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• Getting metadata from a video using Paperclip-FFMPEG in Rails 3.2.6

  16 novembre 2012, par Graeme

  While still a Rails newbie, I've managed to get Paperclip-FFMPEG working. However, I'd like to extract some metadata from the uploaded video, in particular the length of the video. The README suggests this is possible, but I'm struggling to understand what I need to do :

  You may optionally add <attachment>_meta to your model and paperclip-ffmpeg will add information about the processed video.
  
  </attachment>

  Let's say the Paperclip attribute I have in my model is called "sourcefile". If I'm reading these instructions correctly, does this mean I need to add an extra attribute called sourcefile_meta ? Do I need to add generate a migration file to add this extra column to the model's table ? How would I get access to the length of the video in my view ? Should it be something like this :

  <p>Length: &lt;%= mymodel.sourcefile_meta.length %></p>

  Any pointers would be most useful, as I've hit a bit of a brick wall ! Thanks !

• AAC encoder : Fix rate control on twoloop.

  4 mai 2013, par Claudio Freire

  AAC encoder : Fix rate control on twoloop.
  Fixes a case where multichannel bitrate isn’t accurately
  
  targetted by psy model alone, never achieving the target bitrate.
  
  Now fixed.
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/aaccoder.c

• Video Processing via Bluetooth

  16 juillet 2012, par kerim yucel

  The application I am currently developing processes each frames using a native code and it should record the video as well. I tried SDK for this purpose but certain restrictions didn't allow me to do so, so I switched to NDK for a video recording code piece.

  Apparently, my algorithm seriously uses CPU, upto %70 percent in the worst case. Before I actually start working on a video recorder, I wanted to try the following approach.

  I will process the preview frames using an android phone and send it to another phone (which uses same application and same model) for recording. My questions are :

  1.Should I try WiFi instead of Bluetooth ? I am developing the application for API 8 so I don't have WiFi-Direct, therefore I should do some socket programming, which would possibly complicate things a bit for me since Bluetooth can easily be set up using SDK.

  2- Will I be available to record the frames as a video at the receiving end ? I will receive each frame with certain metadata embedded to it and should record them using the other phone. I doubt I will be able to do it using SDK, so NDK along with ffmpeg seems to be the best choice ? Any suggestions related to this question will be more than welcome.

  3-Here comes the best part. I am recording the video with the lowest resolution that,after compressed, takes no more than 14mb space for a 10 minute long video. I have to reach the raw frames to send it to other end, encode and compress it. Any ideas related to possible flooding of Bluetooth/Wi-Fi because of big-sized raw frames ?

  Any other approaches and answers will be much appreciated. Thanks.