Generating HLS files from an RTSP stream

[brinkmeister]

Hi everyone!
I've created a (JAVA) SpringBoot application that records live RTSP streams to HLS and after some initial struggles it works fine now but I have one feature I'd like to add to it but I cannot figure out how to do (or if it's even possible).

The goal is to create HLS files with one index file and .ts-files that are each around 2 seconds.
I would however like to "know" each time a new .ts file is created (without "watching" the directory in an other thread).
So some way to trigger a callback or something everytime one .ts file is "closed" and another has been started.

Do anyone here know if I can get FrameRecorder to do that for me?
(also, if you have any suggestions on how I could improve the code snippet I've included below I'd be thrilled hear them)

Simplified JAVA code:

grabber = new FFmpegFrameGrabber(rtspUrl);
grabber.setVideoCodec(AV_CODEC_ID_H265);
grabber.setPixelFormat(AV_PIX_FMT_YUV420P);
grabber.setAudioCodec(AV_CODEC_ID_AAC);
grabber.start();
try (final FFmpegFrameRecorder recorder = new FFmpegFrameRecorder(
	file,
	grabber.getImageWidth(),
	grabber.getImageHeight()
)) {
	recorder.setOption("hls_time", String.valueOf(hlsSegmentLength));
	recorder.setOption("hls_list_size", "0");
	recorder.setOption("hls_base_url", streamId + "/");
	recorder.setOption("-hls_allow_cache", "0");
	recorder.setGopSize(hlsSegmentLength * 25);
	recorder.setPixelFormat(AV_PIX_FMT_YUV420P);
	recorder.setAudioChannels(grabber.getAudioChannels());
	recorder.start();
	Frame frame;
	final Instant endTime = Instant.now().plusSeconds(maxlengthSeconds);
	while ((frame = grabber.grab()) != null && Instant.now().isBefore(endTime)) {
		if (stopRequested) {
			break;
		}
		recorder.record(frame);
	}
	recorder.stop();
} catch (Exception e) {
	log.error("Error with FFmpegFrameRecorder", e);
}
grabber.stop();