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To open a device via a GstDeviceProvider use the GstDevice it offers:<br>
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<a href="https://gstreamer.freedesktop.org/documentation/gstreamer/gstdevice.html?gi-language=c#gst_device_create_element" id="LPlnk194210">https://gstreamer.freedesktop.org/documentation/gstreamer/gstdevice.html?gi-language=c#gst_device_create_element</a></div>
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The classes listed by a provider are just unsorted categories. "Video/Source" and "Source/Video" can be seen as identical.</div>
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They exist to allow for filtering ( gst_device_monitor_add_filter(monitor, "Video/Source/something", NULL); ).</div>
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I am not familiar with these source elements so i cannot comment on them specifically.</div>
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If you get muliple elements for a piece of hardware you can probably choose the first one and be fine.</div>
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Alternatively you will have to look at the offered properties to make decisions programatically e.g. device.api = mediafoundation.</div>
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<div class="elementToProof"><span>- Edgar<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> gstreamer-devel <gstreamer-devel-bounces@lists.freedesktop.org> on behalf of ÕÅÐÀ via gstreamer-devel <gstreamer-devel@lists.freedesktop.org><br>
<b>Sent:</b> Thursday, February 23, 2023 07:21<br>
<b>To:</b> gstreamer-devel@lists.freedesktop.org <gstreamer-devel@lists.freedesktop.org><br>
<b>Cc:</b> ÕÅÐÀ <seanzhangxinsh@gmail.com><br>
<b>Subject:</b> How to select the device-path for videosrc</font>
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<div dir="ltr">My laptop has 1 integrated cam, but when I run gst-device-monitor-1.0.exe to get device path, there are 2 device-paths for same device, and it seems one device-path is for ksvideosrc, it class is "class : Video/Source", the other one is for mfvideosrc,
class is "Source/Video". My question is how to programally select a correct device for mfdevice? I pasted a part of output of "gst-device-monitor-1.0.exe" as below:
<div>Device found:<br>
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name : Integrated Camera<br>
class : Video/Source<br>
caps : image/jpeg, width=1280, height=720, framerate=30/1, pixel-aspect-ratio=1/1<br>
...<br>
image/jpeg, width=320, height=180, framerate=30/1, pixel-aspect-ratio=1/1<br>
video/x-raw, format=YUY2, width=1280, height=720, framerate=10/1, pixel-aspect-ratio=1/1<br>
...<br>
video/x-raw, format=YUY2, width=320, height=180, framerate=30/1, pixel-aspect-ratio=1/1<br>
gst-launch-1.0 ksvideosrc device-path="\\\\\?\\usb\#vid_174f\&pid_2435\&mi_00\#6\&1a775b38\&1\&0000\#\{6994ad05-93ef-11d0-a3cc-00a0c9223196\}\\global" ! ...<br>
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<div>Device found:<br>
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name : Integrated Camera<br>
class : Source/Video<br>
caps : video/x-raw, format=BGR, width=1280, height=720, framerate=10/1, pixel-aspect-ratio=1/1<br>
video/x-raw, format=BGR, width=960, height=540, framerate=15/1, pixel-aspect-ratio=1/1<br>
...<br>
video/x-raw, format=BGR, width=320, height=180, framerate=30/1, pixel-aspect-ratio=1/1<br>
video/x-raw, format=NV12, width=1280, height=720, framerate=30/1, pixel-aspect-ratio=1/1, colorimetry=1:4:0:1<br>
video/x-raw, format=NV12, width=960, height=540, framerate=30/1, pixel-aspect-ratio=1/1, colorimetry=1:4:0:1<br>
...<br>
image/jpeg, width=320, height=180, framerate=30/1, pixel-aspect-ratio=1/1, colorimetry=1:4:0:1<br>
properties:<br>
device.api = mediafoundation<br>
device.path = \\?\usb#vid_174f&pid_2435&mi_00#6&1a775b38&1&0000#{e5323777-f976-4f5b-9b55-b94699c46e44}\global<br>
<a href="http://device.name">device.name</a> = Integrated Camera<br>
gst-launch-1.0 mfvideosrc device-path="\\\\\?\\usb\#vid_174f\&pid_2435\&mi_00\#6\&1a775b38\&1\&0000\#\{e5323777-f976-4f5b-9b55-b94699c46e44\}\\global" ! ...<br>
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<div>Thanks</div>
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