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• How to Manage User Uploaded Content and Storage

  6 novembre 2014, par Ben

  I’m building an app in PHP (Laravel 4 framework) where a teacher in their account can create a digital lesson for a student. Digital lessons can contain the following content :

  • Text (text from form, .doc, .txt, .pdf, etc.)
  • Images (.gif, .png, .jpg etc.)
  • Video (.avi, .mov, .mp4, etc.)
  • Audio (.mp3, etc.)

  Raw text entered from forms can obviously be stored in the DB against the lesson_id. All the other content formats will need to be stored somewhere, where I can manage and read the files, as well as keep track of the teachers storage total as I plan to bill for storage thresholds at 5GB, 10GB etc.

  On the create a lesson page, content files need to be uploaded as lesson attachments before the lesson is saved, so a teacher can visually see all the lessons content, and then hit save to create the lesson instantly.

  Here’s what I’ve come up with :

  1. Upload all lesson file attachments to AWS S3 to the teachers dedicated bucket, before the lesson is created. Add the teachers ID and date time to each filename.

  2. Force all uploaded video / audio files to be converted to .mp4, .mp3, etc. if they are not in an iDevice friendly format or they exceed a file size limit. Use FFmpeg to do this.

  3. When the lesson is saved and created, record the S3 file URL’s against the lesson ID in the DB.

  4. If the lesson has not been created after a specific period of time, run a cron job to check for uploaded S3 files with no lesson and delete them.

  I am unsure what is the best way to solve this problem as user uploaded content management is really new to me.

  What do you think of this approach ? Can you recommend an improved or better way to solve this problem ?

• FFMPEG Start 2 videos at the same time but hide one until the other is finished

  23 mai 2016, par GreenGiant

  I have a generic intro sequence (no audio) and a main video clip. I want the audio from the main clip to play as the intro sequence is playing then the video to switch from the finished intro sequence to the main video. So almost like playing both videos at the same time but hiding one until the other is finished. Is this possible with ffmpeg ? Almost like a send to back function for the video on the main clip (but keep it’s audio rolling so it’s in sync when it shows as the intro clip finishes).

• How can i obtain raw frames with out writing them to disk using ffmpeg ?

  12 décembre 2018, par Abhijeet

  I have to use ffmpeg to detect shot change in a video, for which i need to monitor and each and every frame and save only the required ones. Writing all 30 frames to disk and then choosing takes a lot of time and is impractical, is there a way to get the decoded frames in a raw form before saving them to the disk ?