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• Trying to get thumbnail from a video by using ffmpeg

  27 mars 2014, par Khaled Hasania

  I'm trying to get thumbnail from a video , i did test this code on a side project non Yii project and it's working fine here is my action code.

          $ffmpeg = "C:\\ffmpeg\\bin\\ffmpeg";
  
          $videoFile = $_FILES['Project']['tmp_name']['file'];
  
          $imageFile = Yii::app()->basePath ."/../1.jpg";
  
          $size = "200x200";
  
          $getFromSecond = 5;
  
  
  
          $cmd = "$ffmpeg -i $videoFile -an -ss $getFromSecond -s $size $imageFile";
  
          shell_exec($cmd);

  This action called throw ajax by using dropzone Yii extension.

     $imageFile = "E:\xampp\htdocs\tme\protected\..\1.jpg"

• What is the most efficient way to broadcast a live stream ? [closed]

  3 août 2020, par Harsh

  I want to build a live streaming system for a classroom. The amount on information on this subject is so confusing. These are the features/requirements that I want to have in my app :

  


  

  1. Room type system.

  


  2. One teacher - N students (N<200).

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  3. Broadcast video/audio. This needs to be only 1 way. (1T ---> 200S)

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  4. Audio chat should be possible if a teacher allows a student to speak.

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  5. Need not to record the session, though it would be a great feature to have.

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  Now, from my research I have established there are many ways to go about it. The best one to me seems using WebRTC. In that case I do not have to worry about the platform that much.&#xA;WebRTC needs a STUN/TURN server, that can be easily set-up using the coturn project.&#xA;I'll also need a SFU which forwards my stream to the client, like Janus or Mediasoup.&#xA;But that's where I'm getting confused.

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  Can I not directly use a live stream, send it to the server, transcode it in real time using ffmpeg to HLS/DASH and publish it to a S3 bucket from where the users can access it. Wouldn't that be more efficient and able to handle much more students easily.

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  For the audio part I could just use the p2p functionality of webrtc in the browser itself, so no need to route that through the server.

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  That is how far I've come to understand the system. I still don't completely understand how SFU works and I'm confused about how many live streams can one server handle (say a 4C/8GB). Or if using ffmpeg on VPS is a bad thing and I should use the AWS services instead ?

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  Can someone please help me understand this ?

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  Thanks !

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• How to get and use FFMPEG in a Objective-C OS X app

  2 septembre 2015, par Coiman

  I have an application where I need to use FFMPEG for something (video from AVCaptureSession encoded to MPEG(1)).

  So far I have been looking for ways to build and use FFMPEG in my project but I have not found a way for OS X. All of the wrappers I have found so far are for iOS instead of OS X.

  I need a solution that works on OS X and I would prefer if you explained how to use it a bit (build instructions, getting it into the Xcode project, code samples).

  Thanks in advance for your help. :)