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#!/bin/bash |
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#Quick and dirty way to get a video ready for byte or instagram or other |
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#These are usually in a ratio of 9:16, as opposed to usual viewing of 16:9 |
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#Requires: ffprobe, ffmpeg |
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#Example usages: |
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# 1) |
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# sh prepareVideoForSocialMedia.sh someStream.mp4 00:01:45 6 510 |
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# 2) |
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# sh prepareVideoForSocialMedia.sh someStream.mp4 02:17:00 6 |
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#This is just a helper function for ease of use |
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function convert_seconds_to_hms () { |
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num=$1 |
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min=0 |
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hour=0 |
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sec=0 |
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if((num>59));then |
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((sec=num%60)) |
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((num=num/60)) |
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if((num>59));then |
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((min=num%60)) |
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((num=num/60)) |
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((hour=num)) |
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else |
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((min=num)) |
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fi |
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else |
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((sec=num)) |
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fi |
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#pad zeroes |
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if [[ $hour -lt 10 ]] |
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then |
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hour="0$hour" |
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fi |
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if [[ $min -lt 10 ]] |
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then |
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min="0$min" |
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fi |
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if [[ $sec -lt 10 ]] |
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then |
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sec="0$sec" |
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fi |
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echo "$hour:$min:$sec" |
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} |
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ORIG=$1 #the file you want to extract from |
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START_TIME=$2 #where you want the start. In the format HH:mm:ss |
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LENGTH=$3 #how many seconds it should be (byte is 6, instagram is 30. I think) |
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X_CROP=$4 #the x coordinate you want at the centre of the video (i.e. what you want viewers to see) |
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# If X_CROP is left blank, the video will simply get rotated and scaled to fit |
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LENGTH="$(convert_seconds_to_hms 5)" |
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echo $LENGTH |
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if [ -z $X_CROP] |
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then |
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#Extract segment, rotate, and scale |
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echo "No X-Coordinate provided, rotating and scaling instead of cropping" |
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ffmpeg -i $ORIG -ss $START_TIME -t $LENGTH -filter:v "transpose=0, scale=-1:1080" -c:a copy ${ORIG%.*}-prepared.mp4 |
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else |
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#Extract segment, crop, and scale |
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DIMS=`ffprobe -v error -select_streams v:0 -show_entries stream=width,height -of csv=s=x:p=0 $ORIG` |
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x=${DIMS%x*} |
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y=${DIMS##*x} |
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width=`echo "scale=5;$y / (16 / 9)" | bc` |
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width=`echo $width|cut -f1 -d"."` |
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height=$y |
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echo $width |
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echo $height |
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#This does sort of assume your source video uses a happy audio codec |
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ffmpeg -i $ORIG -ss $START_TIME -t $LENGTH -filter:v "crop=$width:$height:$X_CROP:0, scale=-1:1080" -c:a copy ${ORIG%.*}-prepared.mp4 |
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fi |
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#Explanation of what this script does: |
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# |
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# This script takes a slice of your video, denoted by * |
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# Making it nice for viewing on mobile |
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# | _ _ _ _ _ _ _ _ _ *** _ _ _ _ _ | |
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# | *** | |
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# | *** | |
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# | *** | |
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# | *** | |
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# | *** | |
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# | *** | |
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# | _ _ _ _ _ _ _ _ _ *** _ _ _ _ _ | |
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# |
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# Of course, you can just use the rotate option if you want |
