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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 ?

• Bitmaps to video in C#

  9 septembre 2013, par user2754599

  DONE SO FAR

  I use AForge MJPEGStream to get bitmaps from different IPcams and display them in my app. Now I want to record multiple (like at least 8) of these bitmapstreams to the local HDD. I already used AForge AVIWriter (DLL) to write the file of 1 stream from a List, but because those Bitmaps all go in RAM I had to write it to HDD earlier (so I can record 8 streams at once). So I tried to write a frame every NewFrame-event to HDD. The problem with this is that AVIWriter.Open(string fileName, int width, int height) uses Win32.OpenFileMode.Create instead of Win32.OpenFileMode.ReadWrite and so deleting the videofile instead of opening it to add a frame.

  Preferred goal

  Record multiple MJPEG streams to disk as video files(could be done from the NewFrame-even described above, which provides Bitmaps). The very best result would be 1 hour long .MKV files encoded with X264. I don't care how to achieve this goal as long as it's done within my existing project in C# (so no need to keep using AForge).

• avformat : make avformat_close_input() more tolerant.

  3 septembre 2013, par Clément Bœsch

  avformat : make avformat_close_input() more tolerant.
  The purpose of this commit is to make error management simpler and less
  
  error prone, just like av_free() which is safe with NULL.
  

  • [DH] doc/APIchanges
  • [DH] libavformat/utils.c
  • [DH] libavformat/version.h