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Single script with three modes: * --label internal --output /tmp/ltx2_sr_internal.pt : runs the legacy from_pretrained kwargs path and saves frames + metadata. Used against PYTHONPATH=../FastVideo-internal as the reference run. * --label public --use-typed-api --output /tmp/ltx2_sr_public.pt : runs through the new GeneratorConfig + GenerationRequest typed API with pipeline.preset_overrides["refine"] driving the SR path. Used against PYTHONPATH=../FastVideo (the public package) for the candidate run. * --diff --reference R --candidate C : loads both .pt files and reports shape parity + max_abs / mean_abs / rms / psnr / pixel-bucket histograms over the uint8 frames. Pinned alignment fixture: PROMPT + seed + 1088x1920x121x24fps + 8 base steps + 3 refine steps mirrors basic_ltx2_upscale.py upstream so we exercise the same code path the user has been generating with. Deliberately skips FP4 (no quant config) and Dreamverse runtime knobs to keep the bf16 path clean per request. The two runs are intentionally invoked in separate processes via PYTHONPATH overrides because both repos register as the `fastvideo` package and can't be imported together. The diff script then runs in either env to load both .pt files and compute the alignment metrics. Co-authored-by: Junda (David) Su <90978028+Davids048@users.noreply.github.com> Co-authored-by: Matthew Noto <99706358+RandNMR73@users.noreply.github.com> Co-authored-by: XOR-op <17672363+XOR-op@users.noreply.github.com> Co-authored-by: Zhang Peiyuan <42993249+jzhang38@users.noreply.github.com>