thank you for your detailed explanations and for your offer to help me. I think the best solution will be nvivafilter, as you suggested. I will first read up and then like to come back to your offer.
R-Pi4 with Ubuntu 18 has the same issue.
@ Nvidia, the best solution would be nv-alpha.
We will review the request of nv-alpha implementation. Thanks.
Thank you very much!
i actually discovered the same bug.
i am glad that wisi-tespilot described it here with all details and suggested fixing by developers.
i would love to get a notice here it here is any progress.
so i subscribed to the forum and this thread, hoping it is still alive…
—not to forget: credits for the workaround for Honey_Patouceul
I have programmed it with Python3 and Opencv. Finally it is easier to select the colour in the hsv colour space than in the rgb colour space of gstreamer.
hsv = cv2.cvtColor(vishd, cv2.COLOR_BGR2HSV) grasmaske = cv2.inRange(hsv, (30,20,0), (75,255,255)) inv_grasmaske = cv2.bitwise_not(grasmaske)
Thank you for your effort to make alpha plugin works.
I have the same issue.
So, I look into commit log of GitHub - GStreamer/gst-plugins-good: 'Good' GStreamer plugins and helper libraries.
After I modified as the commit below.
It’s working better.
I hope it helps.
Author: Doug Nazar firstname.lastname@example.org 2019-09-09 09:43:17
Committer: Doug Nazar email@example.com 2019-09-09 13:51:53
Parent: 0a6a62aa7652f0b5a689d4cecbc031b763c2000a (docs: Port all docstring to gtk-doc markdown)
Child: 37c619f9954045602a61daf4bceff4cd0e4f70cf (plugins: Use gst_type_mark_as_plugin_api() for all non-element plugin types)
Branches: master, remotes/origin/1.18, remotes/origin/master
alpha: Fix one_over_kc calculation On arm/aarch64, converting from float directly to unsigned int uses a different opcode and negative numbers result in 0. Cast to signed int first.
----------------------------- gst/alpha/gstalpha.c -----------------------------
index 867e000…4a37b01 100644
@@ -2349,7 +2349,7 @@ gst_alpha_init_params_full (GstAlpha * alpha,
tmp = MIN (tmp, 255);
alpha->accept_angle_ctg = tmp;
tmp = 1 / (kgl);
- alpha->one_over_kc = 255 * 2 * tmp - 255;
- alpha->one_over_kc = (gint) (255 * 2 * tmp - 255);
tmp = 15 * y / kgl;
tmp = MIN (tmp, 255);
alpha->kfgy_scale = tmp;
Thank you very much for the info.
Good to know.