<div dir="auto">You should consider converting to yuv on the opengl side. Saving transfer penelty to/from gpu. <div dir="auto"><div dir="auto"> </div><div dir="auto">Nvidia has a strain of gstreamer that handles converting on the gpu. For Jetson platform. </div><div dir="auto">Also ridgerun is active there with gstisp, not sure about raspi support. </div><div dir="auto"> </div><div dir="auto"> </div></div></div> <div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Apr 24, 2020, 13:15 Milian Wolff <<a href="mailto:milian.wolff@kdab.com">milian.wolff@kdab.com</a>> wrote: </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hey there! this is a re-post of [1] to this mailing list, as I was directed here. [1]: <a href="https://www.raspberrypi.org/forums/viewtopic.php" rel="noreferrer noreferrer" target="_blank">https://www.raspberrypi.org/forums/viewtopic.php</a>? f=70&t=271720&sid=c5b8e22d61541521d6509330663b5fa8 We are trying to optimize a gstreamer pipeline running on a rpi3b+ where, according to gst-shark, the current main bottleneck is a videoconvert element. That one is necessary to convert OpenGL frames in RGBA format to YUV for omxh264enc. This is a simplified example pipeline: ``` gst-launch-1.0 gltestsrc \ ! "video/x-raw(memory:GLMemory),format=RGBA,width=640,height=480" \ ! gldownload ! queue \ ! videoconvert \ ! omxh264enc ! avimux ! filesink location=test.avi ``` My first approach was trying to get omxh264enc work directly with RGBA frames, see: <a href="https://gitlab.freedesktop.org/gstreamer/gst-omx/-/merge_requests/62" rel="noreferrer noreferrer" target="_blank">https://gitlab.freedesktop.org/gstreamer/gst-omx/-/merge_requests/62</a> This in turn led me to v4l2convert and v4l2h264enc (see https:// <a href="http://www.raspberrypi.org/forums/viewtopic.php?t=245852" rel="noreferrer noreferrer" target="_blank">www.raspberrypi.org/forums/viewtopic.php?t=245852</a>). We have now updated our stack to the following versions: ``` linux 4.19.88 gstreamer 1.16.1 ``` When I replace the omxh264enc with v4l2h264enc I run into the first issue: ``` gst-launch-1.0 gltestsrc \ ! "video/x-raw(memory:GLMemory),format=RGBA,width=640,height=480" \ ! gldownload ! queue \ ! videoconvert \ ! v4l2h264enc ! avimux ! filesink location=test.avi ERROR: from element /GstPipeline:pipeline0/GstGLTestSrc:gltestsrc0: Internal data stream error. Additional debug info: ../../../../gstreamer-1.16.1/libs/gst/base/gstbasesrc.c(3072): gst_base_src_loop (): /GstPipeline:pipeline0/GstGLTestSrc:gltestsrc0: streaming stopped, reason not-negotiated (-4) ``` Can someone explain what's going on here? I've also tried adding a `glcolorconvert ! "video/x-raw(memory:GLMemory),format=BGRA"` before the gldownload, but to no avail. The full output with GST_DEBUG="*:3" is: ``` Setting pipeline to PAUSED ... 0:00:00.238494323 1765 0x2361ba0 WARN v4l2 gstv4l2object.c:4196:gst_v4l2_object_probe_caps:<v4l2h264enc0:src> Failed to probe pixel aspect ratio with VIDIOC_CROPCAP: Invalid argument Pipeline is PREROLLING ... 0:00:00.242415365 1765 0x23386c0 FIXME default gstutils.c: 3981:gst_pad_create_stream_id_internal:<gltestsrc0:src> Creating random stream-id, consider implementing a deterministic way of creating a stream-id Got context from element 'gldownloadelement0': gst.gl.GLDisplay=context, gst.gl.GLDisplay=(GstGLDisplay)"\(GstGLDisplayEGL\)\ gldisplayegl0"; 0:00:00.264218855 1765 0x23381b0 WARN basetransform gstbasetransform.c:1364:gst_base_transform_setcaps:<videoconvert0> transform could not transform video/x-raw, format=(string)RGBA, width=(int)640, height=(int)480, framerate=(fraction)30/1, interlace-mode=(string)progressive in anything we support 0:00:00.271333542 1765 0x23381b0 WARN basetransform gstbasetransform.c:1364:gst_base_transform_setcaps:<videoconvert0> transform could not transform video/x-raw, format=(string)RGBA, width=(int)640, height=(int)480, framerate=(fraction)30/1, interlace-mode=(string)progressive in anything we support 0:00:00.271435157 1765 0x23381b0 WARN GST_PADS gstpad.c: 4231:gst_pad_peer_query:<queue0:src> could not send sticky events 0:00:00.293517917 1765 0x23581b0 FIXME glslstage gstglslstage.c:518:_compile_shader:<glslstage0> vertex shader info log:Compiled 0:00:00.294581980 1765 0x23581b0 FIXME glslstage gstglslstage.c:518:_compile_shader:<glslstage1> fragment shader info log:Compiled 0:00:00.306531615 1765 0x23581b0 FIXME glslstage gstglslstage.c:518:_compile_shader:<glslstage2> vertex shader info log:Compiled 0:00:00.307533698 1765 0x23581b0 FIXME glslstage gstglslstage.c:518:_compile_shader:<glslstage3> fragment shader info log:Compiled 0:00:00.342931927 1765 0x23381b0 WARN basetransform gstbasetransform.c:1364:gst_base_transform_setcaps:<videoconvert0> transform could not transform video/x-raw, format=(string)RGBA, width=(int)640, height=(int)480, framerate=(fraction)30/1, interlace-mode=(string)progressive in anything we support 0:00:00.350237917 1765 0x23381b0 WARN basetransform gstbasetransform.c:1364:gst_base_transform_setcaps:<videoconvert0> transform could not transform video/x-raw, format=(string)RGBA, width=(int)640, height=(int)480, framerate=(fraction)30/1, interlace-mode=(string)progressive in anything we support 0:00:00.354808438 1765 0x23386c0 WARN basesrc gstbasesrc.c: 3072:gst_base_src_loop:<gltestsrc0> error: Internal data stream error. 0:00:00.355374011 1765 0x23386c0 WARN basesrc gstbasesrc.c: 3072:gst_base_src_loop:<gltestsrc0> error: streaming stopped, reason not- negotiated (-4) 0:00:00.356358646 1765 0x23386c0 WARN queue gstqueue.c: 988:gst_queue_handle_sink_event:<queue0> error: Internal data stream error. ERROR: from element /GstPipeline:pipeline0/GstGLTestSrc:gltestsrc0: Internal data stream error. Additional debug info: ../../../../gstreamer-1.16.1/libs/gst/base/gstbasesrc.c(3072): gst_base_src_loop (): /GstPipeline:pipeline0/GstGLTestSrc:gltestsrc0: streaming stopped, reason not-negotiated (-4) ERROR: pipeline doesn't want to preroll. Setting pipeline to NULL ... 0:00:00.357002709 1765 0x23386c0 WARN queue gstqueue.c: 988:gst_queue_handle_sink_event:<queue0> error: streaming stopped, reason not- negotiated (-4) Freeing pipeline ... ``` I can manage to workaround this by explicitly letting the videoconvert do the YUV conversion like this: ``` gst-launch-1.0 gltestsrc \ ! "video/x-raw(memory:GLMemory),format=RGBA,width=640,height=480" \ ! gldownload ! queue \ ! videoconvert ! "video/x-raw,format=I420" \ ! v4l2h264enc ! avimux ! filesink location=test.avi ``` No more errors, but the resulting test.avi file is completely broken. I can play it with cvlc but its all green and garbled... Can someone explain what's going on here? Now, let's try to stick to omxh264enc and replace videoconvert instead: ``` gst-launch-1.0 gltestsrc \ ! "video/x-raw(memory:GLMemory),format=RGBA,width=640,height=480" \ ! gldownload ! queue \ ! v4l2convert \ ! omxh264enc ! avimux ! filesink location=test.avi WARNING: erroneous pipeline: could not link queue0 to v4l2convert0 ``` Which is odd, but expected considering the following: ``` gst-inspect-1.0 v4l2convert ... video/x-raw format: { (string)YUY2, (string)YVYU, (string)UYVY, (string)I420, (string)YV12, (string)RGB, (string)BGR, (string)BGR x, (string)BGRA, (string)RGB16, (string)NV12, (string)NV21 } width: [ 1, 32768 ] height: [ 1, 32768 ] framerate: [ 0/1, 2147483647/1 ] ``` So, why is RGBA not supported here? Well, let's try to add a glcolorconvert to BGRA, but that fails too: ``` gst-launch-1.0 gltestsrc \ ! "video/x-raw(memory:GLMemory),format=RGBA,width=640,height=480" \ ! glcolorconvert ! "video/x-raw(memory:GLMemory),format=BGRA" \ ! gldownload ! queue \ ! v4l2convert \ ! omxh264enc ! avimux ! filesink location=test.avi ERROR: from element /GstPipeline:pipeline0/GstGLTestSrc:gltestsrc0: Internal data stream error. Additional debug info: ../../../../gstreamer-1.16.1/libs/gst/base/gstbasesrc.c(3072): gst_base_src_loop (): /GstPipeline:pipeline0/GstGLTestSrc:gltestsrc0: streaming stopped, reason not-negotiated (-4) ERROR: pipeline doesn't want to preroll. ``` I've tried some of the other RGB formats, but none seem to work here. What am I missing? I've attached the full `:4 GST_DEBUG trace log` file over on the rpi forum at [2] [2]: <a href="https://www.raspberrypi.org/forums/download/file.php" rel="noreferrer noreferrer" target="_blank">https://www.raspberrypi.org/forums/download/file.php</a>? id=36357&sid=376f023986c765adc4950fe5e1335652 Thanks a lot -- Milian Wolff | <a href="mailto:milian.wolff@kdab.com" target="_blank" rel="noreferrer">milian.wolff@kdab.com</a> | Senior Software Engineer KDAB (Deutschland) GmbH, a KDAB Group company Tel: +49-30-521325470 KDAB - The Qt, C++ and OpenGL Experts_______________________________________________ gstreamer-devel mailing list <a href="mailto:gstreamer-devel@lists.freedesktop.org" target="_blank" rel="noreferrer">gstreamer-devel@lists.freedesktop.org</a> <a href="https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel" rel="noreferrer noreferrer" target="_blank">https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a> </blockquote></div>