如何在视频 spring 引导中滚动？

Question

I have built a dummy video streaming application in spring boot,I have noticed that i cant skip to another frame or to a certain time in a video. Here is my code to read videoFile

public byte[] getVideo() throws IOException {


        byte[] bytes = new byte[(int) file.length()];
        FileInputStream inputStream = new FileInputStream(file);
        inputStream.read(bytes);
        return bytes;
    }

and this is my what my video controller returns

return ResponseEntity.status(HttpStatus.OK)
                .header("Content-Type","video/mp4")
                .header("Content-length",String.valueOf(streamingService.file.length()))
                .body(streamingService.getVideo());

note i am not using any frontend

Answer 1

So after little bit of extermination i found the reason for it was the browser(chrome) made another get request to certain byte range.and my getVideo() was not well written to accept the byte range and give back the required byte range.

After rewritting my videoStreamingService the problem was solved for chrome

here is my rewitten code for getVideo()

byte[] data;
        Long fileSize = file.length();
        String[] ranges = range.split("-");
        rangeStart = Long.parseLong(ranges[0].substring(6));
        if (ranges.length > 1) {
            rangeEnd = Long.parseLong(ranges[1]);
        } else {
            rangeEnd = fileSize - 1;
        }
        if (fileSize < rangeEnd) {
            rangeEnd = fileSize - 1;
        }
        contentLength = String.valueOf((rangeEnd - rangeStart) + 1);
       data = readByteRange( rangeStart, rangeEnd);
       return  data;

readRangeByte() method so i can read data appropriately

public byte[] readByteRange(long start, long end) throws IOException {
        try (InputStream inputStream = (Files.newInputStream(Path.of(videoFileName)));
             ByteArrayOutputStream bufferedOutputStream = new ByteArrayOutputStream()) {
            byte[] data = new byte[128];
            int nRead;
            while ((nRead = inputStream.read(data, 0, data.length)) != -1) {
                bufferedOutputStream.write(data, 0, nRead);
            }
            bufferedOutputStream.flush();
            byte[] result = new byte[(int) (end - start) + 1];
            System.arraycopy(bufferedOutputStream.toByteArray(), (int) start, result, 0, result.length);
            return result;
        }
    }

and my controller class code

public  ResponseEntity<byte[]> video(@RequestHeader(value = "Range",required = false)String range) throws IOException {
        if (range == null) {
            return ResponseEntity.status(HttpStatus.OK)
                    .header("Content-Type", "video/mp4")
                    .header("Content-Length", String.valueOf(streamingService.file.length()))
                    .body(streamingService.readByteRange(streamingService.getRangeStart(),streamingService.file.length()-1));
        }
        byte[] data = streamingService.getVideo(range);

        return  ResponseEntity.status(HttpStatus.PARTIAL_CONTENT)
                .header("Content-Type", "video/mp4")
                .header("Accept-Ranges", "bytes")
                .header("Content-Length", streamingService.getContentLength())
                .header("Content-Range", "bytes" + " " + streamingService.getRangeStart() + "-" + streamingService.getRangeEnd() + "/" + streamingService.file.length())
                .body(data);

After @Andreas suggestion the code works very well with both the browsers