LibVlcSharp: How to stream a dynamic frame sequence with RTSP (Dynamic StreamMediaInput)?
Posted: 30 Aug 2021 15:02
I'm working on a project that takes individual images from an RTSP-Stream and manipulates them (drawing bounding boxes). Those images should be restreamed (h264 encoded) on a separate RTSP-stream on an other address and shouldn't be saved on the local disk.
My current code so far is:
It is a little bit messy, because of testing purposes, but it works if I just use the given RTSP-Stream as the Media instead of the fetched images. I have some success with piping the images (as bytes) into the cvlc command line (), but it should be integrated in c#. get_images.py just reads images in a while-loop, writes a string on it and forwards them into std-out.
My thoughts on solving this problem is, to input the images via the StreamMediaInput-class and to dynamically change the media, if a new image has been retrieved. But it doesn't work, nothing can be seen with VLC or FFPlay.
Does someone has faced a similar Problem? How can the StreamMediaInput-Object can be changed dynamically, such that new images are broadcastet correctly?
Thank you for taking the time to read this post. Have a nice day!
My current code so far is:
Code: Select all
{
// OpenCV VideoCapture: Sample RTSP-Stream
var capture = new VideoCapture("rtsp://195.200.199.8/mpeg4/media.amp");
capture.Set(VideoCaptureProperties.FourCC, FourCC.FromFourChars('M', 'P', 'G', '4'));
var mat = new Mat();
// LibVlcSharpStreamer
Core.Initialize();
var libvlc = new LibVLC();
var player = new MediaPlayer(libvlc);
player.Play();
while (true)
{
if (capture.Grab())
{
mat = capture.RetrieveMat();
// Do some manipulation in here
var media = new Media(libvlc, new StreamMediaInput(mat.ToMemoryStream(".jpg")));
media.AddOption(":no-audio");
media.AddOption(":sout=#transcode{vcodec=h264,fps=10,vb=1024,acodec=none}:rtp{mux=ts,sdp=rtsp://192.168.xxx.xxx:554/video}");
media.AddOption(":sout-keep");
player.Media = media;
// Display screen
Cv2.ImShow("image", mat);
Cv2.WaitKey(1);
}
}
}
Code: Select all
python get_images.py | cvlc -v --demux=rawvideo --rawvid-fps=25 --rawvid-chroma=RV24 --sout '#transcode{vcodec=h264,fps=25,vb=1024,acodec=none}:rtp{sdp="rtsp://:554/video"}'My thoughts on solving this problem is, to input the images via the StreamMediaInput-class and to dynamically change the media, if a new image has been retrieved. But it doesn't work, nothing can be seen with VLC or FFPlay.
Does someone has faced a similar Problem? How can the StreamMediaInput-Object can be changed dynamically, such that new images are broadcastet correctly?
Thank you for taking the time to read this post. Have a nice day!