android - 将视频文件转换为 gif

Question

我一直在尝试弄清楚如何在 android 中将视频文件转换为 gif。我在网上找到了一个类，AnimatedGifEncoder 类 ( https://github.com/nbadal/android-gif-encoder/blob/master/GifEncoder.java )。但它似乎并没有真正起作用。我在 AsnycTask 中包装了视频到 gif 的转换过程。代码如下所示:

@Override
protected String doInBackground(File[] files) {
    MediaMetadataRetriever mmr = new MediaMetadataRetriever();
    try {
        mmr.setDataSource(files[0].getPath());
    } catch (Exception e){
        Log.i("VMPF", e.toString());
    }
    //int framesRate = Integer.parseInt(mmr.extractMetadata(MediaMetadataRetriever.METADATA_KEY_CAPTURE_FRAMERATE));
    int duration = Integer.parseInt(mmr.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION));
    Log.i("gifduration","" + duration);
    //Log.i("giffps","" + framesRate);
    int millisPerframe = 1000/24;
    int timeAt = 0;
    ByteArrayOutputStream bos = new ByteArrayOutputStream();
    AnimatedGifEncoder encoder = new AnimatedGifEncoder();
    encoder.setDelay(0);
    encoder.setRepeat(100);
    encoder.start(bos);
    while (timeAt < duration){
        encoder.addFrame(mmr.getFrameAtTime(timeAt));
        timeAt += millisPerframe;
        Log.i("wenfhluwhru", timeAt+"");
    }
    encoder.finish();
    Log.i("wenfhluwhru", "loop finished");
    FileOutputStream outStream = null;
    try {
        outStream = new FileOutputStream(path);
        outStream.write(bos.toByteArray());
        outStream.close();
        Log.i("wenfhluwhru", "outstream closed");
        return path;
    } catch(Exception e) {
        e.printStackTrace();
    }
    return null;
}

我的代码有问题吗(我假设 AnimatedGifEncoder 类没有问题)？我还考虑过将文件转换为 byte[] 并通过 Glide 将 byte[] 提交到 GifImageView code> 但我愿意猜测视频的 byte[] 与 gif 文件的不同(如果我错了，请告诉我)？

Answer 1

您可以在不同的时间找到帧并从中创建可绘制的动画

public void getGIF(){
    int counter = 0;
    Bitmap b = mmRetriever.getFrameAtTime(counter);
    while(counter < duration && b != null){
        frame = new BitmapDrawable(getResources(), b);
        animationDrawable.addFrame(frame, 50);
        counter += incrementor;
        b = mmRetriever.getFrameAtTime(counter);
    }
}