changed order of cap in order to work with jetson orin

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Change is necessary for opencv 4.9.x to work on the Jetson Orin devices with streams

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Thank you for your feedback, the problem I solve with this is that I need the BGR format in my App. The standard caps used by opencv are {BGR, GRAY8} on the Jetson BGR (and all 3 byte formats) are not working, so GRAY8 is chosen. On the Jetson you need 4 byte formats like BGRx. The problem I tried to solve is that GRAY8 was in your code before BGRx , so it always connected GRAY8 first, instead I want it to choose BGRx first, and actually I don’t care about GRAY8.

So I need this change for my caps to work and if from your point of view it does not change your logic then I strongly suggest to keep my changes. By the way your standard pipelines are also not working on the Jetson ;-).

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Am 07.05.2024 um 17:51 schrieb Alexander Smorkalov @.***>:

@asmorkalov requested changes on this pull request.

---

In modules/videoio/src/cap_gstreamer.cpphttps://github.com/opencv/opencv/pull/25557#discussion_r1592712955:

• else if (format == "GRAY8")
• {
• CV_CheckEQ((int)n_planes, 1, "");
• size_t step = GST_VIDEO_FRAME_PLANE_STRIDE(&frame, 0);
• CV_CheckGE(step, (size_t)frame_width, "");
• Mat src(sz, CV_8UC1, GST_VIDEO_FRAME_PLANE_DATA(&frame, 0), step);
• src.copyTo(dst);
• return true;
• }
• else if (format == "GRAY16_LE" || format == "GRAY16_BE")
• {
• CV_CheckEQ((int)n_planes, 1, "");
• size_t step = GST_VIDEO_FRAME_PLANE_STRIDE(&frame, 0);
• CV_CheckGE(step, (size_t)frame_width, "");
• Mat src(sz, CV_16UC1, GST_VIDEO_FRAME_PLANE_DATA(&frame, 0), step);
• src.copyTo(dst);
• return true;
• }

format is std::string. The order change in if-else-if-else chain does not change logic. I propose to revert it.

---

In modules/videoio/src/cap_gstreamer.cpphttps://github.com/opencv/opencv/pull/25557#discussion_r1592715602:

@@ -1618,7 +1618,7 @@ bool GStreamerCapture::open(const String &filename_, const cv::VideoCaptureParam { //do not emit signals: all calls will be synchronous and blocking gst_app_sink_set_emit_signals (GST_APP_SINK(sink.get()), FALSE);

• caps.attach(gst_caps_from_string("video/x-raw, format=(string){BGR, GRAY8}; video/x-bayer,format=(string){rggb,bggr,grbg,gbrg}; image/jpeg"));

It breaks grayscale streams. I propose to try:

caps.attach(gst_caps_from_string("video/x-raw, format=(string){BGR, BGRx, GRAY8}; video/x-bayer,format=(string){rggb,bggr,grbg,gbrg}; image/jpeg"));

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