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• Can I make calls to APIs such as youtube-dl and ffmpeg from a chrome-app ?

  8 janvier 2015, par ErickR

  First of all, I haven’t started the implementation of the system I’m about to describe, as I didn’t want to commit on implementing something I did not know if was possible.

  So, what I’m trying to achieve is to build a chrome-app to download the audio from certain websites (e.g. youtube and soundcloud) using youtube-dl, post process it using ffmpeg and then upload it to a cloud service via some api. The reason I want to do it via a chrome-app is because I could do all the work on the client side (no need for servers) and I’d have the ability to insert javascript into the pages using content scripts, which would make the app pretty simple to use (I could create buttons such as ’download song’ and stuff like that).

  Although I have already read the documentation explaining the NaCl Technical Overview and some of the Application Structure, I still am not sure as to whether I would be able to make these calls via some C/C++ module or if I would get denied due to security reasons.

  To summarize : considering that the user has the needed dependencies in his system (youtube-dl, python, ffmpeg and etc.), is it possible to make calls to third party APIs such as the ones described before via a chrome-app using NaCl ?

  Thank you all in advance,

• lavc/mediacodecdec : switch to new decoding API

  29 décembre 2017, par Aman Gupta

  lavc/mediacodecdec : switch to new decoding API
  Using the new API gives the decoder the ability to produce
  
  N frames per input packet. This is particularly useful with
  
  mpeg2 decoders on some android devices, which automatically
  
  deinterlace video and produce one frame per field.
  Signed-off-by : Aman Gupta <aman@tmm1.net>
  
  Signed-off-by : Matthieu Bouron <matthieu.bouron@gmail.com>
  

  • [DH] libavcodec/mediacodecdec.c

• Get different frames from one file ( H264 codec)

  4 décembre 2020, par Алекс Аникей

  I try to transmit video to another client(video call), using library ffmpeg and encoder - libx264, decoder - h264. For this i have one "core" library, which used in two clients.

  


  On sender :

  


  

  • 

    

    1. encode AVFrame and get AVPacket ;

    


    


  


  • 

    

    2. transform AVPacket.data to byte array and length for
transmiting (for debugging i save this byte array to file).

    


    


  


  


  On reciver :

  


  

  • 

    

    1. save recived byte array to file ;

    


    


  


  • 

    

    2. get AVPacket from this byte array ;

    


    


  


  • 

    

    3. decode AVPacket to AVFrame.

    


    


  


  


  Result of this :
array files(saved byte_array), which equals on sender and reciver but some frames are different (some part of frame on reciver is corrupted).
Like this :

  


  What possible reason of this ?