Add extension-frame refine and lossless anchor options.

Prefer clip anchor PNGs for handoffs, optionally run Bilateral+Flux cleanup before I2V, and save decoded last-frame anchors so sequential extensions accumulate less compression damage.

Co-authored-by: Cursor <cursoragent@cursor.com>

server/api/generate.post.ts

@@ -6,6 +6,12 @@ import { defaultVideoSteps, isLtxWorkflow, isTextToVideo, LTX_DISABLED_MESSAGE,
 import { allowIdentityRefs, normalizePermanenceRefs, resolveGlobalLocks, type PermanenceRef } from '~/utils/globalLocks'
 import { composePromptParts, ingestPromptParts, persistPromptWrappers } from '~/utils/promptParts'
 import type { QueuedExtension } from '~/server/utils/library'
+import {
+  clampRefinementDenoise,
+  parseRefineExtensionFrame,
+  parseSaveLosslessAnchor,
+  REFINEMENT_DENOISE_DEFAULT
+} from '~/utils/extensionFrame'
 
 function parseDuration(raw: unknown) {
   const seconds = Number(raw)
@@ -250,6 +256,9 @@ export default defineEventHandler(async (event) => {
   const chainTotal = 1 + extensions.length
   const familyId = crypto.randomUUID()
   const queueAutoRun = fields.queueAutoRun === 'true'
+  const refineExtensionFrame = parseRefineExtensionFrame(fields.refineExtensionFrame, true)
+  const saveLosslessAnchor = parseSaveLosslessAnchor(fields.saveLosslessAnchor, false)
+  const refinementDenoise = clampRefinementDenoise(fields.refinementDenoise, REFINEMENT_DENOISE_DEFAULT)
   const studio = await addStudioJob({
     ownerKey,
     familyId,
@@ -282,6 +291,9 @@ export default defineEventHandler(async (event) => {
       referenceStillIds,
       extensions,
       queueAutoRun,
+      refineExtensionFrame,
+      saveLosslessAnchor,
+      refinementDenoise,
       globalLocks: globalLocks || undefined,
       permanenceRefs: permanenceRefs.length ? permanenceRefs : undefined,
       shotPermanenceRefs: shotPermanenceRefs.some(item => item.length) ? shotPermanenceRefs : undefined,