How to set GPU device ID when decoding with gstreamer nvv4l2decoder?

[yangqun]

I have 2 T4 cards, and I want to decode videos with them and can be setted in gstreamer plugin “nvv4l2decoder”.Is there any propertity can be set in nvv4l2decoder?

[DaneLLL]

Hi,
Do you use Xavier NX? Or desktop GPUs?

[yangqun]

Desktop GPU T4. And there are 2 cards.

[yingliu]

There should be two devices in your system, /dev/nvidia0 and /dev/nvidia1 corresponding to your 2 T4, you can try to set device=/dev/nvidia0(or 1) following your nvv4l2decoder element.

[mchi]

You can use the “gpu-id” option of nvv4l2decoder, and you’d better to specify the “cudadec-memtype” to be “memtype_unified” if you want to transfer to decoded data accross GPUs.

$ gst-inspect-1.0 nvv4l2decoder
…
cudadec-memtype : Set to specify memory type for cuda decoder buffers
flags: readable, writable, changeable only in NULL or READY state
Enum “CudaDecMemType” Default: 2, “memtype_unified”
(0): memtype_device - Memory type Device
(1): memtype_pinned - Memory type Host Pinned
(2): memtype_unified - Memory type Unified
…
gpu-id : Set to GPU Device ID for decoder
flags: readable, writable, changeable only in NULL or READY state
Unsigned Integer. Range: 0 - 4294967295 Default: 0