Image resize lambda function using ffmpeg command

Using the ffmpeg command, we can resize the images using the specified pixels. Below are the lambda functions used to convert images using the lambda function.

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import os

import subprocess

import shlex

import boto3

import json

import urllib.parse

from time import sleep

S3_DESTINATION_BUCKET = "s3-bucket-name"

SIGNED_URL_TIMEOUT = 600

def lambda_handler(event, context):

os.chdir('/tmp')

s3_source_bucket = event['Records'][0]['s3']['bucket']['name']

s3_source_key = urllib.parse.unquote_plus(event['Records'][0]['s3']['object']['key'], encoding='utf-8')

s3_source_basename = os.path.splitext(os.path.basename(s3_source_key))[0]

s3_source_key_new = os.path.basename(s3_source_key)

s3_destination_filename_xlarge = "xlarge"+s3_source_key_new

s3_destination_filename_large = "large"+s3_source_key_new

s3_destination_filename_medium = "medium"+s3_source_key_new

s3_destination_filename_small = "small"+s3_source_key_new

s3_client = boto3.client('s3')

s3_source_signed_url = s3_client.generate_presigned_url('get_object',

Params={'Bucket': s3_source_bucket, 'Key': s3_source_key},

ExpiresIn=SIGNED_URL_TIMEOUT)

s3_client.download_file(s3_source_bucket,s3_source_key,s3_source_key_new)

ffmpeg_cmd = f"/opt/bin/ffmpeg -i {s3_source_key_new} -vf scale=680:382 {s3_destination_filename_xlarge} "

os.system(ffmpeg_cmd)

resp = s3_client.put_object(Body=open(s3_destination_filename_xlarge,"rb"), Bucket=S3_DESTINATION_BUCKET, Key="converted/xlarge/"+s3_source_key_new)

ffmpeg_cmd = f"/opt/bin/ffmpeg -i {s3_source_key_new} -vf scale=540:304 {s3_destination_filename_large} "

os.system(ffmpeg_cmd)

resp = s3_client.put_object(Body=open(s3_destination_filename_large,"rb"), Bucket=S3_DESTINATION_BUCKET, Key="converted/large/"+s3_source_key_new)

ffmpeg_cmd = f"/opt/bin/ffmpeg -i {s3_source_key_new} -vf scale=440:248 {s3_destination_filename_medium} "

os.system(ffmpeg_cmd)

resp = s3_client.put_object(Body=open(s3_destination_filename_medium,"rb"), Bucket=S3_DESTINATION_BUCKET, Key="converted/medium/"+s3_source_key_new)

ffmpeg_cmd = f"/opt/bin/ffmpeg -i {s3_source_key_new} -vf scale=240:135 {s3_destination_filename_small} "

os.system(ffmpeg_cmd)

resp = s3_client.put_object(Body=open(s3_destination_filename_small,"rb"), Bucket=S3_DESTINATION_BUCKET, Key="converted/small/"+s3_source_key_new)

s3 = boto3.resource('s3')

return {

'statusCode': 200,

'body': json.dumps('Processing complete successfully')

}

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