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• Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  28 août 2020, par bbdangar

  I am using this library : com.arthenica:mobile-ffmpeg-full:4.4

  


  Getting this error message while running the command :

  


  final String command = "-y -i "+ inputPath +" -ar 22050 -hls_list_size 1000000 -hls_time 2 -s 640x360 " + outputPath;


  


  here is the complete code :

  


  private void convertVideo() {
        String inputPath = "/storage/emulated/0/Download/video.mp4";
        String outputPath = "/storage/emulated/0/Download/output.m3u8";
        final String command = "-y -i "+ inputPath +" -ar 22050 -hls_list_size 1000000 -hls_time 2 -s 640x360 " + outputPath;
        FFmpeg.executeAsync(command, new ExecuteCallback() {
            @Override
            public void apply(long executionId, int returnCode) {

                if (returnCode == RETURN_CODE_SUCCESS) {
                    Log.i(TAG, "Command execution completed successfully.");
                } else if (returnCode == RETURN_CODE_CANCEL) {
                    Log.i(TAG, "Command execution cancelled by user.");
                } else {
                    Log.i(TAG, String.format("Command execution failed with rc=%d and the output below.", returnCode));
                    Config.printLastCommandOutput(Log.INFO);
                }
            }
        });

    }


  


  here is output log :

  


  2020-08-28 07:05:59.355 10725-10820 W/mobile-ffmpeg: [graph 0 input from stream 0:0 @ 0xe2306c80] sws_param option is deprecated and ignored
2020-08-28 07:05:59.448 10725-10820 E/mobile-ffmpeg: [h264_v4l2m2m @ 0xcb442c00] can't configure encoder
2020-08-28 07:05:59.448 10725-10820 E/mobile-ffmpeg: Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
2020-08-28 07:05:59.463 10725-10820 I/mobile-ffmpeg: Conversion failed!
2020-08-28 07:05:59.465 10725-10725 I/mobile-ffmpeg: ffmpeg version v4.4-dev-416 Copyright (c) 2000-2020 the FFmpeg developers


  


• OpenCV cannot connect to video stream - lack of some codec ?

  25 février 2016, par Chris92

  I use application IPCamera on my mobile phone with Android to output (share) video image from it’s camera to LAN. I can access it on PC browser - that is ok.

  However, I want to make OpenCV capture this video stream from IP address by typing

  VideoCapture cap("http://admin:admin@192.168.0.11:8081/?action=stream?dummy=param.mjpg");
  
   while( cap.isOpened() )
  
   {
  
      Mat frame;
  
      if ( ! cap.read(frame) )
  
          break;
  
  
  
      cout << "Connected!!";
  
  
  
      imshow("lalala",frame);
  
      int k = waitKey(10);
  
      if ( k==27 )
  
          break;
  
  }

  and i got error :

  

  Actual codec, which is used by phone is mjpeg (i read it from application on my mobile). I don’t know if OpenCV supports this, but is that about mobile application uses some kind of unique codec, or my PC lacks it, or maybe C++/OpenCV code is wrong ?

• passing additional values to s3 event notification for lambda consumption

  8 septembre 2017, par user1790300

  I have to write code in react-native that allows a user to upload videos to amazon s3 to be transcoded for consumption by various devices. For the processing after the upload occurs ; I am reviewing two approaches :

  1) I can use Lambda with ffmpeg to handle the transcoding immediately after the uploading occurs (my fear here would be the amount of time required to transcode the videos and the effect on pricing if it takes a considerable amount of time).

  2) I can have s3 pass an sns message to a rest api after the created event occurs and the rest api generate a rabbitmq message that will be processed by worker that will perform the transcoding using ffmpeg.

  Option 1) seems to be the preferable option based on a completion time perspective. How concerned should I be with using 1) considering how long video transcoding might take as opposed to option 2) ?

  Also, regardless, I need a way to pass additional parameters to lambda or along the sns messaging that would allow me to somehow associate the user who uploaded the video with their account. Is there a way to pass additional text-based values to s3 to pass along to lambda or along sns when the upload completes, as a caveat I plan to upload the video directly to s3 using the rest layer(found this answer here : http://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectPUT.html#RESTObjectPUT-responses-examples) ?