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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

  


• ffmpeg hangs during download on network lags

  30 juin 2016, par VladimirLenin

  ffmpeg hangs infinitely when cutting off wifi while downloading m3u8 (which goes through http actually). Same happens occasionaly when trying to download multiple files from script probably due to network lags. Tried -tiemout option but with no avail.

  ffmpeg -y -i 'http://c.brightcove.com/services/mobile/streaming/index/rendition.m3u8?assetId=5005890079001&videoId=5005830251001' -c copy -f mp4 -bsf:a aac_adtstoasc 'file:/home/serj/.mirror0/OUT_DATA2/www.watoday.com.au/title-page/Sydney v Western Bulldogs: Scoring woes could cost Swans, Dogs a flag/00001-FootyFix - Can the Doggies upset the Swans again.mp4' -timeout 1000000

• Wowza RTMP to RTSP

  3 août 2016, par Nmas

  We’re using a Raspicam to stream live video to a client using Wowza Streaming Engine. We use FFMPEG to encode and send to Wowza and we can succesfully watch the RTMP stream using JWPlayer. This is the FFMPEG command used :

  ffmpeg -t 0 -s 320x240 -f video4linux2 -i /dev/video0 -b:v 250k -tune zerolatency -preset ultrafast -f flv -r 15 rtmp://wowzaaddress:1935/live/live

  To be able to watch the stream on mobile devices we want to use RTSP or HLS which Wowza provides links to, however when we use those links (provided on the Test Player) nothing happens and we can’t even open them to test for example in VLC. We have already added the extra ports on our web server to see if that was the problem and still didn’t work.
  Does anybody know what the problem is or what could we be doing wrong ?