我正在通过spring@restcontroller下载一个文件，返回responseentity对象输出流中的视频字节。

@GetMapping(value = "/video/{id}/data")
    @ResponseBody
    public ResponseEntity<OutputStream> getVideoData(@PathVariable("id") Long id, HttpServletResponse response) {
        try {
            for (Video video : videos) {
                if (id == video.getId()) {
                    if (videoDataMgr == null) {
                        videoDataMgr = VideoFileManager.get();
                    }
                    videoDataMgr.copyVideoData(video, response.getOutputStream());
                    return new ResponseEntity<OutputStream>(response.getOutputStream(), HttpStatus.OK);
                }
            }
            response.sendError(HttpServletResponse.SC_NOT_FOUND);
        } catch (IOException ioe) {
            logger.log (Level.WARNING, ioe.toString());
        }
        return null;
    }

如果我播放正在播放的视频和下载的视频，它们都显示相同的内容。但是，当逐字节比较2 mp4文件的内容时，以下测试失败：

@Test
    public void testAddVideoData() throws Exception {
        Video received = videoSvc.addVideo(video);
        VideoStatus status = videoSvc.setVideoData(received.getId(),
                new TypedFile(received.getContentType(), testVideoData));
        assertEquals(VideoState.READY, status.getState());

        Response response = videoSvc.getData(received.getId());
        assertEquals(200, response.getStatus());

        InputStream videoData = response.getBody().in();
        byte[] originalFile = IOUtils.toByteArray(new FileInputStream(testVideoData));
        byte[] retrievedFile = IOUtils.toByteArray(videoData);
        assertTrue(Arrays.equals(originalFile, retrievedFile));
    }

在对文件进行比较时，我可以看到除了结尾的一些字符（下载文件的内容在右侧），视频几乎是相同的：

{“ready”：false}从何而来？