Trigger FFC from Python under Windows

[sebi5361]

I am using:

• Software: Python 3.8.11
• OS: Windows 10 Pro, x64, Version 21H1
• Camera: Flir Lepton 1.6, non-shuttered, slow video 9 Hz
• USB Adapter: Pure Thermal mini (fw:v1.0.0) [0200]

After adjusting opencv-capture.py (to make it Python3 compliant) I can run it properly and see a display with the images taken from my Lepton camera.
But I need to trigger FFC manually to get an exploitable image.

My understanding is that I need to have libuvc built to do so. Is there an alternative way?

After struggling with the toolchain (I had to install pthreads, etc) I was able to generate uvc.dll.
But uvctypes.py fails with:

Traceback (most recent call last): 
  File "C:\Users\krut\Desktop\purethermal1-uvc-capture-master\python\uvctypes.py", line 214, in <module> 
    libuvc.uvc_get_format_descs.restype = POINTER(uvc_format_desc) 
  File "C:\Users\krut\Anaconda3\lib\ctypes\__init__.py", line 386, in __getattr__ 
    func = self.__getitem__(name) 
  File "C:\Users\krut\Anaconda3\lib\ctypes\__init__.py", line 391, in __getitem__ 
    func = self._FuncPtr((name_or_ordinal, self)) 
AttributeError: function 'uvc_get_format_descs' not found

I suspect it is because I kept the fields LIBUSB_INCLUDE_DIR and LIBUSB_LIBRARY_NAMES void in Cmake and that libsub was not included properly while building libuvc (uvc.dll is 11KB only).
I am surprised VS2019 didn't complain while building the library though.

So I tried pointing at the proper locations for libusb:

• LIBUSB_INCLUDE_DIR = C:/Users/krut/Desktop/libusb-1.0.24/include/libusb-1.0
• LIBUSB_LIBRARY_NAMES = C:/Users/krut/Desktop/libusb-1.0.24/VS2013/MS64/dll/libusb-1.0.dll

But I get this error message while building libuvc with VS2019:

Severity	Code	Description	Project	File	Line	Suppression State 
Error	LNK1107	invalid or corrupt file: cannot read at 0x300	uvc	C:\Users\krut\Desktop\libusb-1.0.24\VS2019\MS64\dll\libusb-1.0.dll	1

and I don't know how to fix it...

Any help would be appreciated:

• What is the easiest way to trigger FFC in Python under Windows 10?
• What is the best approach to compile libuvc under Windows? Using VS2019 or CygWin?
• Is it normal that the generated libuvc library is named uvc.dll not libuvc.dll?
• How to solve the LNK1107 error?
• Did anyone successfully compile libuvc under Windows?
• Maybe someone can share its x64 uvc.dll with me so I can try it using uvctypes.py and uvc-deviceinfo.py?
• There are three versions of libuvc: the original one from libuvc, an advanced one from pupil-labs supposed to work out of the box on Windows, and the one from groupgets. Should I stick to the one from groupgets or the others include the modifications made by groupgets at this time?

[OrestisDotplot]

Hi, I am facing the same problem, were you able to solve this ?

[EduardoRonchi]

Hello.

Any updates on this issue?

[OrestisDotplot]

Hey, I was able to build a windows app which does FFC:

Build the mediafoundation example in the repo: https://github.com/groupgets/purethermal1-uvc-capture
To build the above, install Visual Studio with Windows 10 SDK.
To build, follow the instructions here: https://github.com/Microsoft/Windows-classic-samples/tree/main/Samples/Win7Samples/multimedia/mediafoundation/MFCaptureToFile

I removed the initial few lines of the code and built an app so that when I launch the app, it calibrates lepton and the closes off.