问使用ffmpeg将视频转换为Gif android工作室

EN

compile 'com.writingminds:FFmpegAndroid:0.3.2'

 Intent intent = new Intent(Intent.ACTION_PICK);
            intent.setType("video/*");
            intent.setAction(Intent.ACTION_GET_CONTENT);
            startActivityForResult(Intent.createChooser(intent, "Select Video"), PICK_CONTACT_REQUEST);

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    // Check which request we're responding to
    if (requestCode == PICK_CONTACT_REQUEST) {
        // Make sure the request was successful
        if (resultCode == RESULT_OK) {
            Uri selectedImageUri = data.getData();

            // OI FILE Manager
            String filemanagerstring = selectedImageUri.getPath();


            // MEDIA GALLERY

            String selectedImagePath =getPath(selectedImageUri);
            if (selectedImagePath != null) {
                String[] cmd = {"-i"
                        , selectedImagePath
                        , "Image.gif"};
                conversion(cmd);

            }
        }
    }
}

 public String getPath(Uri uri) {
    String[] projection = {MediaStore.Images.Media.DATA};
    Cursor cursor = managedQuery(uri, projection, null, null, null);
    if (cursor != null) {
        // HERE YOU WILL GET A NULLPOINTER IF CURSOR IS NULL
        // THIS CAN BE, IF YOU USED OI FILE MANAGER FOR PICKING THE MEDIA
        int column_index = cursor
                .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        cursor.moveToFirst();
        return cursor.getString(column_index);
    } else
        return null;
}

 public static void conversion(String[] cmd) {
    FFmpeg ffmpeg = FFmpeg.getInstance(this);

    try {


        // to execute "ffmpeg -version" command you just need to pass "-version"
        ffmpeg.execute(cmd, new ExecuteBinaryResponseHandler() {

            @Override
            public void onStart() {
            }

            @Override
            public void onProgress(String message) {
            }

            @Override
            public void onFailure(String message) {
            }

            @Override
            public void onSuccess(String message) {
            }

            @Override
            public void onFinish() {
            }
        });
    } catch (FFmpegCommandAlreadyRunningException e) {
        // Handle if FFmpeg is already running
        e.printStackTrace();
    }
}