I have a recorded MP4 from a camera mounted on a robot roaming around the field, and I want to run it into grip, so we can experiment at a desktop.
I have been able to extract frames from the MP4 and run them through GRIP, but I would like to run the video through.
I am trying to use VLC to stream it out so that I can pick it up as an “IP Camera” in GRIP:
"c:\Program Files\VideoLAN\VLC\vlc.exe" 20220124.mp4 --sout "#transcode{vcodec=MJPG,vb=800,scale=Auto,acodec=none,scodec=none}:duplicate{dst=http{mux=ts,dst=:8080/},dst=display}"
but I can’t get GRIP to connect to VLC:
edu.wpi.grip.core.sources.GrabberService$GrabberServiceException: [IP Camera localhost] Failed to start
at edu.wpi.grip.core.sources.GrabberService.startUp(GrabberService.java:54)
at com.google.common.util.concurrent.AbstractExecutionThreadService$1$2.run(AbstractExecutionThreadService.java:60)
at com.google.common.util.concurrent.Callables$4.run(Callables.java:122)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.bytedeco.javacv.FrameGrabber$Exception: Connection refused: connect
at edu.wpi.grip.core.sources.IPCameraFrameGrabber.start(IPCameraFrameGrabber.java:102)
at edu.wpi.grip.core.sources.GrabberService.startUp(GrabberService.java:52)
... 3 more
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:211)
at sun.net.www.http.HttpClient.New(HttpClient.java:308)
at sun.net.www.http.HttpClient.New(HttpClient.java:326)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1169)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1105)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:999)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:933)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1513)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1441)
at edu.wpi.grip.core.sources.IPCameraFrameGrabber.start(IPCameraFrameGrabber.java:99)
... 4 more
This is puzzling, because I can connect to http://localhost:8080/ with a browser or VLC.
Has anyone else been able to stream an existing video file into GRIP?