v4l2src x265enc with Redistribute latency... no image show

[Erickson.LU]

I tried the pipline /"GST_DEBUG=4 gst-launch-1.0 videotestsrc ! "video/x-raw,
format=(string)I420" ! x265enc ! avdec_h265 ! autovideosink"/. It worked

*But , pipline*
/GST_DEBUG=3 gst-launch-1.0 v4l2src  device="/dev/video0" num-buffers=300 !
"video/x-raw, format=(string)I420, width=(int)800, height=(int)600,
pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive,
framerate=(fraction)30/1" ! x265enc ! avdec_h265 ! xvimagesink /
*or*
/GST_DEBUG=3 gst-launch-1.0 v4l2src  device="/dev/video0" num-buffers=300 !
"video/x-raw, format=(string)I420, width=(int)800, height=(int)600,
pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive,
framerate=(fraction)30/1" ! x265enc ! avdec_h265 ! autovideosink/
*did not.*

They just leave a warning info 
/0:00:00.568824628 16861      0x1dd08a0 WARN          v4l2bufferpool
gstv4l2bufferpool.c:540:gst_v4l2_buffer_pool_set_config:<v4l2src0:pool:src>
libv4l2 converter detected, disabling CREATE_BUFS/

I can use /*gst-launch-1.0 v4l2src ! "video/x-raw, format=(string)I420" !
autovideosink*/ to show the camera.

But i really need the H265 encode, someone said it's the buffer problem or
gstreamer bug, but i can't fixed it. Could you show me something i can fix
that thing.
Truly Thanks...



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