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The legacy scaler is no longer implicitly used to generate a reference to perform comparisons for every conversion. It is now up to the user to generate a reference file and use it as input for a separate run to perform comparisons. It is now possible to compare against previous runs of the graph-based scaler, for example to test for newer optimizations. This reduces the overall time necessary to obtain speedup numbers from the legacy scaler to the graph-based scaler (or any other comparison, for that matter) since the reference must only be run once. For example, to check the speedup between the legacy scaler and the graph-based scaler: ./libswscale/tests/swscale [...] -bench 50 -legacy 1 > legacy_ref.txt ./libswscale/tests/swscale [...] -bench 50 -ref legacy_ref.txt If no -ref file is specified, we are assuming that we are generating a reference file, and therefore all information is printed (including ssim/loss, and benchmarks if -bench is used). If a -ref file is specified, the output printed depends on whether we are testing for correctness (ssim/loss only) or benchmarking (time/ speedup only, along with overall speedup). Sponsored-by: Sovereign Tech Fund Signed-off-by: Ramiro Polla <ramiro.polla@gmail.com>