streaming from imx6

[Thornton, Keith]

Hi, I'm having difficulties setting up a streaming pipeline on an imx6 running the mainline kernel and gstreamer 1.14.1.
The following pipelines work as required

This streaming pipeline withot dma buffers and using openh264 drops lots of frames
./test-launch "( v4l2src min-buffers=16 device=/dev/v4l/by-path/platform-capture-subsystem-video-index4 ! video/x-raw,format=NV12,width=1920,height=1080,framerate=60000/1001,interlace-mode=progressive,colorimetry=bt709 ! videorate drop-only=true skip-to-first=true !videoconvert ! video/x-raw,framerate=30/1 ! openh264enc  ! video/x-h264,profile=baseline ! queue ! h264parse ! rtph264pay name=pay0
pt=96 )"

This recording pipeline using dma buffers and v4l2h264enc storing to file also works
gst-launch-1.0 v4l2src min-buffers=10 num-buffers=150 device=/dev/v4l/by-path/platform-capture-subsystem-video-index4 io-mode=dmabuf ! video/x-raw,format=NV12,width=1920,height=1080,framerate=60000/1001 ! v4l2h264enc output-io-mode=dmabuf-import extra-controls=cid,video_bitrate=12000000,video_gop_size=30 ! h264parse ! qtmux ! filesink location=ZNB_30fps_2.mp4

but streaming using v4l2h264enc and dma buffers doesn't work
./test-launch "( v4l2src min-buffers=10 device=/dev/v4l/by-path/platform-capture-subsystem-video-index4 io-mode=4 ! video/x-raw,format=NV12,width=1920,height=1080,framerate=60000/1001,interlace-mode=progressive,colorimetry=bt709 ! v4l2h264enc output-io-mode=5 output-min-buffers=6 ! video/x-h264,profile=baseline ! rtph264pay name=pay0 pt=96 )"

The following log is produced
0:00:07.327381335   634 0x74f0f2f0 WARN          v4l2bufferpool gstv4l2bufferpool.c:804:gst_v4l2_buffer_pool_start:<v4l2h264enc0:pool:src> Uncertain or not enough buffers, enabling copy threshold
0:00:07.582559335   634 0x74f0f2f0 WARN            v4l2videoenc gstv4l2videoenc.c:782:gst_v4l2_video_enc_handle_frame:<v4l2h264enc0> error: Failed to allocate required memory.
0:00:07.582796001   634 0x74f0f2f0 WARN            v4l2videoenc gstv4l2videoenc.c:782:gst_v4l2_video_enc_handle_frame:<v4l2h264enc0> error: Buffer pool activation failed
0:00:07.583304001   634 0x74f0f2f0 WARN                 basesrc gstbasesrc.c:3055:gst_base_src_loop:<v4l2src0> error: Internal data stream error.
0:00:07.583435001   634 0x74f0f2f0 WARN                 basesrc gstbasesrc.c:3055:gst_base_src_loop:<v4l2src0> error: streaming stopped, reason error (-5)
0:00:07.583347335   634 0x75c0e860 WARN               rtspmedia rtsp-media.c:2720:default_handle_message: 0x75c1ce18: got error Failed to allocate required memory. (gstv4l2videoenc.c(782): gst_v4l2_video_enc_handle_frame (): /GstPipeline:media-pipeline/GstBin:bin0/v4l2h264enc:v4l2h264enc0:
Buffer pool activation failed)
0:00:07.583797668   634  0x10adc90 WARN               rtspmedia rtsp-media.c:2989:wait_preroll: failed to preroll pipeline
0:00:07.583841335   634 0x75c0e860 WARN               rtspmedia rtsp-media.c:2720:default_handle_message: 0x75c1ce18: got error Internal data stream error. (gstbasesrc.c(3055): gst_base_src_loop (): /GstPipeline:media-pipeline/GstBin:bin0/GstV4l2Src:v4l2src0:
streaming stopped, reason error (-5))
0:00:07.584003001   634  0x10adc90 WARN               rtspmedia rtsp-media.c:3293:gst_rtsp_media_prepare: failed to preroll pipeline
0:00:07.601349335   634  0x10adc90 ERROR             rtspclient rtsp-client.c:1044:find_media: client 0x10b8898: can't prepare media
0:00:07.603700001   634  0x10adc90 ERROR             rtspclient rtsp-client.c:2898:handle_describe_request: client 0x10b8898: no media

Maybe someone has an explanation as to what is wrong with the last pipeline. I can't explain why it doesn't work
It also makes no difference if I reduce the framerate using videorate.
Thanks for any replies
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