<div dir="auto"><div> <div class="gmail_quote"><div dir="ltr" class="gmail_attr">Le dim. 6 nov. 2022, 10 h 22, Christian Hattenberger <<a href="mailto:christian.hattenberger@gmail.com">christian.hattenberger@gmail.com</a>> a écrit : </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="DE" link="blue" vlink="purple"><div class="m_-444630739479408325WordSection1">If I use vaapipostproc in the chain with vaapisink it seems ok, so I think it does dmabuff, but when I use io-mode=dmabuf-import with v4l2sink I get “Failed to allocated required memory” gst-launch-1.0 filesrc location=/mnt/DATA/tearing.mp4 ! decodebin ! v4l2sink io-mode=dmabuf-import device=/dev/video10 … 0:00:00.376954941 18843 0x7f4d44041460 ERROR v4l2allocator gstv4l2allocator.c:740:gst_v4l2_allocator_start:<v4l2sink0:pool1:sink:allocator> error requesting 2 buffers: Invalid argument0:00:00.377023310 18843 0x7f4d44041460 ERROR v4l2bufferpool gstv4l2bufferpool.c:920:gst_v4l2_buffer_pool_start:<v4l2sink0:pool1:sink> we received 0 buffer from device '/dev/video10', we want at least 20:00:00.377052711 18843 0x7f4d44041460 ERROR bufferpool gstbufferpool.c:559:gst_buffer_pool_set_active:<v4l2sink0:pool1:sink> start failed… v4l2-ctl -d /dev/video0 --allDriver Info: Driver name : v4l2 loopback Card type : Dummy video device (0x0000)</div></div></blockquote></div></div><div dir="auto">This out-of-tree driver is incomplete, it does not support dmabuf. You are out of luck here, unless you have time to improve it.</div><div dir="auto"> </div><div dir="auto"> </div><div dir="auto"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="DE" link="blue" vlink="purple"><div class="m_-444630739479408325WordSection1"> Bus info : platform:v4l2loopback-000 Driver version : 5.15.49 Capabilities : 0x85208003 Video Capture Video Output Video Memory-to-Memory Read/Write Streaming Extended Pix Format Device Capabilities Device Caps : 0x05208003 Video Capture Video Output Video Memory-to-Memory Read/Write Streaming Extended Pix FormatPriority: 2Video input : 0 (loopback: ok)Video output: 0 (loopback in)Format Video Output: Width/Height : 1920/1080 Pixel Format : 'NV12' (Y/CbCr 4:2:0) Field : None Bytes per Line : 1920 Size Image : 3110400 Colorspace : Rec. 709 Transfer Function : sRGB YCbCr/HSV Encoding: ITU-R 601 Quantization : Limited Range Flags :Streaming Parameters Video Capture: Frames per second: 30.000 (30/1) Read buffers : 2Streaming Parameters Video Output: Frames per second: 30.000 (30/1) Write buffers : 2 User Controls keep_format 0x0098f900 (bool) : default=0 value=0 sustain_framerate 0x0098f901 (bool) : default=0 value=0 timeout 0x0098f902 (int) : min=0 max=100000 step=1 default=0 value=0 timeout_image_io 0x0098f903 (bool) : default=0 value=0 Von: Nicolas Dufresne <<a href="mailto:nicolas@ndufresne.ca" target="_blank" rel="noreferrer">nicolas@ndufresne.ca</a>> Gesendet: Sonntag, 6. November 2022 14:32 An: Discussion of the development of and with GStreamer <<a href="mailto:gstreamer-devel@lists.freedesktop.org" target="_blank" rel="noreferrer">gstreamer-devel@lists.freedesktop.org</a>> Cc: Christian Hattenberger <<a href="mailto:christian.hattenberger@gmail.com" target="_blank" rel="noreferrer">christian.hattenberger@gmail.com</a>> Betreff: Re: Why is connecting vaapi decoder to v4l2sink stuttering? <div><div> <div><div>Le sam. 5 nov. 2022, 13 h 16, Christian Hattenberger via gstreamer-devel <<a href="mailto:gstreamer-devel@lists.freedesktop.org" target="_blank" rel="noreferrer">gstreamer-devel@lists.freedesktop.org</a>> a écrit :</div><blockquote style="border:none;border-left:solid #cccccc 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm"><div>When I connect a vaapi decoder to v4l2sink the result is not as expected, same happens if I use autovideosink, I know for this I have to use vaapisink and it is working as expected, but is there a solution for v4l2sink? Can someone explain me the reason, is there a solution? gst-launch-1.0 filesrc location=/tmp/video.mp4 ! decodebin ! vaapipostproc ! video/x-raw,format=YUY2 ! v4l2sink device=/dev/video10 </div></blockquote></div></div><div> </div><div>Its experimental, and I am not sure if vaapipostproc does produce dmabuf in this case, but you can enable dmabuf-import on v4l2sink with property io-mode=dmabuf-import . By default, the frames are cpu copied from VA allocated memory into V4L2 allocated memory.</div><div> </div><div>Nicolas</div><div> </div></div></div></div></blockquote></div></div></div>