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• How can I play audio file(.mp3, .flac, .wav) and then loop over it (mix every few seconds) another audio file(wav) using ffmpeg

  11 mars 2019, par lukistar

  I got two different commands.

  ffmpeg -i input.mp3 -i second.mp3 -filter_complex "[0:a]atrim=end=10,asetpts=N/SR/TB[begin];[0:a]atrim=start=10,asetpts=N/SR/TB[end];[begin][1:a][end]concat=n=3:v=0:a=1[a]" -map "[a]" output

  This command inserts second.mp3 into input.mp3. It seems to always keep the parameters of input.mp3. It inserts it in exact 10 seconds of input.mp3.

  Here is the second command :

  ffmpeg -i input.mp3 -i second.mp3 -filter_complex "[1:a]adelay=10000|10000[1a];[0:a][1a]amix=duration:first" output

  This command is closer to my final goal. It plays input.mp3 and in exact 10 seconds it plays along second.mp3 without stopping input.mp3’s sound.(I think that’s called mixing ?)

  My final goal is to create final.mp3.

  Its duration must always equal input.mp3 duration. It must keep the samplerate, the count of channels, etc of input.mp3

  When playing final.mp3, it must play the whole input.mp3.
  But each 10-15 seconds, it must play second.mp3 without stopping input.mp3.(mix)
  It could be said that I must use "Second command" but in a loop.
  It would be great if there is one-line command for that in ffmpeg.
  I am working with flac, mp3 and wav and both of the commands were suitable for that.

  For example :

  input.mp3 could be 40 seconds long.

  second.mp3 could be 2 seconds long.

  When I play final.mp3 it will be 40 seconds long, but each 10-15 seconds(on random) it will play second.mp3 at the same time as input.mp3.

  Sadly I have no experience with ffmpeg, both of the commands I got are answers to questions here in stackoverflow. Hope somebody can help me. Thank you !

• 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();
    }


  


• 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 ?