Removing the background from a video takes a long time to finish

[Ali-cryptoo]

Hi, I hope you're doing well, I'm trying to remove the background from a video, right now I'm following those steps :

1 - Extract all frames from video using FFMPEG

2 - Remove the background from each frame using Huawei ML Image Segmentation and save the bitmap as file to use it later :

    public void analyzer(List<File> files, MLCallBack mlCallBack) {
        for (File file : files) {
            Bitmap frame = ImageUtils.getBitmap(file);
            MLFrame mlFrame = MLFrame.fromBitmap(frame);
            SparseArray<MLImageSegmentation> task = this.analyzer.analyseFrame(mlFrame);
            String noBgFramePath = FileHelper.createImageInNoBackgroundFramesFolder(counter);
            ImageUtils.save(task.get(0).getForeground(), noBgFramePath, Bitmap.CompressFormat.PNG, 60, true);
            mlCallBack.onMLProgress(counter);
            BitmapUtil.recycle(frame);
            FileUtils.delete(file);
            counter++;
        }
        if (counter == files.size())
            mlCallBack.onMLCompleted(true);
    }

3 - Combine all frames (no background) into one video file.

THE ISSUE :

The step 2 (Removing background) takes a long time e.g. video with 26sec takes almost 5min to process, is there any better and faster way to do this, such as using LensEngine or something like that?