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| -rwxr-xr-x | two-pass.sh | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/two-pass.sh b/two-pass.sh new file mode 100755 index 0000000..e9e3e15 --- /dev/null +++ b/two-pass.sh @@ -0,0 +1,59 @@ +#!/usr/bin/env bash +set -x +INPUT=$1 # input file +OUTPUT=$2 # target file +SIZE=$3 # [0-9]+[GgMmKk] +TEMP=$(mktemp) +DURATION=$(mediainfo --Inform="Video;%Duration%" $INPUT) +durS=$(($DURATION/1000)) +if [[ "$SIZE" =~ [0-9]+[Gg] ]]; then + gb=${SIZE/[Gg]/} + kb=$(($gb * 8 * 1024 * 1024)) +fi +if [[ "$SIZE" =~ [0-9]+[Mm] ]]; then + mb=${SIZE/[Mm]/} + kb=$(($mb * 8 * 1024)) # doing 1M = 1000K just to build in some overhead +fi +if [[ "$SIZE" =~ [0-9]+[Kk] ]]; then + k=${SIZE/[Kk]/} + kb=$((k * 8)) + +fi +if [ ! $kb ]; then + echo "unable to calculate bitrate" + exit +fi +audiosize=$((160*durS)) +target=$(($kb-$audiosize)) +bitrate=$(($target/$durS)) + + +ffmpeg -i $1 \ + -y \ + -f mp4 \ + -g 15 \ + -movflags +faststart \ + -preset ultrafast \ + -threads 9 \ + -c:v libx264 \ + -b:v ${bitrate}k \ + -pass 1 \ + -an \ + -passlogfile $TEMP \ + /dev/null + +ffmpeg -i $1 \ + -y \ + -b:a 160k \ + -c:a aac \ + -ac 2 \ + -f mp4 \ + -g 15 \ + -movflags +faststart \ + -preset ultrafast \ + -threads 9 \ + -c:v libx264 \ + -b:v ${bitrate}k \ + -pass 2 \ + -passlogfile $TEMP \ + $2 |