.. meta::
    :description: rocJPEG environment variables
    :keywords: rocJPEG, environment variables, ROCm, AMD

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rocJPEG environment variables
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The following environment variables affect the rocJPEG runtime.

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   * - 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``.