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• How to convert mo4 to mp3 in android java ?

  3 août 2023, par Akshit

  I have the mp4 link of a video but don't have a link for the mp3 version of that mp4 video. So is there any way that I can convert that mp4 video to mp3 in Android ? I saw some resources but nothing works for me. I have two ways in which I believe this can be achieved

  


  

  1. Convert the mp4 link to mp3 directly. ( Not Sure if this is achievable )

  


  2. Download the mp4 on the device with the help of a link and then use some code to convert that mp4 to mp3.

  


  


  I also tried some solutions which are available online

  


  https://github.com/tanersener/mobile-ffmpeg

  


  I tried the above library to achieve the final goal. But got Async command execution failed with returnCode=1. This error in the code I am using is

  


      private class Mp4ToMp3ConverterTask extends AsyncTask {

    @Override
    protected String doInBackground(String... params) {
        String mp4FilePath = params[0];
        String mp3OutputPath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/output.mp3";

        String[] ffmpegCommand = {"-i", mp4FilePath, "-vn", "-ar", "44100", "-ac", "2", "-b:a", "192k", mp3OutputPath};


        Config.enableStatisticsCallback(new StatisticsCallback() {
            public void apply(Statistics newStatistics) {
                Log.d("Dekh", String.format("frame: %d, time: %d", newStatistics.getVideoFrameNumber(), newStatistics.getTime()));
            }
        });

        long executionIdd = FFmpeg.executeAsync(ffmpegCommand, new ExecuteCallback() {

            @Override
            public void apply(final long executionId, final int returnCode) {
                if (returnCode == RETURN_CODE_SUCCESS) {
                    Log.i("Dekh", "Async command execution completed successfully.");
                } else if (returnCode == RETURN_CODE_CANCEL) {
                    Log.i("Dekh", "Async command execution cancelled by user.");
                } else {
                    Log.i("Dekh", String.format("Async command execution failed with returnCode=%d.", returnCode));
                }
            }
        });

        FFmpeg.cancel(executionIdd);

        return mp3OutputPath;
    }
}


  


  Solution number 2 which I used is

  


  https://androidprogrammatically425516919.wordpress.com/2020/04/21/how-to-convert-video-to-audio-in-android-programmatically/

  


  But I got an error here also Failed to instantiate extractor. and another error is java.io.FileNotFoundException : open failed : EISDIR (Is a directory)
I tried the online available solution to solve these errors but nothing worked. Such as granting write permission. Providing a valid location to save the output.

  


  But nothing work so far. Please help me on this. Thank you

  


• Video Keyframe and Iframe

  12 avril 2021, par SY Moon

  I have confused one thing for Video Frame extraction.

  


  I have sample.mp4 video, 15FPS.

  


  I tried extracting Keyframe with FFMPEG.

  


  ffmpeg -skip_frame nokey -i sample.mp4 -vsync 0 -frame_pts true out%d.png


  


  I get 29 Pictures and I believe I have got 29 I frames. (If I have wrong, Please correct me)

  


  Then I tried extracting specific timeline(10 sec) frame with picture

  


  ffmpeg -i sample.mp4 -ss 00:00:10 -frames:v 1 test1.png


  


  This output picture, I can not find same one among my Keyframes I get.

  


  Question : test1.png, What is frame type ? Does it one of P or B frame not I ?

  


• I am a newbie in FFmpeg and I am trying to use FFMPEG to play RTSP stream on Android, but it will play slower and slower

  8 mai 2020, par Ajax

  I am a newbie in FFmpeg and I am trying to use FFMPEG to play RTSP stream on Android, but it will play slower and slower. The picture of my player and video source will increase with the time difference. The video are not synchronized. I'm pulling on the local area network。
The longer it is played, the more the picture of the video source will be. The more it cannot automatically return to the real-time picture like MediaCode's hardware decoding.The decoded picture is in slow motion, and it will freeze after a while.。What causes this ? How can i optimize it。
this is my code

  



  2020-5-8/Problem has been solved