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• I have been trying to figure out how to make video of selected images with FFmpeg

  3 décembre 2016, par Manish Godhani

  I am working with Android videos and I know how to determine the series of images using gallary View. But I’m stuck on FFmpeg now.

  With the below code I am getting some images from gallery :

  btnSelect.setOnClickListener(new View.OnClickListener() {
  
  
  
    public void onClick(View v) {
  
      final int len = thumbnailsselection.length;
  
      int cnt = 0;
  
      String selectImages = "";
  
  
  
      for (int i = 0; i < len; i++) {
  
        if (thumbnailsselection[i]) {
  
          cnt++;
  
          selectImages = selectImages + arrPath[i] + "|";
  
        }
  
      }
  
  
  
      if (cnt == 0) {
  
        Toast.makeText(getApplicationContext(), "Please select at least one image", Toast.LENGTH_LONG).show();
  
      } else {
  
  
  
        Log.d("SelectedImages", selectImages);
  
        Intent i = new Intent();
  
        i.putExtra("data", selectImages);
  
        setResult(Activity.RESULT_OK, i);
  
        finish();
  
      }
  
    }
  
  });

  Any clues ?

  Thanks.

• configure : use check_lib2 for cuda and cuvid

  12 novembre 2016, par Hendrik Leppkes

  configure : use check_lib2 for cuda and cuvid
  Fixes building for Windows x86 with MSVC using the link libraries distributed with the CUDA SDK.
  check_lib2 is required here because it includes the header to get the full signature of the
  
  function, including the stdcall calling convention and all of its arguments, which enables
  
  the linker to determine the fully qualified object name and resolve it through the import
  
  library, since the CUDA SDK libraries do not include un-qualified aliases.
  

  • [DH] configure

• Cleaning up after av_frame_get_buffer

  4 novembre 2016, par Jason C

  There are two aspects of my question. I’m using libav, ffmpeg, 3.1.

  ---

  First, how do you appropriately dispose of a frame whose buffer has been allocated with av_frame_get_buffer ? E.g. :

  AVFrame *frame = av_frame_alloc();
  
  frame->width = ...;
  
  frame->height = ...;
  
  frame->format = ...;
  
  av_frame_get_buffer(frame, ...);

  Do any buffers have to be freed manually, beyond the call to av_frame_free(frame) ? The documentation doesn’t mention anything special, but in my experience the ffmpeg documentation often leaves out important details, or at least hides them in places far away from the obvious spots. I took a look at the code for av_frame_free and av_frame_unref but it branched out quite a bit and I couldn’t quite determine if it covered everything.

  ---

  Second, if something beyond av_frame_free needs to be done, then is there any catch-all way to clean up a frame if you don’t know how its data has been allocated ? For example, assuming someBuffer is already allocated with the appropriate size :

  AVFrame *frame2 = av_frame_alloc();
  
  frame2->width = ...;
  
  frame2->height = ...;
  
  frame2->format = ...;
  
  av_image_fill_arrays(frame2->data, frame2->linesize, someBuffer, 
  
                       frame2->format, frame2->width, frame2->height, 1);

  Is there a way to free both frame and frame2 in the above examples using the exact same code ? That is frame and its data should be freed, and frame2 should be freed, but not someBuffer, since libav did not allocate it.