I downloaded an SDK from NVIDIA and I'm using Visual Studio 2015 to run the demo project files provided in the SDK.
The demo project files in the SDK worked as expected until I made some small changes in the code (If you'd like details about the changes, please see last paragraph).
After making these changes, a line in the code seems to run forever. Using the debugger I found that there's a member function in that line of code that is not returning anything and therefore the program flow is just stuck at that line. I tried stepping into this function but it's defined in a .dll file that came with the SDK.
Visual Studio tells me that the symbol file is not loaded and the PDB file cannot be found on the Microsoft Server. The debugger lets me see the disassembly code but I don't know if I can identify the problem using that.
So now I'm stuck at a line of code because the member function defined in a .dll file won't return anything and just keeps on running (I've left it running for over an hour and still it didn't return anything).
I want to identify the reason why this is happening, but I'm unable to see the source code of the member function so I have no idea what's happening inside the member function or how to debug it. Is there any way I can identify the cause of this problem? Is it possible to somehow see the source code of the member function in a way that I can understand what is going on?
More details on changes I made:
I've separated this from main body of the question because I don't see it as being very relevant but it may be useful for the answerer. The SDK stitches videos together into a single video (creating 360 view videos). The demo project works fine as long as I use the demo video files. The video files are fed into the project using command line arguments. When I feed my own video files to the demo project, that's when I face this problem, otherwise the member function returns successfully and the project successfully creates a stitched video. The only thing I changed is the input to the project (i.e. the video files), I haven't changed the source code at all.
As stated by VTT and Aganju, I cannot step into the member function defined in the DLL unless the source code is provided to me with the DLL. This answers what I asked. For my specific case, I was working with NVIDIA VRWorks 360 Video SDK, the problem was caused by not having the right codec for the video files that get stitched. Although this is mentioned nowhere in the SDK documentation, the video codec that should be used is H264 - MPEG-4 AVC (part 10) (AVC1).