Copy input stream using FfmpegFrameGrabber/-Recorder

[brinkmeister]

Hi

I'm trying to save a RTSP (live) stream to HLS but I cannot figure out how to do it without recoding the stream. There's two issues with that: firstly, the saved stream cannot be of lower quality than the source stream and secondly I want to minimize the cpu load on the server since I might have 1-10 of these "RTSP-to-HLS" threads running simultaneously.

I think I can accomplish the copy-thingy with recorder.recordPacket and create the index.m3u8 file myself using byte-ranges for the segment instead of actually splitting the file, but then I need to know when I've recorded a complete frame, that it is a key frame and I need to know how many bytes I've recorded by then. This is so that each segment can start with a key frame.

Does anyone here have any input on how I could accomplish this?

[saudet]

We can easily accomplish this with the ffmpeg program:
http://bytedeco.org/javacpp-presets/ffmpeg/apidocs/org/bytedeco/ffmpeg/ffmpeg.html

[saudet]

Or maybe not? I'm not sure I understand your question

[brinkmeister]

That looks really promising, I didn't even know you could access the ffmpeg program directly! I think I can make that work, I just need to hold the process in a separate thread and send a "q" to the process so that ffmpeg closes the stream when I need it to.

Thanks a lot, I'll post another comment if I figure it out!