trying to send image via NDI but getting weird results

hi all

first off, i'm no python expert. so this code is hacked together.

its basically semi working, but from the screenshot u can see the colour is weird and there's weird banding

the code is taken from the Spektacular SDK examples mapping_ar.py

here's the relevant function: (sorry, the couldn't get the code formatting to work properly, so had to manualy do it)

<code>

def handleVioOutput(state, cameraPose, t, img, width, height, video_frame, ndi_send):

    if state.shouldQuit:

        ndi.send_destroy(ndi_send)

        ndi.destroy()  

        return

    if not state.displayInitialized:       

state.displayInitialized = True

targetWidth = 640       

targetHeight = 360       

state.scale = min(targetWidth / width, targetHeight / height)       

state.adjustedResolution = [int(state.scale * width), int(state.scale * height)]       

init_display(state.adjustedResolution[0], state.adjustedResolution[1])       

print(state.adjustedResolution[0], state.adjustedResolution[1])       

state.meshRenderer = MeshRenderer()       

state.pointCloudRenderer = PointCloudRenderer(state.args.pointCloudDensity)       

if state.mesh:           

state.meshRenderer.setMesh(state.mesh)
    for event in pygame.event.get():       

if event.type == pygame.QUIT:           

state.shouldQuit = True       

if event.type == pygame.KEYDOWN:           

if event.key == pygame.K_q: state.shouldQuit = True           

if event.key == pygame.K_x:

state.args.pointCloud = not state.args.pointCloud           

if event.key == pygame.K_m:               

if state.meshRenderer:

state.meshRenderer.nextMode()               

if state.pointCloudRenderer:

state.pointCloudRenderer.nextMode()       

if state.shouldQuit:           

pygame.quit()           

return

    glPixelZoom(state.scale, state.scale)    glDrawPixels(width, height, GL_RGB, GL_UNSIGNED_BYTE, img.data)
    updateRenderer(state, cameraPose, t)       

pixel_data = np.zeros((state.adjustedResolution[1], state.adjustedResolution[0], 3), dtype=np.uint8)
    img = glReadPixels(0, 0, state.adjustedResolution[0], state.adjustedResolution[1], GL_RGB, GL_UNSIGNED_BYTE, pixel_data)
    #img_bgr = cv.cvtColor(img, cv.COLOR_RGB2BGR)
    video_frame.data = img    video_frame.FourCC = ndi.FOURCC_VIDEO_TYPE_BGRX
    ndi.send_send_video_v2(ndi_send, video_frame)
   

if state.currentMapperOutput:       

state.lastMapperOutput = state.currentMapperOutput
    if state.args.recordPath:       

try: os.makedirs(os.path.dirname(state.args.recordPath))        except: pass
        if os.name == 'nt':           

ffmpegStdErrToNull = "2>NUL"       

else:           

ffmpegStdErrToNull = "2>/dev/null"
        r = state.adjustedResolution       

if state.recordPipe is None:           

cmd = "ffmpeg -y -f rawvideo -vcodec rawvideo -pix_fmt rgb24 -s {}x{} -i - -an -pix_fmt yuv420p -c:v libx264 -vf vflip -crf 17 \"{}\" {}".format(                r[0], r[1], state.args.recordPath, ffmpegStdErrToNull)           

state.recordPipe = subprocess.Popen(                cmd, stdin=subprocess.PIPE, shell=True)       

buffer = glReadPixels(0, 0, r[0], r[1], GL_RGB, GL_UNSIGNED_BYTE)       

state.recordPipe.stdin.write(buffer)
    pygame.display.flip()

</code>