@Override
        public File call() throws Exception {

            final File res = new File(Minecraft.getMinecraft().mcDataDir, "screenshots/test.gif").getCanonicalFile();

            try {

                final AnimatedGIFWriter writer = new AnimatedGIFWriter(true);
                final FileOutputStream os = new FileOutputStream(res);

                try {
                    writer.prepareForWrite(os, -1, -1);

                    float percPerFrame = 1.0f / frames.size();

                    for (int[] frame : frames) {
                        BufferedImage bufferedimage = null;

                        if (OpenGlHelper.isFramebufferEnabled()) {
                            bufferedimage = new BufferedImage(buffer.framebufferWidth, buffer.framebufferHeight, 1);
                            int j = buffer.framebufferTextureHeight - buffer.framebufferHeight;

                            for (int k = j; k < buffer.framebufferTextureHeight; ++k) {
                                for (int l = 0; l < buffer.framebufferWidth; ++l) {
                                    bufferedimage.setRGB(l, k - j, frame[k * buffer.framebufferTextureWidth + l]);
                                }
                            }
                        } else {
                            bufferedimage = new BufferedImage(width, height, 1);
                            bufferedimage.setRGB(0, 0, width, height, frame, 0, width);
                        }

                        float scale;
                        if (width > height) {
                            scale = 500.0f / width;
                        } else {
                            scale = 500.0f / height;
                        }
                        if (scale < 1) {
                            int w = (int) (width * scale);
                            int h = (int) (height * scale);
                            BufferedImage resizedImg = new BufferedImage(w, h, bufferedimage.getType());
                            Graphics2D g2 = resizedImg.createGraphics();
                            g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
                            g2.drawImage(bufferedimage, 0, 0, w, h, null);
                            g2.dispose();
                            bufferedimage = resizedImg;
                        }

                        writer.writeFrame(os, bufferedimage, 30);
                        percentComplete = Math.min(1, percentComplete + percPerFrame);
                    }

                    writer.finishWrite(os);
                } catch (Exception e) {
                    CTBMod.logger.error("Error writing gif.", e);
                    return null;
                } finally {
                    IOUtils.closeQuietly(os);
                }

            } catch (FileNotFoundException e) {
                CTBMod.logger.error("Could not create gif file.", e);
                return null;
            } finally {
                frames.clear();
            }

            return res;
        }
    }