Open RTSP stream results in an error.

asked 2013-04-11 08:46:15 -0600

arjanhgroen
11 ●1 ●1 ●3

updated 2013-04-11 08:47:13 -0600

Hello,

I am trying to access the RTSP stream from my Bosch IP cam. I have checked if I can open the stream in ffplay and VLC. It works in both.

I receive the following error: warning: Could not find codec parameters (../../modules/highgui/src/cap_ffmpeg_impl.hpp:540). The camera is streaming with a h264 codec.

I am working in windows with a self compiled version of OpenCV 2.4.5. I also tried MPEG-4 SH++ as coded but same error message.

Does anybody have an idea what could be the error?

Code:

    CvCapture *camera = cvCreateFileCapture("rtsp://10.10.4.28");

if (camera == NULL) {
    printf("camera is null, aborting...");
    return -1;
}

IplImage *img = cvQueryFrame(camera);

cvNamedWindow( "myWindow", CV_WINDOW_AUTOSIZE );
cvShowImage( "myWindow", img );

Comments

You might also check this: http://answers.opencv.org/question/3664/ip-network-camera-access/

Rui Marques ( 2013-04-12 04:43:42 -0600 )edit

Thanks, I didn't know about that option! This would be a backup for when don't get the stream working.

arjanhgroen ( 2013-04-12 09:25:44 -0600 )edit

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answered 2013-04-11 08:57:51 -0600

StevenPuttemans

20029 ●16 ●82 ●207 http://stevenputtemans...

Please next time look at the open topics first. A same problem was solved just like 10 topics ago:

http://answers.opencv.org/question/11299/how-to-open-rtsp-videostream-from-ip-cam/

Also try first using prebuilt binaries. That way you can be sure that it is not a building problem.

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Comments

I am using 2.4.5 and still have a issue. I also tried the 2th answer in that topic.

arjanhgroen ( 2013-04-11 09:11:14 -0600 )edit

I am guessing then that your h264 codec used is not supported by ffmpeg which seems a bit weird. To be just sure. Download the latest ffmpeg version on yourself and build openCV again. Could be that there is still an older ffmpeg version inside openCV contained.

StevenPuttemans ( 2013-04-11 09:40:07 -0600 )edit

I have tried the prebuilt binaries. Same issue. I have found the ffmpeg folder in source, I will try to update the ffmpeg library tomorrow and compile OpenCV again. I will let you know

arjanhgroen ( 2013-04-11 09:49:11 -0600 )edit

I tried to include the newest FFMPEG but had some issues with building it. I am going to try to run it from a Ubuntu machine, and if that works crosscompile it. I will post a update next week

arjanhgroen ( 2013-04-12 09:26:59 -0600 )edit

I have compiled OpenCV with the most recent FFMPEG on Ubuntu, I can open the RTSP stream now. I will try to get it working on Windows and post the answer here.

arjanhgroen ( 2013-04-15 02:21:32 -0600 )edit

Nice progress =)

StevenPuttemans ( 2013-04-15 08:15:59 -0600 )edit

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Open RTSP stream results in an error.

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