Why is connecting vaapi decoder to v4l2sink stuttering?

[Nicolas Dufresne]

Le dim. 6 nov. 2022, 10 h 22, Christian Hattenberger <
christian.hattenberger at gmail.com> a écrit :

> 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 argument
>
> 0:00:00.377023310 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 2
>
> 0:00:00.377052711 18843 0x7f4d44041460 ERROR             bufferpool
> gstbufferpool.c:559:gst_buffer_pool_set_active:<v4l2sink0:pool1:sink> start
> failed
>
> …
>
>
>
> v4l2-ctl -d /dev/video0 --all
>
> Driver Info:
>
>         Driver name      : v4l2 loopback
>
>         Card type        : Dummy video device (0x0000)
>
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.


        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 Format
>
> Priority: 2
>
> Video 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     : 2
>
> Streaming 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 <nicolas at ndufresne.ca>
> *Gesendet:* Sonntag, 6. November 2022 14:32
> *An:* Discussion of the development of and with GStreamer <
> gstreamer-devel at lists.freedesktop.org>
> *Cc:* Christian Hattenberger <christian.hattenberger at gmail.com>
> *Betreff:* Re: Why is connecting vaapi decoder to v4l2sink stuttering?
>
>
>
>
>
> Le sam. 5 nov. 2022, 13 h 16, Christian Hattenberger via gstreamer-devel <
> gstreamer-devel at lists.freedesktop.org> a écrit :
>
> 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
>
>
>
> 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.
>
>
>
> Nicolas
>
>
>
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