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• Opening Video with opencv3 and python on Amazon EC2

  11 octobre 2016, par stml

  I successfully set up python and opencv3 on an t2.micro instance by following these instructions : http://stackoverflow.com/a/38867965/1213715

  The script which worked on my local machine no longer works. The problem seems to be with importing video. The start of my code now looks like this :

  import numpy as np
  
  import cv2
  
  
  
  cap = cv2.VideoCapture('/home/ec2-user/test.mov')
  
  
  
  if(cap.isOpened() == False):
  
      print "Can't open video"
  
      exit()

  This exits every time. I have tried different paths and different video formats (including .avi).

  In other threads, I read that ffmpeg is essential to cv2 video functions, and successfully installed this using the instructions at https://forums.aws.amazon.com/thread.jspa?messageID=524523. I can now run ffmpeg from the command line - but it has not changed the cv2 output.

  Do I need to link ffmpeg to cv2 somehow, or do I need to recompile entirely - and if so, what change should I make to the original installation instructions ?

  Python version 2.7.12

  Opencv version 3.1.0

• How to transcode .mp4 files using ffmpeg celery rabbitMq in Amazon Linux ?

  11 mars 2017, par Srinivas 25

  I want to transcode .mp4, .flv files by using ffmpeg, celery and rabbitMQ. With the help of these tools i can able to transcode in localhost, where in
  my OS is ubuntu, but i am unable to do the same on AWS Linux for production
  Here is the code i am using to integrate ffmpeg, rabbitMQ and celery to transcode on Amazon Linux

  FFMPEG_PATH = '/usr/bin/ffmpeg'
  
  
  
  
  
  CELERY_BROKER_URL = 'amqp://guest:guest@awsuser:5672//'
  
  CELERY_ACCEPT_CONTENT = 'file'
  
  CELERY_RESULT_BACKEND = 'rpc://'
  
  CELERY_TASK_SERIALIZER = 'file'

  celery.py

  from __future__ import absolute_import
  
  import os
  
  from celery import Celery
  
  from afnity.settings import CELERY_BROKER_URL
  
  
  
  os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'afnity.settings')
  
  
  
  
  
  app = Celery('taskapp',
  
           broker=CELERY_BROKER_URL,
  
           include=['taskapp.tasks'])
  
  
  
  app.config_from_object('django.conf:settings', namespace='CELERY')
  
  
  
  
  
  if __name__ == '__main__':
  
  app.start()

  tasks.py

  from .celery import app
  
  
  
  @app.task
  
  def add()
  
   return(3+4d)

• Php - Get video duration from a file hosted on amazon S3 server

  8 mai 2017, par Michael Lee

  I am developing back-end API with php to get the duration from a video file hosted on amazon S3. The API server is hosted on amazon EC2 and the video file is uploaded on amazon S3. The problem is when I request to API server, it has to response the information of the video file hosted on amazon S3 such as duration, file size, resolution etc. At least, it must response the video. I’ve followed codes by using ffmpeg such as below, but it’s not working.

  <?php
  
  $file = 'https://videoapptest-bucket.s3.amazonaws.com/video/10/44__55_f03876434e48d5fed7d6982b0cf578de_u_00000.ts';
  
  $result = shell_exec('ffmpeg -i ' . escapeshellcmd($file) . ' 2>&1');
  
  preg_match('/(?<=Duration: )(\d{2}:\d{2}:\d{2})\.\d{2}/', $result, $match);
  
  print_r($match);
  
  ?>

  How can I get the video duration from a file hosted on amazon s3 with ffmpeg or another tool ?