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• Android - ffmpeg best approach

  25 février 2014, par rohit

  I am trying to build ffmpeg for android. I want to achieve two things with it.
  1. Rotate video
  2. Join two or more videos.

  There are two approaches for having ffmpeg in my application.
  1. Having ffmpeg executable, copying it to /data/package/ and executing ffmpeg commands.
  2. Build ffmpeg library .so file with ndk and write jni code etc.

  Which approach is best according to my needs ? And can I have some code snippets that follows those approaches ?

• problem in loading texture from AVFrame(android)

  25 mars 2013, par SieuTruc

  I get a problem when loading data from AVFrame to openGL :

   int target_width = 320;
  
                  int target_height = 240;
  
                  img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height,
  
                                             pCodecCtx->pix_fmt,
  
                                             target_width, target_height, PIX_FMT_RGBA, SWS_FAST_BILINEAR,
  
                                             NULL, NULL, NULL);
  
                  if(img_convert_ctx == NULL) {
  
                      LOGE("could not initialize conversion context\n");
  
                      return;
  
                  }
  
                  sws_scale(img_convert_ctx, (const uint8_t* const*)pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameRGB->data, pFrameRGB->linesize);
  
                  //free(data);
  
                  int line=target_width*target_height*4;
  
                  data=(char*)malloc(line);
  
                  if (!data)
  
                      LOGE("create data frame fail");
  
                  LOGE("successful data");
  
                  filldata(data,pFrameRGB,target_width,target_height);

  with function filldata as :

      static void filldata(char *data,AVFrame *pFrame,int w,int h)
  
  {uint8_t *frameLine;
  
      int  yy;
  
      int i=0;
  
  
  
  for (yy = 0; yy < h; yy++) {
  
  
  
  frameLine = (uint8_t *)pFrame->data[0] + (yy * pFrame->linesize[0]);
  
  
  
  int xx;
  
  
  
  for (xx = 0; xx < w; xx++) {
  
              int in_offset = xx * 4;
  
  
  
  data[i++] = frameLine[in_offset];
  
  
  
  data[i++] = frameLine[in_offset+1];
  
  
  
  data[i++] = frameLine[in_offset+2];
  
  
  
  data[i++] = frameLine[in_offset+3];
  
          }
  
      }
  
  }

  After that i use data to transfer to

  glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, *wi, *he, 0, GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid*)data);

  but it cannot show texture, maybe data above and data in function gltextimage2D are different.
  Please help me figure out what is the format for gltextimage2D so i can configure data to show texture. OR anyone has some sample code to show me.

• how to use ffmpeg to do video compression in android [duplicate]

  26 février 2014, par user963241

  This question already has an answer here :

  • Compress Videos using FFMPEG and JNI
    
    1 answer
    

  I tried to compile the ffmpeg to shared library to android

  where can i find the jni ffmpeg sample code to reduce the video size ?
  thanks.