Question Possible memory leak when streaming video to texture?

Howdy -

Cross-posting this with `General Graphics` as I don't know a good home for my question..

I'm trying to livestream video to a texture, and, it works, but after some time Unity hung and I got a low disk warning (atm I have 15GB free). After I killed Unity, the disk freed back up. This leads me to believe there is a memory leak somewhere in my code or pipeline, which led to a disk swap catastrophe.

My pipeline is as follows: sending a 480p/30fps jpg-compressed camera stream through ROS (ROS-TCP connector). This callback runs on every frame coming in:

Code (CSharp):

1.     public void c_img_cb(CompressedImageMsg img) {
2.         //Debug.Log(img);
3.         Texture2D texRos = new Texture2D(640, 480, TextureFormat.RGB24, false);
4.         texRos.LoadImage(img.data);
5.         obj.GetComponent<Renderer>().material.mainTexture = texRos;      
6.     }

Any help would be much appreciated!

 

Are you running this code every frame?
Asset types like Texture2D are unmanaged, you need to Destroy() them when no longer used.
As I read your code now you are creating a new texture every frame that never gets unloaded.
You should really only need one and reuse it.

 

Awesome - thank you!!

Just curious - Are there managed assets in Unity? Why doesn't texRos fall out of scope after the function runs (and thus get picked up by the garbage collector)?

 

Not as far as I know.
I'm sure it's explained in the manual somewhere, I just can't seem to find where right now.
The assets, like materials, meshes and textures, live on the C++ side of the engine and the C# objects just point to them. So the C# objects might go out of scope, but the C++ side does not.
I'm surely missing details here but this is how I understand it to work.