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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b>Hello! I’m writing a custom element that, depending on which element it is connected to, I get the following error:<o:p></o:p></b></p>
<p class="MsoNormal"><b><o:p> </o:p></b></p>
<p class="MsoNormal"><b>0:00:00.146996442 2491 0xaaaafa871000 ERROR basetransform gstbasetransform.c:482:gst_base_transform_transform_caps:<custom_element> transform_caps returned caps video/x-raw, format=(string){ RGB, NV12, I420, YV12, NV21, YUYV,
YVYU, UYVY, VYUY, NV16, NV61, YUY2 }, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ] which are not a real subset of the filter caps video/x-raw, format=(string)YUY2, width=(int)1920, height=(int)1080<o:p></o:p></b></p>
<p class="MsoNormal"><b><o:p> </o:p></b></p>
<p class="MsoNormal"><b>** (gst-launch-1.0:2491): WARNING **: 20:26:35.991: customelement0 : transform_caps returned caps which are not a real subset of the filter caps<o:p></o:p></b></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">But the pipeline doesn’t break, it works just fine.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">For this custom element I wrote the following transform_caps function:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">static GstCaps*<o:p></o:p></p>
<p class="MsoNormal">transform_caps(GstBaseTransform* trans,<o:p></o:p></p>
<p class="MsoNormal"> GstPadDirection direction,<o:p></o:p></p>
<p class="MsoNormal"> GstCaps* caps,<o:p></o:p></p>
<p class="MsoNormal"> GstCaps* filter)<o:p></o:p></p>
<p class="MsoNormal">{<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> if (direction == GST_PAD_SINK) {<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> filter = gst_caps_from_string(<o:p></o:p></p>
<p class="MsoNormal"> GST_TENSOR_CAP_DEFAULT<o:p></o:p></p>
<p class="MsoNormal"> ";" GST_TENSORS_CAP_MAKE("{ static, flexible }"));<o:p></o:p></p>
<p class="MsoNormal"> } else if (direction == GST_PAD_SRC) {<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> filter = gst_caps_from_string(<o:p></o:p></p>
<p class="MsoNormal"> GST_VIDEO_CAPS_MAKE("{ RGB, NV12, I420, YV12, NV21, YUYV, YVYU, "<o:p></o:p></p>
<p class="MsoNormal"> "UYVY, VYUY, NV16, NV61, YUY2 }"));<o:p></o:p></p>
<p class="MsoNormal"> }<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> return filter;<o:p></o:p></p>
<p class="MsoNormal">}<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The element is used in a machine learning pipeline, and it should receive video frames with the caps referred in the code snippet, and it will output tensors, that’s why I used the NNStreamer defines (namely GST_TENSOR_CAP_DEFAULT, GST_TENSORS_CAP_MAKE
) when the direction is GST_PAD_SINK.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I want to know if there’s something wrong in that transform_caps, because the error doesn’t break the pipeline nor it always happens. Or can I just ignore this error?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks!<o:p></o:p></p>
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