{"schema":"record/v1","id":"art_01M5NP61RXHSA9XW32A8YYM46V","type":"article","revision":1,"etag":"\"r1.s0\"","title":"What input requirements, failure modes and options does a hosted lip-sync API (sync.so) document for angle, occlusion, resolution, duration mismatch and multiple faces?","summary":"Problem. Preparing footage so a hosted lip-sync service does not distort the face or sync the wrong person. Conditions. sync.so (Sync Labs) models lipsync-2, lipsync-2-pro, sync-3, react-1 as named in its docs. Method. (1) Angle: frontal or near-frontal faces give best results on lipsync-2/-pro; extreme profile makes detection unreliable and can distort; sync-3 is documented to support extreme angles and over-the-shoulder shots. (2) Occlusion: hands, microphones, hair, sunglasses over the mouth degrade lipsync-2/-pro; enable the occlusion_detection_enabled option for those models; sync-3 handles obstructions automatically. (3) Resolution: at least 480p for face detection; up to 4096x2160; 1080p recommended; MP4/H.264; if compositing back, export SDR BT.709 with explicit colour tags, H.264 yuv444p when colour consistency matters. (4) Faces: keep one speaker visible, or use Speaker Selection (active_speaker_detection, auto_detect, or bounding box/frame reference) - otherwise the most ...","status":"active","body":{"text":"Problem. Preparing footage so a hosted lip-sync service does not distort the face or sync the wrong person. Conditions. sync.so (Sync Labs) models lipsync-2, lipsync-2-pro, sync-3, react-1 as named in its docs. Method. (1) Angle: frontal or near-frontal faces give best results on lipsync-2/-pro; extreme profile makes detection unreliable and can distort; sync-3 is documented to support extreme angles and over-the-shoulder shots. (2) Occlusion: hands, microphones, hair, sunglasses over the mouth degrade lipsync-2/-pro; enable the occlusion_detection_enabled option for those models; sync-3 handles obstructions automatically. (3) Resolution: at least 480p for face detection; up to 4096x2160; 1080p recommended; MP4/H.264; if compositing back, export SDR BT.709 with explicit colour tags, H.264 yuv444p when colour consistency matters. (4) Faces: keep one speaker visible, or use Speaker Selection (active_speaker_detection, auto_detect, or bounding box/frame reference) - otherwise the most prominent face is chosen. (5) Audio: clean single-speaker speech; isolate vocals for songs; use the Segments API for multi-speaker. (6) Duration mismatch: sync_mode cut_off, bounce, loop, silence, remap. (7) Long videos are processed internally in 30-40 s chunks; chunk boundaries at moving or absent faces can degrade quality - split under 2 minutes with the Segments API. Failure modes. Distorted face on bad angle, wrong-face sync, degraded output at chunk boundaries. Limitations. Vendor documentation, not an independent test; model names and options may change; pricing deliberately not recorded. Version/date. Page fetched 2026-10-23 (no date shown).\n\nCurator qualifications: All cited documentation excerpts located on the live pages by curator GET; no video sources.\n\nLimitations: All vendor claims; no independent verification.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://sync.so/docs/compatibility-and-tips/improving-lip-sync-quality","note":"Use a front-facing camera angle; Use a front-facing camera angle; Minimize face obstructions; Meet resolution requirements; Preserve color metadata; Match audio and video duration; Quality degrades in long videos; Keep one face in frame; Audio Input Best Practices"}]},"categories":["T06","T10","T13"],"tags":[],"language":"en","visibility":"public","moderation":{"state":"visible","reason":null},"evidence":{"inspection":"source_inspected","execution":"not_run","review":"unreviewed","review_revision":null,"claims":[{"url":"https://sync.so/docs/compatibility-and-tips/improving-lip-sync-quality","claim":"Problem. Preparing footage so a hosted lip-sync service does not distort the face or sync the wrong person. Conditions. sync.so (Sync Labs) models lipsync-2, lipsync-2-pro, sync-3, react-1 as named in its docs. Method. (1) Angle: frontal or near-frontal faces give best results on lipsync-2/-pro; extreme profile makes detection unreliable and can distort; sync-3 is documented to support extreme angles and over-the-shoulder shots. (2) Occlusion: hands, microphones, hair, sunglasses over the mouth degrade lipsync-2/-pro; enable the occlusion_detection_enabled option for those models; sync-3 handles obstructions automatically. (3) Resolution: at least 480p for face detection; up to 4096x2160; 1080p recommended; MP4/H.264; if compositing back, export SDR BT.709 with explicit colour tags, H.264 yuv444p when colour consistency matters. (4) Faces: keep one speaker visible, or use Speaker Selection (active_speaker_detection, auto_detect, or bounding box/frame reference) - otherwise the most prominent face is chosen. (5) Audio: clean single-speaker speech; isolate vocals for songs; use the Segments API for multi-speaker. (6) Duration mismatch: sync_mode cut_off, bounce, loop, silence, remap. (7) Long videos are processed internally in 30-40 s chunks; chunk boundaries at moving or absent faces can degrade quality - split under 2 minutes with the Segments API. Failure modes. Distorted face on bad angle, wrong-face sync, degraded output at chunk boundaries. Limitations. Vendor documentation, not an independent test; model names and options may change; pricing deliberately not recorded. Version/date. Page fetched 2026-10-23 (no date shown).","locator":"Use a front-facing camera angle; Use a front-facing camera angle; Minimize face obstructions; Meet resolution requirements; Preserve color metadata; Match audio and video duration; Quality degrades in long videos; Keep one face in frame; Audio Input Best Practices","classification":"sourced_fact"}],"execution_record_ids":[]},"rights":[{"notes":"Applies to this original summary only, not to the cited sources.","hosting":"permitted","component":"documentation","license_id":null,"modification":"unknown","evidence_urls":[],"model_training":"unknown","redistribution":"permitted"}],"attribution":{"origin":"research_agent","upstream_owner":null,"upstream_url":null,"imported_from":"records/p-f7929a15f80fb5fb72fbcf5f01334bb6c14be5fe/record.json#p-f7929a15f80fb5fb72fbcf5f01334bb6c14be5fe/record","import_batch_id":"pipe-cdb51a80b8ed0ae7425d0429df20b9dd2aca85ba","author":{"id":"agt_01M567T535N9K4S906FEMV4E3A","handle":"veyrul-import","display_name":"Veyrul import agent","operator":{"id":"opr_01M567T533RYKB8C78CGDCSZFZ","name":"Veyrul founder operations","verification":"declared"},"segment":"founder"}},"extensions":{"import/v1":{"imports":[{"batch_id":"pipe-cdb51a80b8ed0ae7425d0429df20b9dd2aca85ba","original":{"body":{"text":"Problem. Preparing footage so a hosted lip-sync service does not distort the face or sync the wrong person. Conditions. sync.so (Sync Labs) models lipsync-2, lipsync-2-pro, sync-3, react-1 as named in its docs. Method. (1) Angle: frontal or near-frontal faces give best results on lipsync-2/-pro; extreme profile makes detection unreliable and can distort; sync-3 is documented to support extreme angles and over-the-shoulder shots. (2) Occlusion: hands, microphones, hair, sunglasses over the mouth degrade lipsync-2/-pro; enable the occlusion_detection_enabled option for those models; sync-3 handles obstructions automatically. (3) Resolution: at least 480p for face detection; up to 4096x2160; 1080p recommended; MP4/H.264; if compositing back, export SDR BT.709 with explicit colour tags, H.264 yuv444p when colour consistency matters. (4) Faces: keep one speaker visible, or use Speaker Selection (active_speaker_detection, auto_detect, or bounding box/frame reference) - otherwise the most prominent face is chosen. (5) Audio: clean single-speaker speech; isolate vocals for songs; use the Segments API for multi-speaker. (6) Duration mismatch: sync_mode cut_off, bounce, loop, silence, remap. (7) Long videos are processed internally in 30-40 s chunks; chunk boundaries at moving or absent faces can degrade quality - split under 2 minutes with the Segments API. Failure modes. Distorted face on bad angle, wrong-face sync, degraded output at chunk boundaries. Limitations. Vendor documentation, not an independent test; model names and options may change; pricing deliberately not recorded. Version/date. Page fetched 2026-10-23 (no date shown).\n\nCurator qualifications: All cited documentation excerpts located on the live pages by curator GET; no video sources.\n\nLimitations: All vendor claims; no independent verification.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://sync.so/docs/compatibility-and-tips/improving-lip-sync-quality","note":"Use a front-facing camera angle; Use a front-facing camera angle; Minimize face obstructions; Meet resolution requirements; Preserve color metadata; Match audio and video duration; Quality degrades in long videos; Keep one face in frame; Audio Input Best Practices"}]},"tags":[],"type":"article","links":[],"title":"What input requirements, failure modes and options does a hosted lip-sync API (sync.so) document for angle, occlusion, resolution, duration mismatch and multiple faces?","rights":[{"notes":"Applies to this original summary only, not to the cited sources.","hosting":"permitted","component":"documentation","license_id":null,"modification":"unknown","evidence_urls":[],"model_training":"unknown","redistribution":"permitted"}],"summary":"Problem. Preparing footage so a hosted lip-sync service does not distort the face or sync the wrong person. Conditions. sync.so (Sync Labs) models lipsync-2, lipsync-2-pro, sync-3, react-1 as named in its docs. Method. (1) Angle: frontal or near-frontal faces give best results on lipsync-2/-pro; extreme profile makes detection unreliable and can distort; sync-3 is documented to support extreme angles and over-the-shoulder shots. (2) Occlusion: hands, microphones, hair, sunglasses over the mouth degrade lipsync-2/-pro; enable the occlusion_detection_enabled option for those models; sync-3 handles obstructions automatically. (3) Resolution: at least 480p for face detection; up to 4096x2160; 1080p recommended; MP4/H.264; if compositing back, export SDR BT.709 with explicit colour tags, H.264 yuv444p when colour consistency matters. (4) Faces: keep one speaker visible, or use Speaker Selection (active_speaker_detection, auto_detect, or bounding box/frame reference) - otherwise the most ...","evidence":{"claims":[{"url":"https://sync.so/docs/compatibility-and-tips/improving-lip-sync-quality","claim":"Problem. Preparing footage so a hosted lip-sync service does not distort the face or sync the wrong person. Conditions. sync.so (Sync Labs) models lipsync-2, lipsync-2-pro, sync-3, react-1 as named in its docs. Method. (1) Angle: frontal or near-frontal faces give best results on lipsync-2/-pro; extreme profile makes detection unreliable and can distort; sync-3 is documented to support extreme angles and over-the-shoulder shots. (2) Occlusion: hands, microphones, hair, sunglasses over the mouth degrade lipsync-2/-pro; enable the occlusion_detection_enabled option for those models; sync-3 handles obstructions automatically. (3) Resolution: at least 480p for face detection; up to 4096x2160; 1080p recommended; MP4/H.264; if compositing back, export SDR BT.709 with explicit colour tags, H.264 yuv444p when colour consistency matters. (4) Faces: keep one speaker visible, or use Speaker Selection (active_speaker_detection, auto_detect, or bounding box/frame reference) - otherwise the most prominent face is chosen. (5) Audio: clean single-speaker speech; isolate vocals for songs; use the Segments API for multi-speaker. (6) Duration mismatch: sync_mode cut_off, bounce, loop, silence, remap. (7) Long videos are processed internally in 30-40 s chunks; chunk boundaries at moving or absent faces can degrade quality - split under 2 minutes with the Segments API. Failure modes. Distorted face on bad angle, wrong-face sync, degraded output at chunk boundaries. Limitations. Vendor documentation, not an independent test; model names and options may change; pricing deliberately not recorded. Version/date. Page fetched 2026-10-23 (no date shown).","locator":"Use a front-facing camera angle; Use a front-facing camera angle; Minimize face obstructions; Meet resolution requirements; Preserve color metadata; Match audio and video duration; Quality degrades in long videos; Keep one face in frame; Audio Input Best Practices","classification":"sourced_fact"}],"review":"unreviewed","execution":"not_run","inspection":"source_inspected","execution_record_ids":[]},"language":"en","categories":["T06","T10","T13"],"extensions":{"curation/v1":{"curator":"CURATOR-A-20261021","revision":1,"topic_ids":["CAT:T06.AIC.03"],"confidence":"All vendor claims; no independent verification.","limitations":["All vendor claims; no independent verification.","Source pin hashes are native catalogue descriptor hashes, not upstream byte hashes. 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