Want to know if I understand about gstreamer correctly

H Jumogehn jumogehn at gmail.com
Sun Feb 19 02:00:46 UTC 2023


I’d like to make sure some personally uncertain technical understandings
about the secret of gstreamer’s high throughput.

Please tell me I am wrong if my understandings below is really wrong.

   - gstreamer provides high throughput because it can construct and use
   pipelines of mass data stream as effective as possible.
   - The pipeline is placed in kernel space mostly. So the mass data flows
   only in kernel.
   - The mass stream data can be consumed in user space like in the
   appsink. Other than these special pipeline element mostly the data is
   handled in kernel space.
   - In this way gstreamer is able to eliminate inefective data copy
   between user space and kernel space.

nvv4l2camerasrc device=/dev/video0 !
video/x-raw(memory:NVMM),format=UYVY,width=1920,height=1080,framerate=30/1 !
nvvidconv !
video/x-raw,format=BGRx !
videoconvert !
video/x-raw, format=BGR !
appsink drop=1

   - In the pipeline above, the mass data only be outputed to the userspace
   firstly at the end of the pipeline - in the appsink.
   - Other than the appsink the video data only flows in the kernel space
   in the pipeline above.

Is there any misunderstandings above?
I’d like to be sure about my understading.
Thank you very much!
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