<html><head></head><body><div>On Fri, 2021-06-25 at 14:26 +0530, Samyak via gstreamer-devel wrote:</div><blockquote type="cite" style="margin:0 0 0 .8ex; border-left:2px #729fcf solid;padding-left:1ex"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr">Hey,<div>Please let me know if this is the wrong place to ask questions or if my question has been answered before. </div><div><br></div><div>My question is I want to use a newer version of gstreamer with gstreamer-rs. I am using gst-build to build a local version of gstreamer to build the master branch and I want gstreamer-rs to use that instead of using my global gstreamer which is on 1.18. </div><div><br></div><div>To give some context around my reasoning to use the master branch (I'm giving this context so that I can get a better overall solution in case I'm taking the wrong approach here). I am using Arch Linux which means I'm using cuda 11.3.0-2. Based on this issue: <a href="https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/issues/1469">https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/issues/1469</a>, gstreamer 1.18 has issues with that. Because of this when I use gst-inspect, I don't get cudascale or any of the cuda functions. When I use gst-build to build the master branch, everything works when I try gst-launch. But I want to actually use the gstreamer-rs bindings.</div><div>I have tried to clone the gstreamer-rs repo, and run the instructions from here: <a href="https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/blob/master/DEVELOPMENT.md">https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/blob/master/DEVELOPMENT.md</a> and also set PKG_CONFIG env variable to the meson-private directory from the gst-build. I then compiled using the v1_20 feature on Cargo and the compilation worked. But, when I try using gst::ElementFactory::make("cudaupload", Some("cudaupoad"), I get this error: </div><div>BoolError { message: "Failed to create element from factory name", filename: "<home_dir>/Documents/projects/gstreamer-rs/gstreamer/src/auto/<a href="http://element_factory.rs">element_factory.rs</a>", function: "gstreamer::auto::element_factory", line: 204 }', src/main.rs:10:82</div><div><br></div><div>Here's the full backtrace if that helps: <a href="https://pastebin.com/1U0qWWkH">https://pastebin.com/1U0qWWkH</a></div><div><br></div><div>Couple of questions on my end:</div><div>1. Do we know for a fact if gstreamer-rs is using my local build? How do I verify this? It seems weird that when I run the devenv on gst-build I am able to run cudascale with gst-launch but it does not seem to be working with gstreamer-rs.</div></div></div></div></div></blockquote><div><br></div><div>Check the GStreamer debug logs. If you run with GST_DEBUG=6 you'll see a lot of output, and especially at the beginning you'll see which GStreamer version from where it is using and where it's trying to load the plugins.</div><div>At the moment you're trying to create the element you should also see something meaningful in the logs.</div><div><br></div><blockquote type="cite" style="margin:0 0 0 .8ex; border-left:2px #729fcf solid;padding-left:1ex"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div>2. Am I writing the rust code wrong? Is elementfactory the wrong way to create cuda elements on Rust?</div></div></div></div></div></blockquote><div><br></div><div>That's the correct way.</div><div><br></div><blockquote type="cite" style="margin:0 0 0 .8ex; border-left:2px #729fcf solid;padding-left:1ex"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div>3. Is there any sample I can refer to so maybe I can try reverse engineering this? Or has gstreamer-rs never been tested with cuda support before?</div></div></div></div></div></blockquote><div><br></div><div>I'm not aware of any CUDA example or anybody having used gstreamer-rs with CUDA elements, but there's nothing special about the bindings in that regard.</div><div>If it works with gst-launch then it will also work with the bindings as long as the environment setup is the same.</div><div><br></div><div><span><pre>-- <br></pre><div data-evo-paragraph="" class="" style="width: 71ch;" data-evo-signature-plain-text-mode="">Sebastian Dröge, Centricular Ltd · <a href="http://www.centricular.com">https://www.centricular.com</a></div><div data-evo-paragraph="" class="" style="width: 71ch;"><br></div></span></div></body></html>