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• Android built in Camera encoder VS FFMPEG --- Speed

  3 novembre 2015, par user3903275

  How does recording a 1080P, H264 encoded video in android camera application is realtime fast but encoding a video in android using FFMPEG is slow at the same video size ?

  I know FFMPEG is a software level encoder and it wont support any hardware features.

  I know camera applications directly get buffer data from camera driver.

  But actually where the difference happens ??

  Why camera application is Realtime fast ???

  Does it use GPU and OpenGL features of the phone to encode the video so that its so realtime fast ??

  Because both Camera Application and FFMPEG runs on same mobile but still camera encodes H264 realtime ???

• Is there any way to make image compression and saving faster on Android ?

  24 octobre 2016, par Arsen Sench

  The situation

  I should show 200-350 frames animation in my application. Images have 500x300ish resolution. If user wants to share animation, i have to convert it to Video. For convertion i am using ffmpeg command.

  ffmpeg -y -r 1 -i /sdcard/videokit/pic00%d.jpg -i /sdcard/videokit/in.mp3 -strict experimental -ar 44100 -ac 2 -ab 256k -b 2097152 -ar 22050 -vcodec mpeg4 -b 2097152 -s 320x240 /sdcard/videokit/out.mp4

  To convert images to video ffmpeg wants actual files not Bitmap or byte[].

  Problem

  Compressing bitmaps to image files taking to much time. 210 image convertion takes about 1 minute to finish on average device(HTC ONE m7). Converting image files to mp4 takes about 15 seconds on the same device. All together user have to wait about 1.5 minutes.

  What i have tried

  1. I changed comrpession format form PNG to JPEG(1.5 minute result is
     achieved with JPEG compression(quality=80),with PNG it takes about
     2-2.5 minutes) success
  2. Tried to find how pass byte[] or bitmap to ffmpeg - no succes.

  QUESTION

  1. Is there any way(library (even native)) to make saving process faster.
  2. Is there any way to pass byte[] or Bitmap objects (i mean png file decompressed to Android Bitmap Class Object) to ffmpeg library video creating method
  3. Is there any other working library which will create mp4(or any supported format(supported by main Social Networks)) from byte[] or Bitmap objects in about 30 seconds(for 200 frames).

• How to convert mp4 to mp3 in Android Java ?

  16 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 works so far. Please help me on this. Thank you.