Recherche avancée

Sur d’autres sites (6379)

• How do steps for make FFMPEG

  11 août 2017, par mobina varmazyar

  I do step 1 to step 6. I am sure that I take NDK and ffmepeg source in valid address but when I execute

  ./build_android.sh

  in the terminal the following lines will be shown :

  @mv103 telegram

  Can send for me libraries whose can successfully did step 1 to 6 ?

  /build_android.sh: line 8: --prefix=/root/桌面/rajabi/android-ndk-
  
  r12b/sources/ffmpeg-3.3.3/android/arm: No such file or directory
  
  ./build_android.sh: line 9: --enable-shared: command not found

• Audio not working with FFMPEG conversion

  17 juillet 2017, par mikelbring

  I am trying to convert an avi file to flv with an fairly simple ffmpeg command :

  ffmpeg -i dbkai12.avi -ab 96k -b 700k -ar 44100 -s 640x480 -acodec mp3 video.flv

  The video does exactly what I want, just no audio. I didnt come up with these numbers, just pulled them from different sources.

  Also tried :

  ffmpeg -i video.avi -ar 22050 -ab 32 -f flv -s 320x240 video.flv

  Same result.

• Implementing a chained overlay filter with the Libavfilter library in Android NDK

  14 mars 2014, par gookman

  I am trying to use the overlay filter with multiple input sources, for an Android app. Basically, I want to overlay multiple video sources on top of a static image.
  I have looked at the sample that comes with ffmpeg and implemented my code based on that, but things don't seem to be working as expected.

  In the ffmpeg filtering sample there seems to be a single video input. I have to handle multiple video inputs and I am not sure that my solution is the correct one. I have tried to find other examples, but looks like this is the only one.

  Here is my code :

  AVFilterContext **inputContexts;
  
  AVFilterContext *outputContext;
  
  AVFilterGraph *graph;
  
  
  
  int initFilters(AVFrame *bgFrame, int inputCount, AVCodecContext **codecContexts, char *filters)
  
  {
  
      int i;
  
      int returnCode;
  
      char args[512];
  
      char name[9];
  
      AVFilterInOut **graphInputs = NULL;
  
      AVFilterInOut *graphOutput = NULL;
  
  
  
      AVFilter *bufferSrc  = avfilter_get_by_name("buffer");
  
      AVFilter *bufferSink = avfilter_get_by_name("buffersink");
  
  
  
      graph = avfilter_graph_alloc();
  
      if(graph == NULL)
  
          return -1;
  
  
  
      //allocate inputs
  
      graphInputs = av_calloc(inputCount + 1, sizeof(AVFilterInOut *));
  
      for(i = 0; i <= inputCount; i++)
  
      {
  
          graphInputs[i] = avfilter_inout_alloc();
  
          if(graphInputs[i] == NULL)
  
              return -1;
  
      }
  
  
  
      //allocate input contexts
  
      inputContexts = av_calloc(inputCount + 1, sizeof(AVFilterContext *));
  
      //first is the background
  
      snprintf(args, sizeof(args), "video_size=%dx%d:pix_fmt=%d:time_base=1/1:pixel_aspect=0", bgFrame->width, bgFrame->height, bgFrame->format);
  
      returnCode = avfilter_graph_create_filter(&inputContexts[0], bufferSrc, "background", args, NULL, graph);
  
      if(returnCode < 0)
  
          return returnCode;
  
      graphInputs[0]->filter_ctx = inputContexts[0];
  
      graphInputs[0]->name = av_strdup("background");
  
      graphInputs[0]->next = graphInputs[1];
  
  
  
      //allocate the rest
  
      for(i = 1; i <= inputCount; i++)
  
      {
  
          AVCodecContext *codecCtx = codecContexts[i - 1];
  
          snprintf(args, sizeof(args), "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d",
  
                      codecCtx->width, codecCtx->height, codecCtx->pix_fmt,
  
                      codecCtx->time_base.num, codecCtx->time_base.den,
  
                      codecCtx->sample_aspect_ratio.num, codecCtx->sample_aspect_ratio.den);
  
          snprintf(name, sizeof(name), "video_%d", i);
  
  
  
          returnCode = avfilter_graph_create_filter(&inputContexts[i], bufferSrc, name, args, NULL, graph);
  
          if(returnCode < 0)
  
              return returnCode;
  
  
  
          graphInputs[i]->filter_ctx = inputContexts[i];
  
          graphInputs[i]->name = av_strdup(name);
  
          graphInputs[i]->pad_idx = 0;
  
          if(i < inputCount)
  
          {
  
              graphInputs[i]->next = graphInputs[i + 1];
  
          }
  
          else
  
          {
  
              graphInputs[i]->next = NULL;
  
          }
  
      }
  
  
  
      //allocate outputs
  
      graphOutput = avfilter_inout_alloc();   
  
      returnCode = avfilter_graph_create_filter(&outputContext, bufferSink, "out", NULL, NULL, graph);
  
      if(returnCode < 0)
  
          return returnCode;
  
      graphOutput->filter_ctx = outputContext;
  
      graphOutput->name = av_strdup("out");
  
      graphOutput->next = NULL;
  
      graphOutput->pad_idx = 0;
  
  
  
      returnCode = avfilter_graph_parse_ptr(graph, filters, graphInputs, &graphOutput, NULL);
  
      if(returnCode < 0)
  
          return returnCode;
  
  
  
      returnCode = avfilter_graph_config(graph, NULL);
  
          return returnCode;
  
  
  
      return 0;
  
  }

  The filters argument of the function is passed on to avfilter_graph_parse_ptr and it can looks like this : [background] scale=512x512 [base]; [video_1] scale=256x256 [tmp_1]; [base][tmp_1] overlay=0:0 [out]

  The call breaks after the call to avfilter_graph_config with the warning :
  Output pad "default" with type video of the filter instance "background" of buffer not connected to any destination and the error Invalid argument.

  What is it that I am not doing correctly ?