OnStreamInfo event is not triggered for AxisMediaControl

[philipp-student]

I'm developing a .NET Forms application using an AxisMediaControl from the Axis Media Control SDK x64 version 7.5.2 in VS2022 to display an AXIS camera stream. The stream itself starts and is displayed without any issues. When e.g. subscribing to the control's OnNewImage event, it is triggered for each new frame without any issues as well. But this is not the case for the control's OnStreamInfo event which I want to use in order to calculate a latency. As stated in the API reference that can be found in the docs, the property EnableStreamInfo needs to be set to true in order for the OnStreamInfo event to be triggered. I actually set this property to true, but the event is still not triggered.

I suppose that the OnStreamInfo event's functionality is not yet implemented, does simply not work or maybe is deprecated as the event's entry in the API reference is marked with a red cross. If anyone should know that it's not implemented yet, will it be implemented any time soon? If it does not work or is deprecated, is there another way to retrieve each frame's timestamp?

Thanks in advance for your help.

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[vivekatoffice]

Hi @philipp-student ,
I just tried with Version 7.51 and it is working for me 😄

[vivekatoffice]

And what about the reference to the AMC SDK in your application? Did you add it using the "Add Reference..." in the project's context menu or did you only add the AMC control in your toolbox by selecting "Choose Items..." and subsequently xelecting the AMC SDK in the "COM Components" tab?

Just downloaded the SDK and after installing the SDK added the changes.

[philipp-student]

Would you be so kind and try it using version 7.5.2 of the AMC SDK?

[philipp-student]

I just discovered that there is a sample solution including a sample that is similar to my application. I opened this sample and subscribed to the event and voilá, the event is now triggered. I'll compare both my and the sample's project configuration as well as the setup of the stream Hopefully I'll find a difference that caused my problem.

[philipp-student]

I figured it out. The problem lies within the type of the configured stream. The event is not triggered when configuring an MJPEG stream. However, if I specify an H264 stream, the event will be triggered.

For clarification: If I configure the MediaURL as http://<ip-address>/axis-cgi/mjpg/video.cgi?camera=quad, the event will not be triggered. However, if I change it to axrtsphttp://<ip-address>/axis-media/media.amp?videocodec=h264&camera=quad, it works and the event will be triggered.

I don't really know about the exact specifications of the H264 codec but I would assume that it includes a frame timestamp while a simple MJPEG stream does not include one.

Purely out of interest, what type of stream did you use, @vivekatoffice?

[vivekatoffice]

Great 🎆 . I am using "h264".

[philipp-student]

Do you experience any issues with the h264 stream? Since I changed the stream type from mjpeg to any other like h264 or jpeg, I get an exception at least 50% of the time as soon as the window containing the AMC is made visible respectively is drawn. I still don't get and also didn't get any exceptions before when I used mjpeg.

[vivekatoffice]

Hi @philipp-student ,
Not sure about this. Better to create a new discussion in Axis Windows SDKs category