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• FFMpeg creates MP4 which no browser can decode, but it can be played in VLC

  21 octobre 2013, par wvxvw

  How can I debug what happened ? I've tried this with variations to generate a short video from a single image :

  ffmpeg -loop 1 -i black.png -vcodec libx264 -b 1500k -s 640x360 -t 1 out.mp4

  tried :

  1. Changing aspect ration (or omitting it).
  2. using -image2 instead of -loop.
  3. omitting bitrate.
  4. creating longer videos.
  5. also tried different syntax for specifying video codec : -v:c libx264.
  6. tried mpeg instead of libx264.

  In every case the effect is the same. The video plays in VLC, but not in the browser.

• Converting FFmpeg frame to OpenGL ES texture

  10 juillet 2015, par joe

  I’m trying to convert from a video using FFmpeg to an OpenGL ES texture in jni, but all that I get is a black texture. I have output the OpenGL with the glGetError(), but there is no error.

  Here is my code :

  void* pixels;
  
  int err;
  
  int i;
  
  int frameFinished = 0;
  
  AVPacket packet;
  
  static struct SwsContext *img_convert_ctx;
  
  static struct SwsContext *scale_context = NULL;
  
  int64_t seek_target;
  
  
  
   int target_width = 320;
  
   int target_height = 240;
  
   GLenum error = GL_NO_ERROR;
  
   sws_freeContext(img_convert_ctx);  
  
  
  
  i = 0;
  
  while((i==0) && (av_read_frame(pFormatCtx, &packet)>=0)) {
  
          if(packet.stream_index==videoStream) {
  
          avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished, &packet);
  
  
  
          if(frameFinished) {
  
              LOGI("packet pts %llu", packet.pts);
  
              img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height, 
  
                     pCodecCtx->pix_fmt, 
  
                     target_width, target_height, PIX_FMT_RGB24, SWS_BICUBIC, 
  
                     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);
  
                  LOGI("sws_scale");
  
  
  
                  videoTextures = new Texture*[1];
  
                  videoTextures[0]->mWidth = 256; //(unsigned)pCodecCtx->width;
  
                  videoTextures[0]->mHeight = 256; //(unsigned)pCodecCtx->height;
  
                  videoTextures[0]->mData = pFrameRGB->data[0];
  
  
  
                  glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  
  
  
                  glGenTextures(1, &(videoTextures[0]->mTextureID));
  
                  glBindTexture(GL_TEXTURE_2D, videoTextures[0]->mTextureID);
  
                  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); 
  
                  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  
  
  
                  if(0 == got_texture)
  
                  {
  
                      glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, videoTextures[0]->mWidth, videoTextures[0]->mHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid *)videoTextures[0]->mData);
  
  
  
                      glTexSubImage2D(GL_TEXTURE_2D, 0, 0,0, videoTextures[0]->mWidth, videoTextures[0]->mHeight, GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid *)videoTextures[0]->mData);
  
                  }else
  
                  {
  
                      glTexSubImage2D(GL_TEXTURE_2D, 0, 0,0, videoTextures[0]->mWidth, videoTextures[0]->mHeight, GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid *)videoTextures[0]->mData);
  
  
  
                  }
  
  
  
                  i = 1;
  
                  error = glGetError();
  
                  if( error != GL_NO_ERROR ) {
  
                      LOGE("couldn't create texture!!");
  
                         switch (error) {
  
                          case GL_INVALID_ENUM:
  
                          LOGE("GL Error: Enum argument is out of range");
  
                          break;
  
                          case GL_INVALID_VALUE:
  
                              LOGE("GL Error: Numeric value is out of range");
  
                          break;
  
                          case GL_INVALID_OPERATION:
  
                              LOGE("GL Error: Operation illegal in current state");
  
                          break;
  
                          case GL_OUT_OF_MEMORY:
  
                              LOGE("GL Error: Not enough memory to execute command");
  
                          break;
  
                          default:
  
                              break;
  
                         }
  
                  }
  
          }
  
      }
  
      av_free_packet(&packet);
  
  }

  I have succeeded in changing pFrameRGB to a java bitmap， but I just want to change it to a texture in the c code.

  Edit1 I have output the Texture ID, it is 0 ; could texture ID be zero ? I changed my code
  but it always be zero.

  Edit2
  the Texture display, but it is a mess.

• avfilter/vidstabtransform : allow negative zoom.

  13 septembre 2013, par Georg Martius

  avfilter/vidstabtransform : allow negative zoom.
  This is useful in addition to crop=black.
  Signed-off-by : Clément Bœsch <clement@stupeflix.com>
  

  • [DH] libavfilter/vf_vidstabtransform.c