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ARRIRAW CPU and GPU Options
Decoding ARRIRAW can take some significant processing time, so your system GPU may be usable to accelerate processing. Only nVidia GPUs are supported, on Windows and Linux only. On macOS, 10.13 or later is required in all cases and all decoding is in the CPU.
NOTE : The ARRI GPU preference is set to CPU-only by default! You will want to adjust the settings to the best ones for your system, based on its GPU performance and amount of GPU RAM . Do not assume that the GPU is faster than your desktop CPU! GPUs with only 1-2GB RAM may be usable only if you decrease the settings; if you try to do too much you’ll start seeing empty black frames.
Options are set in the ARRIRAW section of preferences. The GPU mode can be set to Guess, CUDA, or CPU. Note that if the GPU is unusable, the CPU will be used instead.
The other preferences control how much parallelism is used when reading ARRIRAW files. See the tooltips for details. If your GPU is running out of memory, you should reduce the Number of Decoders value.
Increasing the Frames in Flight may increase performance, but might need to be reduced (especially for CPU decoding) to improve user interface responsiveness when scrubbing.
See also the Frames in flight and Reads in flight controls in the Image Input section, which are upper limits to the values here.
There are also two communications Window Size controls at the end of the Image Input section that affect performance and RAM usage for both ARRI and Blackmagic RAW files.
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