Environment Variables

Rockchip Platform Support

The Rockchip SDK usually configures the relevant environment variables centrally in /etc/profile.d/gst.sh.

Environment Variable	Purpose
`GST_MPP_DEC_DISABLE_NV12_10=1`	Disable direct 10-bit NV12 output and attempt to convert it to NV12
`GST_MPP_DEC_DISABLE_NV16_10=1`	Disable direct 10-bit NV16 output and attempt to convert it to NV12
`GST_MPP_VIDEODEC_DEFAULT_FORMAT=NV12`	Make the MPP decoder output NV12 by default; this may invoke RGA
`GST_MPP_VIDEODEC_DEFAULT_ARM_AFBC=1`	Enable AFBC output from the MPP decoder by default
`GST_V4L2_PREFERRED_FOURCC=...`	Set the preferred order of V4L2 pixel formats
`GST_VIDEO_CONVERT_PREFERRED_FORMAT=...`	Set the preferred order of `videoconvert` output formats
`GST_V4L2SRC_MAX_RESOLUTION=3840x2160`	Limit the maximum resolution that `v4l2src` can negotiate
`GST_V4L2_MIN_BUFS=64`	Set the minimum number of V4L2 driver buffers
`GST_VIDEO_CONVERT_USE_RGA=1`	Enable the RGA path for format conversion and scaling
`GST_VIDEO_FLIP_USE_RGA=1`	Enable the RGA path for rotation and flipping

Set only the variables required by the application, and record the environment when documenting an issue:

env | grep '^GST_' | sort