else
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ffmpeg -i "$1" 2>&1 </dev/null | awk -v codec="$AUDIO_CODEC" 'BEGIN {id=0} /^ *Stream.*Audio/ {match($0, / [^ ]+ kb\/s/); res=substr($0, RSTART+1, RLENGTH-6); if(res) printf "-c:a:" id " " codec " -b:a:" id " " res "k " ; else printf "-c:a:" id " copy "; id++} END {print ""}'
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fi
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## Case2: encode to default
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if [ ! -n "$(command -v mediainfo)" ]; then
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mediainfo "$1" | awk -v codec="$AUDIO_CODEC" -v bitrate="$AUDIO_DEFAULT_RATE" 'BEGIN {id=0} /^Audio/ { getline; while(getline && ! index($0,"Bit rate ")); if($4) printf "-c:a:" id " " codec " -b:a:" id " " $4 "k " ; else printf "-c:a:" id " copy "; id++} END {print ""}'
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else
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ffmpeg -i "$1" 2>&1 </dev/null | awk -v codec="$AUDIO_CODEC" -v bitrate="$AUDIO_DEFAULT_RATE" 'BEGIN {id=0} /^ *Stream.*Audio/ {match($0, / [^ ]+ kb\/s/); res=substr($0, RSTART+1, RLENGTH-6); if(res) printf "-c:a:" id " " codec " -b:a:" id " " res "k " ; else printf "-c:a:" id " " codec " -b:a:" id " " bitrate "k "; id++} END {print ""}'
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fi
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## TODO: audio quality. Copy if AAC or OGG <320k.
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# if [ -n "$(command -v mediainfo)" ]; then
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# mediainfo "$1" | awk '/^Audio/ {while(getline && ! index($0,"Bit rate ")); if($4) print $4 ;else print 0}'
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# else
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# ffmpeg -i "$1" 2>&1 </dev/null | awk '/^ *Stream.*Audio/{match($0, / [^ ]+ kb\/s/); res=substr($0, RSTART+1, RLENGTH-6); if (res) print res; else print 0}'
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# fi
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# AUDIO_BITRATE="-b:a 192k"
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}
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_tc_transcode()
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{
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cat<<EOF
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================================================================================
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File: $1
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User options: ${USER_OPT:-None}
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Sample: ${SAMPLE:-No}
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Clear 'Title': $OPT_REMOVE_TITLE
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Crop: $OPT_CROP
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================================================================================
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EOF
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echo "==> [$1]"
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STREAM_TITLE=""
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if $OPT_REMOVE_TITLE; then
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STREAM_NUM=$(ffmpeg -i "$1" 2>&1 | grep -c 'Stream')
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STREAM_NUM=$(ffmpeg -i "$1" 2>&1 </dev/null| 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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if $OPT_CROP; then
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echo -n "Computing crop values... "
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echo "Computing crop values... "
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VIDEO_FILTER="-vf $(_cropvalue "$1")"
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echo "$VIDEO_FILTER"
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# return
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fi
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AUDIO_BITRATE="-b:a 192k"
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AUDIO_BITRATE="$(_audiobitrate "$1")"
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cat<<EOF
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================================================================================
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User options: ${USER_OPT:-None}
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Sample: ${SAMPLE:-No}
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Clear 'Title': $OPT_REMOVE_TITLE
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Crop: $OPT_CROP
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Video filter: $VIDEO_FILTER
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Audio bitrate: $AUDIO_BITRATE
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Audio filter: $AUDIO_FILTER
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================================================================================
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EOF
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exit
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OUTPUT="${1%.*}-$(date '+%F-%H%M%S').mkv"
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ffmpeg $OVERWRITE -i "$1" \
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$VIDEO_CODEC $VIDEO_FILTER \
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$AUDIO_CODEC $AUDIO_BITRATE \
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$AUDIO_CODEC $AUDIO_BITRATE $AUDIO_FILTER \
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-c:s copy \
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-map 0 $STREAM_TITLE \
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$SAMPLE $USER_OPT "$OUTPUT"
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$SAMPLE $USER_OPT "$OUTPUT" </dev/null
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if $OPT_OVERWRITE; then
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rm -f "$1"
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@ -178,27 +222,21 @@ for i in "$@"; do
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## Argument is a folder. We search for all video files in there.
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if [ -d "$i" ]; then
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## WARNING: ffmpeg should not be called from within a while<<EOF loop
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## since it continues to read input while running. However IFS needs to
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## be restored for wordsplitting to work correctly.
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OLDIFS="$IFS"
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IFS="
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"
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## WARNING: ffmpeg continues to read stdin once it has started, so it should
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## not be called from within a while<<EOF loop without redirecting stdin.
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for j in $(find "$i" \( \
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while IFS= read -r i; do
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_tc_transcode "$j"
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done<<EOF
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$(find "$i" \( \
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-iname '*.mkv' -o \
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-iname '*.mp4' -o \
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-iname '*.avi' -o \
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-iname '*.webm' -o \
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-iname '*.flv' -o \
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-iname '*.wmv' -o \
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-iname '*.mpg' \) ); do
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IFS="$OLDIFS"
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_tc_transcode "$j"
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IFS="
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"
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done
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IFS=$OLDIFS
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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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