nocarryr / cyndilib Goto Github PK

I'm trying to run this example code from: https://gist.github.com/royshil/2abf89b8d12072cdd793ddda2b73c497 and I received the error of :

ValueError: numpy.dtype size changed, may indicate binary incompatibility. Expected 96 from C header, got 88 from PyObject

I didn't find any documentation addressing Numpy compatibility, any solution?

Excellent project - thank you!
I use it in https://github.com/occ-ai/scoresight

While python 3.12 isn't supported from PyPi I resort to building, and missing some deps before setup.py
Suggest adding

$ pip install setuptools cython numpy

to the build instructions.
Note: this is without pipenv.
Will be useful for brand new machines or a CI build.

Thanks!

UYVY format is 4 bytes per 2 pixels => 2 bytes per pixel

For video receivers, cyndilib recomputes the line-stride in the calc_fourcc_pack_info function instead of using the line-stride declared in the NDIlib_video_frame_v2_t struct.

For most resolution this works fine but some non-standard resolution add some line padding.

In practice, this causes cyndilib to consider that the data buffer is actually shorter than it really is. The get_array function of a video frame returns incomplete data and trying to display it results in a jumbled image.

Here is a screenshot of OBS sending three color bands as a 300x700 rgba image through the OBS-NDI plugin and cyndilib receiving it.

This also happens with the RecvColorFormat.UYVY_RGBA flag, which can also contain padding which cyndilb ignores.

I have a simple fix for this for which I'll open a PR soon.

Hi!, very nice library the viewer example works very fast!,

I'm wondering if you have an example on how to send NDI, that would very helpful

Many Thanks
Thomas