Question

我一直在尝试找出如何在Android中将视频文件转换为gif。我在网上找到了一个班级，AnimatedGifEncoder班级（https://github.com/nbadal/android-gif-encoder/blob/master/GifEncoder.java）。但这似乎并不奏效。我将视频到gif的转换过程包装在AsnycTask中。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;
}

我的代码是否存在问题（我认为AnimatedGifEncoder类没有问题）？我也考虑过将文件转换为byte[]，然后通过byte[]将GifImageView提交到Glide中，但是我想猜测byte []视频不同于gif文件的视频（如果我记错了，请告诉我）？

Answer 1

您可以在不同的时间找到帧并创建一个可绘制的动画

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);
    }
}

Answer 2

您可以像这样使用FFMPEG将视频文件转换为gif：

在您应用的build.gradle中添加

implementation 'nl.bravobit:android-ffmpeg:1.1.7'

然后

        var name="sample"
        var inFIle = Environment
                .getExternalStoragePublicDirectory(Environment
                        .DIRECTORY_DOWNLOADS).toString() + "/${name}.mp4"

        var gifFIle = Environment
                .getExternalStoragePublicDirectory(Environment
                        .DIRECTORY_DOWNLOADS).toString() + "/${name}gif.gif"
        val cmd = arrayOf("-i", inFile, gifFIle)

        val ffmpeg = FFmpeg.getInstance(baseContext)

        ffmpeg.execute(cmd, object : ExecuteBinaryResponseHandler() {
            override fun onStart() {

            }

            override fun onProgress(message: String) {


            }

            override fun onFailure(message: String) {

            }

            override fun onSuccess(message: String) {

            }

            override fun onFinish() {


            }
        })

将视频文件转换为gif

2 个答案: