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• avformat/mov : parse multiple iTunes cover images

  29 mars 2018, par Timo Teräs

  avformat/mov : parse multiple iTunes cover images
  Multiple cover images are supported by having multiple data atoms
  
  inside the covr atom. AtomicParsley and mutagen amongst others
  
  support and document this construct.
  Signed-off-by : Timo Teräs <timo.teras@iki.fi>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/mov.c

• Elixir long running background task doesn't complete, sometimes crashes

  29 mars 2018, par Kulix

  As a little bit of background, I have an endpoint that is responsible for video upload. What I want to do, is copy the video file to a temporary location from the request, and spin up an asynchronous task (ffmpeg shell process) to transcode that video in the background so that my endpoint can return a 200 in a timely manner, and the response does not wait for ffmpeg to finish transcoding that video.

  Here is my code from the controller.

  def create(conn, %{"file" => file ... })
  
      uuid = Video.uuid()
  
      tmp_path = Application.get_env(:myapp, :video_tmp_path) <> "/" <> uuid
  
      :ok = File.cp(file.path, tmp_path)
  
      VideoService.process(tmp_path, final_path)

  The inside of VideoService looks like the following.

  defmodule MyApp.Services do
  
    defmodule VideoService do
  
      def process(tmp_path, final_path) do
  
        Task.start_link fn ->
  
          System.cmd("ffmpeg", ["-i", tmp_path, final_path, "-hide_banner"])
  
          File.rm(tmp_path)
  
        end
  
      end
  
    end
  
  end

  The problem I am having here is that no matter what, nothing past the System.cmd("ffmpeg") call executes in the VideoService, and sometimes the System.cmd call doesn’t even spin up an ffmpeg process. Am I doing something wrong here ? What I need is a way to spin this ffmpeg shell process out in the background from the controller / service and respond with a 200 on video upload. Thanks for help in advance. I am new to elixir / OTP, so I’m sure I’m doing something stupid.

  I also randomly see the following error

  erl_child_setup: failed with error 32 on line 240

• ffmpeg Command stop executing in background after the application kill

  26 mars 2018, par Amjad Khan

  FFmpeg Command are executed and that are working well, Implemented on android.

  But I am facing problem when the user kill the application the command which I have executed it is terminated.

  I have created background service, which is running in the background but the command stop in the middle, is there any way to handle it

  Code here

  ffmpeg.execute(command, new ExecuteBinaryResponseHandler() {
  
      @Override
  
      public void onFailure(String s) {
  
          Log.e(TAG, "FAILED with output : " + s);
  
      }
  
  
  
      @Override
  
      public void onSuccess(String s) {
  
          Log.e(TAG, "SUCCESS with output : " + s);
  
      }
  
  
  
      @Override
  
      public void onProgress(String s) {
  
        //This method get stoped
  
      }
  
  
  
      @Override
  
      public void onStart() {
  
  
  
      }
  
  
  
      @Override
  
      public void onFinish() {
  
  
  
      }
  
  });