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• “only position independent executables (PIE) are supported”

  3 juin 2015, par Karthikeyan

  I am using FFMPEG support library to convert bunch of images to video. It works fine on earlier version of the lollipop. But in the lollipop it generates the following error. ***error: only position independent executables (PIE) are supported.*** I know the PIE Security restrictions has been changed in lollipop, but i don’t know how to fix it.

  From my knowledge it may have two possible solutions,

  either

  we need to relocate the FFMPEG library assets to the SDCard and we have to refer them from our coding, if this is the answer what are all the steps to be followed ?

  or

  Is there any update in the FFMPEG library for android lollipop.

  If both are wrong can you provide me with the proper solution.

  Many thanks...

  Here is my code

     try {
  
              String[] ffmpegCommand = {"/data/data/com.mobvcasting.mjpegffmpeg/ffmpeg", "-r", ""+p.getPreviewFrameRate(), "-b", "1000000", "-vcodec", "mjpeg", "-i", 
  
                      Environment.getExternalStorageDirectory().getPath() + "/req_images/frame_%05d.jpg", Environment.getExternalStorageDirectory().getPath() + "/req_images/video.mov"};
  
  
  
              ffmpegProcess = new ProcessBuilder(ffmpegCommand).redirectErrorStream(true).start();            
  
  
  
              OutputStream ffmpegOutStream = ffmpegProcess.getOutputStream();
  
              BufferedReader reader = new BufferedReader(new InputStreamReader(ffmpegProcess.getInputStream()));
  
  
  
              String line;
  
  
  
              Log.v(LOGTAG,"***Starting FFMPEG***");
  
              while ((line = reader.readLine()) != null)
  
              {
  
                  Log.v(LOGTAG,"***"+line+"***");
  
              }
  
              Log.v(LOGTAG,"***Ending FFMPEG***");
  
  
  
  
  
          } catch (IOException e) {
  
              e.printStackTrace();
  
          }
  
  
  
          if (ffmpegProcess != null) {
  
              ffmpegProcess.destroy();        
  
          }

• Is it possible to pregenerate m3u8 file ? (the playlist only) and skip the transcoding ?

  30 mai 2024, par Jonathan Lightbringer

  I am trying to create a media server, and only want to transcode video when it's played. However I need the playlist in advance so that the client play can load the video metadata. Is this possible ?

  


  I want to do something like this :

  


  Client -> GET m3u8 (pregenerated in advance)
Client -> GET ts -> Transcode only this single ts file
Client -> GET ts -> Transcode only this single ts file
Client -> GET ts -> Transcode only this single ts file


  


  I don't want to transcode the entire video at once, I want to be able to only transcode the part that is requested.

  


  Is this possible ? Also open to using MPEG-DASH instead if needed.

  


• Hardware decoding using vaapi [on hold]

  15 août 2017, par Orient

  I am trying to replicate hardware decoding using vaapi. My ultimate goal is to get an OpenGL texture wich I whant to get from a vasurface buffer.

  I took as a base https://github.com/gbeauchesne/ffvademo/tree/master/src
  which looks less intimidating than other examples. My initial understanding was that packets were somehow rendered to surfaces (render targets) and at the same time got converted. But it looks like the loop after some nested calls boils down to avcodec_decode_video2 (app_decode_frame -> ffva_decoder_get_frame -> decoder_get_frame -> decoder_run -> decode_packet -> avcodec_decode_video2), which in turn would call codec->decode. So it resembles the way decoding is done on CPU.

  Could anybody explain why this whoud be considered hw decoding ?