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• 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 ?

  


• 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

  


• Remove error when running ffmpeg in Windows script to shrink MP3 file

  19 octobre 2022, par K7AAY

  I use a script to downsize audiobook files.
  
The original audiobook file was concatenated from multiple MP3 files into one MP3 file.
  
The script (in Windows) relies on ffmpeg (version git-2020-06-26-7447045) and contains

  


  FOR %%A IN (dir *.mp3) DO ffmpeg -i "%%A" -c:a libmp3lame -q:a 8 "_%%A"


  


  However, this error message appears :

  


  


  deprecated pixel format used, make sure you did set range correctly
  
[mp3 @ 000001f026d56400] Frame rate very high for a muxer not efficiently supporting it.
  
Please consider specifying a lower framerate, a different muxer or -vsync 2

  


  


  How do I modify the script for greater efficiency and remove that error message ?