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• ffmpeg file conversion AWS Lamda

  10 avril 2021, par eartoolbox

  I want a .webm file to be converted to a .wav file after it hits my S3 bucket. I followed this tutorial and tried to adapt it from my use case using the .webm -> .wav ffmpeg command described here.

  


  My AWS Lambda function generally works, in that when my .webm file hits the source bucket, it is converted to .wav and ends up in the destination bucket. However, the resulting file .wav is always 0 bytes (though the .webm not, including the appropriate audio). Did I adapt the code wrong ? I only changed the ffmpeg_cmd line from the first link.

  


  import json
import os
import subprocess
import shlex
import boto3

S3_DESTINATION_BUCKET = "hmtm-out"
SIGNED_URL_TIMEOUT = 60

def lambda_handler(event, context):

    s3_source_bucket = event['Records'][0]['s3']['bucket']['name']
    s3_source_key = event['Records'][0]['s3']['object']['key']

    s3_source_basename = os.path.splitext(os.path.basename(s3_source_key))[0]
    s3_destination_filename = s3_source_basename + ".wav"

    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)
    
    ffmpeg_cmd = "/opt/bin/ffmpeg -i \"" + s3_source_signed_url + "\" -c:a pcm_f32le " + s3_destination_filename + " -"
    
    
    command1 = shlex.split(ffmpeg_cmd)
    p1 = subprocess.run(command1, stdout=subprocess.PIPE, stderr=subprocess.PIPE)

    resp = s3_client.put_object(Body=p1.stdout, Bucket=S3_DESTINATION_BUCKET, Key=s3_destination_filename)

    return {
        'statusCode': 200,
        'body': json.dumps('Processing complete successfully')
    }
 


  


• check if file is downloaded in temp in GCF from GCS

  3 septembre 2020, par soshi

  Im making video encoder using GCF

  


  that downloads video file from gcs to /tmp and encode it by ffmpeg.

  


  I want to ask how to check if file is downloaded in tmp ?

  


  I tried console.log(process.cwd()) but tmp folder is not displayed

  


  exports.encodeVideo = async (req, res) => {

 mkdirp('/tmp')

 storage.bucket('video-bucket').file('raw/samplevideo.mp4').download({ 
 destination:'encoded/samplevideo.mp4' })

ffmpeg........
}


  


• FFMPEG Split Side by Side video in two

  10 février 2021, par youngz

  I have .m2ts video which include a 3d video, with, as consequence, the left and right components. Is there a smart way to split the video in two stimulus (with for example ffmpeg) ?

  


  The actual solution is to convert the video in mp4 and then crop it in two. However, I suppose that it is not the smarter solution.

  


  Thanks