Convert images to video slideshow

convert.sh

#!/bin/bash
AWS_BUCKET="none"

FPS=30 # = 1/sec

###
# Set constants
###
RAW_FRAMES_FOLDER=input
IMAGES=($RAW_FRAMES_FOLDER/*) #store images in 0-index array

INTERMEDIATE_FRAMES_FOLDER=frames

VIDEO_OUTPUT_FOLDER=out
VIDEO_OUTPUT_FILE=video.mp4

###
# Initialization
###

mkdir -p $RAW_FRAMES_FOLDER $INTERMEDIATE_FRAMES_FOLDER $VIDEO_OUTPUT_FOLDER
#aws s3 sync s3://$AWS_BUCKET $RAW_FRAMES_FOLDER #import frames from S3

###
# Convert frames
###

for i in "${!IMAGES[@]}"; do
    SRC=${IMAGES[$i]}
    DEST=$(printf "%s/%03d.jpg" $INTERMEDIATE_FRAMES_FOLDER $((i+1)))

    #Pad and center
	ffmpeg 	-i $SRC \
			-vf "pad=max(iw\,ih):ow:(ow-iw)/2:(oh-ih)/2" \
			$DEST
done

#Can't figure out how to make the final input frame last more than a single output frame
#so for now it's just duplicated
FRAME_COPY=$(printf "%s/%03d.jpg" $INTERMEDIATE_FRAMES_FOLDER $((i+2)))
cp $DEST $FRAME_COPY

###
# Encode video
###

ffmpeg \
	-r 1 \
	-i "$INTERMEDIATE_FRAMES_FOLDER/%03d.jpg" \
	-vf "fps=$FPS,scale=500:500,format=yuv420p" \
	-codec:v libx264 \
	"$VIDEO_OUTPUT_FOLDER/$VIDEO_OUTPUT_FILE"

###
# Clean up
###

rm -rf $INTERMEDIATE_FRAMES_FOLDER/* #$RAW_FRAMES_FOLDER/*

Docs.md

Folder structure

|-/input #Still images
|-/frames #Converted and resized frames
|-/output
  |- video.mp4