tc-video-generic: dynamic audio bitrate almost done
Pierre Neidhardt
parent
5836eb3586
commit
bbfcc7633d
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@ -133,47 +133,23 @@ _audiobitrate()
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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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## possibilities: either we copy the stream (default), or we encode it to a
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## default 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($0, RSTART+1, RLENGTH-6); if(res) printf "-c:a:" id " " codec " -b:a:" id " " res "k " ; else printf "-c:a:" id " copy "; id++} END {print ""}'
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# fi
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## TODO: merge two cases, use default value when not 0, copy otherwise.
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## Case2: encode to default
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if [ ! -n "$(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 " " $4 "k " ; else printf "-c:a:" id " copy "; id++} END {print ""}'
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## AWK note: in "(bitrate+0 > 500)", the +0 is required to make sure bitrate is numeric.
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if [ -n "$(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 if (bitrate > 0) printf "-c:a:" id " " codec " -b:a:" id " " bitrate "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 if (bitrate > 0) printf "-c:a:" id " " codec " -b:a:" id " " bitrate "k "; else printf "-c:a:" id " copy "; id++} END {print ""}'
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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($0, RSTART+1, RLENGTH-6); if(res || bitrate) {if(res) bitrate=res; if(bitrate+0 > 500) bitrate=500; printf "-c:a:" id " " codec " -b:a:" id " " bitrate "k "} else printf "-c:a:" id " copy "; id++} END {print ""}'
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fi
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## TODO: audio quality. Copy if AAC or OGG <320k.
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# if [ -n "$(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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## TODO: use 2 awk calls.
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}
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_tc_transcode()
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{
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echo "==> [$1]"
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OUTPUT="${1%.*}-$(date '+%F-%H%M%S').mkv"
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STREAM_TITLE=""
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if $OPT_REMOVE_TITLE; then
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@ -189,15 +165,14 @@ _tc_transcode()
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fi
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## WARNING: we mix down audio to 2 channels with '-ac 2'. This greatly reduce
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## file size and avoid any confusion for playback, which is often the case when
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## converting DTS to any other format because DTS has embedded channel
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## description which is not available in these formats.
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# AUDIO_FILTER="-ac 2"
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## If AUDIO_FILTER is already set, it means that we copy.
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## Only set AUDIO_PARAM if not already set.
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if [ -z "$AUDIO_PARAM" ]; then
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AUDIO_PARAM="$(_audiobitrate "$1") -ac 2"
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## WARNING: we mix down audio to 2 channels with '-ac 2'. This greatly
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## reduce file size and avoid any confusion for playback, which is often
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## the case when converting DTS to any other format because DTS has
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## embedded channel description which is not available in these formats.
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# AUDIO_FILTER="-ac 2"
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AUDIO_PARAM="$(_audiobitrate "$1") -ac 2"
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fi
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cat<<EOF
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@ -215,9 +190,6 @@ EOF
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$OPT_PREVIEW && exit
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OUTPUT="${1%.*}-$(date '+%F-%H%M%S').mkv"
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## Zsh compatibility. We need it otherwise word splitting of parameter like
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## SAMPLE will not work.
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STATUS="$(set -o | grep 'shwordsplit' | awk '{print $2}')"
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@ -230,7 +202,6 @@ EOF
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-map 0 $STREAM_TITLE \
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$SAMPLE $TC_VIDEO_OPT "$OUTPUT" </dev/null
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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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[ "$STATUS" = "off" ] && set +o shwordsplit
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@ -249,7 +220,6 @@ for i in "$@"; do
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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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while IFS= read -r i; do
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_tc_transcode "$j"
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done<<EOF
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