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• Show progress of a video conversion with c# (see details please)

  25 février 2015, par ChrisCreateBoss

  I’m using WinForms. I want to show the progress of a video conversion, I’m currently using the NReco.VideoConverter, I’ve tried FFLib.Encoder too, it has an EventHandler named Progress, but I can’t make it work with the progressBar.

  I’ve tried progressBar1.Value += converter.Progress;, also tried using a "percentHandler", and it failed.

  Hope someone can help me. Also, if someone knows about a better video conversion library, please let me know.

  Thnaks in advance

• video frames render slow using opengl and ffmpeg in iphone

  17 février 2012, par resident_

  I'm developing an video player for iPhone. I'm using ffmpeg libraries to decode frames of video and I'm using opengl 2.0 to render the frames to the screen.

  But my app is very slow render the frames and some videos played slowly.

  I have played AVI, MOV, FLV, MP4 and WMV, and only several AVI files are correct played.

  I don't have much idea of ffmpeg and opengl, and I have used a tutorials and examples until now. But I think that the problem can be two things :

  1. The render method is very slowly. I don't use correctly the glTexSubImage2D function.

  2. I don't scale the frames correctly. I don't use correctly the sws_getContext function.

  I'm here parts of my code, to see if anyone can help me.

  So I use sws_getContext

   ctx->p_sws_ctx = sws_getContext(ctx->p_video_ctx->width, 
  
                                  ctx->p_video_ctx->height, 
  
                                  ctx->p_video_ctx->pix_fmt, 
  
                                  ctx->p_video_ctx->width, 
  
                                  ctx->p_video_ctx->height,
  
                                  PIX_FMT_RGB565, SWS_FAST_BILINEAR, NULL, NULL, NULL);
  
  
  
  
  
  
  
  
  
  // Framebuffer for RGB data
  
  ctx->p_frame_buffer = malloc(avpicture_get_size(PIX_FMT_RGB565,
  
                                                  ctx->p_video_ctx->width, 
  
                                                  ctx->p_video_ctx->height));
  
  
  
  avpicture_fill((AVPicture*)ctx->p_picture_rgb, ctx->p_frame_buffer, PIX_FMT_RGB565, 
  
                 ctx->p_video_ctx->width, 
  
                 ctx->p_video_ctx->height);

  My render method of opengl 2.0

  - (void) render: (uint8_t*) buffer

  [EAGLContext setCurrentContext:context] ;

  glBindFramebuffer(GL_FRAMEBUFFER, defaultFramebuffer);
  
  glViewport(0, 0, backingWidth, backingHeight);
  
  
  
  glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
  
  
  
  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  
  
  
  // OpenGL loads textures lazily so accessing the buffer is deferred until draw; notify
  
  // the movie player that we're done with the texture after glDrawArrays.          
  
  glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, mFrameW, mFrameH, GL_RGB,GL_UNSIGNED_SHORT_5_6_5, buffer);
  
  
  
  glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
  
  
  
  
  
  [moviePlayerDelegate bufferDone];
  
  
  
  glBindRenderbuffer(GL_RENDERBUFFER, colorRenderbuffer);
  
  [context presentRenderbuffer:GL_RENDERBUFFER];

  Someone, can I Help me ?

  Thanks,

• CANNOT LINK EXECUTABLE error with required libs loaded. How to link them properly ? [duplicate]

  11 septembre 2019, par dentex

  This question already has an answer here :

  • Android NDK - Library not found CANNOT LINK EXECUTABLE - how to set LD_LIBRARY_PATH ?
    
    1 answer
    

  edit : I’m aware of the possible duplicate, but the answer it’s not directly applicable. I’m using ProcessBuilder and not Runtime.getRuntime().exec :

  public int execProcess(List<string> cmds, ShellUtils.ShellCallback sc) {    
  
      StringBuilder cmdlog = new StringBuilder();
  
      for (String cmd : cmds) {
  
           cmdlog.append(' ');
  
      }
  
      Utils.logger("v", cmdlog.toString(), DEBUG_TAG);
  
  
  
      ProcessBuilder pb = new ProcessBuilder();
  
      pb.directory(mBinFileDir);
  
      pb.command(cmds);
  
  
  
      Process process = null;
  
      int exitVal = 1; // Default error
  
      try {
  
          process = pb.start();
  
  
  
          StreamGobbler errorGobbler = new
  
          StreamGobbler(process.getErrorStream(), "ERROR", sc);
  
  
  
          StreamGobbler outputGobbler = new
  
          StreamGobbler(process.getInputStream(), "OUTPUT", sc);
  
  
  
          errorGobbler.start();
  
          outputGobbler.start();
  
  
  
          exitVal = process.waitFor();
  
  
  
          sc.processComplete(exitVal);
  
  
  
       } catch (Exception e) {
  
           Log.e(DEBUG_TAG, "Error executing ffmpeg command!", e);
  
       } finally {
  
           if (process != null) {
  
               Utils.logger("w", "destroyng process", DEBUG_TAG);
  
               process.destroy();
  
           }
  
      }
  
      return exitVal;
  
  }
  
  </string>

  ---

  I have two versions on FFmpeg compiled for android : with and without liblame enabled.

  When I load in /data/data/<>/app_bin/ the FFmpeg binary compiled with NO lame support, it extracts audio from video without an issue. But when I use the one with lame support enabled, I get the error below into the log.

  Required libs, also compiled for android, are correctly loaded when shipped into the libs project folder with System.loadLibrary("lame").

  I was wondering if there is something else to do in order to properly make the FFmpeg binary find the libs.
  Those are the same libs given to the NDK to build the FFmpeg binary.

  D/dalvikvm(13741): Trying to load lib /data/app-lib/<>/liblame.so 0x40ffed08
  
  D/dalvikvm(13741): Added shared lib /data/app-lib/<>/liblame.so 0x40ffed08
  
  D/dalvikvm(13741): No JNI_OnLoad found in /data/app-lib/<>/liblame.so 0x40ffed08, skipping init
  
  D/FfmpegController(13741): Trying to chmod '/data/data/<>/app_bin/ffmpeg' to: 755
  
  V/FfmpegController(13741): /data/data/<>/app_bin/ffmpeg -y -i /storage/sdcard0/Download/video.webm -vn -acodec copy /storage/sdcard0/Download/audio.ogg 
  
  >>>>>> ---------- <<<<<<
  
  D/DownloadsService(13741): soinfo_link_image(linker.cpp:1673): could not load library "liblame.so" needed by "/data/data/<>/app_bin/ffmpeg"; caused by load_library(linker.cpp:771): library "liblame.so" not foundCANNOT LINK EXECUTABLE
  
  >>>>>> ---------- <<<<<<
  
  I/DownloadsService(13741): FFmpeg process exit value: 255

  I’m not attaching code because it’s fairly straightforward :

  • download the FFmpeg binary (it’s not shipped with the app) ;
  • copy the binary from the download folder to /data/data/<>/app_bin/ ;
  • chmod 755 ;
  • execute from there and read the output.

  Please comment if something else is required.