rocJPEG environment variables

2026-06-03

1 min read time

Applies to Linux

The following environment variables affect the rocJPEG runtime.

Environment variable	Values
HIP_VISIBLE_DEVICES	Comma-separated list of GPU indices. Parsed when ROCR_VISIBLE_DEVICES isn’t set.
ROCJPEG_ENABLE_VCN_HW_CSC	1: Enables hardware color-space conversion when there are eight or more JPEG cores and RGB or RGB planar output is in use. Hardware color-space conversion is off by default regardless of the number of cores. Not used for CSS_440 (4:4:0) chroma subsampling even when enabled.
ROCJPEG_LOG_LEVEL	Sets the maximum severity of log messages. Each level defines the maximum severity of log messages to output. 0: Output critical messages only (default) 1: Output critical and error messages 2: Output critical, error, and warning messages 3: Output critical, error, warning, and info messages 4: Output critical, error, warning, info, and debug messages
ROCR_VISIBLE_DEVICES	Takes a comma-separated list of GPU indices. When set, the VAAPI decoder path parses this list before it falls back to HIP_VISIBLE_DEVICES.