The sound and picture cannot be synchronized

[redoriental]

long interval = 1_000 / 30;

            long startTime = System.currentTimeMillis();

            Frame frame;
            while ((frame = grabber.grab()) != null) {

                recorder.record(frame);
                long currentTime = 1_000 * (System.currentTimeMillis() - startTime);
                long frameTime = frame.timestamp;
                long sleepTime = (frameTime - currentTime) / 1_000;
                try {
                    if (sleepTime > 500 + interval) {
                        Thread.sleep(interval);
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }

When I use this code, I will have the problem that the sound and picture are not synchronized

[redoriental]

If I use ffmpeg.exe directly, this problem will not occur

[saudet]

Try to call setTimestamp(frame.timestamp) before record(). Please do not open duplicate issues.

[saudet]

Duplicate of #1972