--generate-dv now takes an HDR10 base and measures L1 with FFmpeg when there is no usable HDR10+ metadata. -r HDR10 or -r HDR10P with the flag runs as a hybrid of that base alone, --sample shifts the DV RPU to match the base, and the REST API accepts generate_dv with any range.
cast_dl_params feeds ctx.params to dl() and dl.result() as on the CLI. A string lang value now returns 400 instead of splitting into letters, and -r accepts HDR10+.
standard_resolution() replaces the aspect-ratio logic in naming and is shared by -q matching, export names and progress/hybrid labels, so 1920x1088, 1916x1076, portrait and DCI sizes get standard names.
get_tracks_for_variants skips a later manifest's track when a held track has the same signature, so a track whose ID changes per manifest is listed once.
Builds per-scene L1 in unshackle (PQ mean, letterbox-aware) with a generate_dv_mode config (v29/v40/legacy); a failed hybrid no longer exits 0 with no video.
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