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• Joining three videos with FFMpeg [duplicate]

  4 novembre 2016, par M. Saez

  This question is an exact duplicate of :

  • FFmpeg concatenation, no Audio in Final Output
    
    1 answer
    

  I’m trying to merge/join three mp4 videos with ffmpeg ; the first one is a 5 seconds intro without an audio track, then it is the main video and at the end there is a 6 seconds mp4 video also without an audio track.

  All videos are encoded with exactly the same settings, so far i’m trying the concat option and i can join them just fine, the problem is the final video doesn’t have the audio track from the main video.

  This is the command i’m using :

  ffmpeg -f concat -i mylist.txt -c copy output.mp4

  Needless to say, the final video must respect the first 5 seconds without audio and the last 6 seconds.

  Any idea ?, if i prefer something where i don’t need to reencode at all, but if i must, i don’t really mind.

  Thanks !

• Flutter ffmpeg_kit_flutter_full_gpl-6.0.3 PluginRegistry.Registrar flutter version 3.29

  30 avril, par Lisa

  I am using ffmpeg_kit_flutter_full_gpl-6.0.3 for flutter version 3.27 but when upgrading to flutter 3.29, with android, there is an error PluginRegistry.Registrar registrar. Is there any solution to replace the current ffmpeg_kit_flutter_full_gpl because I see this library was updated 17 months ago

  


  /Users/pamcd/.pub-cache/hosted/pub.dev/ffmpeg_kit_flutter_full_gpl-6.0.3/android/src/main/java/com/arthenica/ffmpegkit/flutter/FFmpegKitFlutterPlugin.java:157: error: cannot find symbol
    public static void registerWith(final io.flutter.plugin.common.PluginRegistry.Registrar registrar) {
                                                                                 ^
  symbol:   class Registrar
  location: interface PluginRegistry
/Users/pamcd/.pub-cache/hosted/pub.dev/ffmpeg_kit_flutter_full_gpl-6.0.3/android/src/main/java/com/arthenica/ffmpegkit/flutter/FFmpegKitFlutterPlugin.java:651: error: cannot find symbol
    protected void init(final BinaryMessenger messenger, final Context context, final Activity activity, final io.flutter.plugin.common.PluginRegistry.Registrar registrar, final ActivityPluginBinding activityBinding) {
                                                                                                                                                ^
  symbol:   class Registrar
  location: interface PluginRegistry
2 errors

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':ffmpeg_kit_flutter_full_gpl:compileReleaseJavaWithJavac'.
> Compilation failed; see the compiler error output for details.

* Try:
> Run with --info option to get more log output.
> Run with --scan to get full insights.


  


  Is there any alternative ?

  


• JavaCV Video Player with FFmpeg and JavaFx

  2 juin 2021, par ِِYazdan Naderi

  I want to create a media player using Java CV, but I can not adjust the frame rate
And because of this, some videos play fast and some play slow

  


  Is it possible to read the information of a video through a FFmpegFrameGrraber object and set it in another object to solve the problem ?
Of course, I did this and did not get an answer, but if there is another way, please help

  


  playThread = new Thread(new Runnable() {
            public void run() {
                try {
                    final String videoFilename = "E:\\Java\\s1\\3.mp4";
                    final String videoFilename2 = "E:AudioVideo.mp4";
                    final String videoFilename3 = "E:\\1.mp4";
                    final String videoFilename4 = "E:\\Java\\s1\\3.mp4";


                     FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(videoFilename);



                    grabber.start();

                    grabber.setFrameRate(30.00);


                    primaryStage.setWidth(grabber.getImageWidth());
                    primaryStage.setHeight(grabber.getImageHeight());

                    final AudioFormat audioFormat = new AudioFormat(grabber.getSampleRate(), 16, grabber.getAudioChannels(), true, true);

                    final DataLine.Info info = new DataLine.Info(SourceDataLine.class, audioFormat);
                    final SourceDataLine soundLine = (SourceDataLine) AudioSystem.getLine(info);
                    soundLine.open(audioFormat);
                    soundLine.start();

                    JavaFXFrameConverter converter = new JavaFXFrameConverter();

                    ExecutorService executor = Executors.newSingleThreadExecutor();

                    while (!Thread.interrupted()) {
                        Frame frame = grabber.grab();
                        if (frame == null) {
                            break;
                        }
                        if (frame.image != null) {
                            final Image image = converter.convert(frame);//
                            Platform.runLater(() -> {
                                
                                imageView.setImage(image);

                            });
                        }
                         else if (frame.samples != null) {
                            final ShortBuffer channelSamplesShortBuffer = (ShortBuffer) frame.samples[0];
                            channelSamplesShortBuffer.rewind();

                            final ByteBuffer outBuffer = ByteBuffer.allocate(channelSamplesShortBuffer.capacity() * 2);

                            for (int i = 0; i < channelSamplesShortBuffer.capacity(); i++) {
                                short val = channelSamplesShortBuffer.get(i);
                                outBuffer.putShort(val);
                            }

                            try {



                                executor.execute(() -> {
                                    soundLine.write(outBuffer.array(), 0, outBuffer.capacity());
                                    outBuffer.clear();
                                });
                            } catch (Exception interruptedException) {
                                Thread.currentThread().interrupt();
                            }
                        }

                    }
                    executor.shutdownNow();
                    executor.awaitTermination(10, TimeUnit.SECONDS);

                    soundLine.stop();
                    grabber.stop();
                    grabber.release();
                    Platform.exit();
                } catch (Exception exception) {
                    LOG.log(Level.SEVERE, null, exception);
                    System.exit(1);
                }
            }
        });
        playThread.start();
    }