{"observation":{"id":"208b6f87-9f13-44c4-9f3c-652edc37f2c7","tool":"dubverse","tool_name":"Dubverse","criterion":"lip-sync-accuracy","criterion_name":"Lip Sync Accuracy","criterion_definition":"Does the dubbed audio visually match lip movements in the original video?","criterion_evidence_type":"transformation","criterion_rank_role":"decisive","criterion_rank_role_reason":"If the dubbed audio does not match the on-screen mouth movements, the core purpose of video translation with lip sync has failed. (3 of 3 judges)","scenario":"hindi-vlog-style-talking-head-hindi-english","scenario_name":"Hindi vlog-style talking head (Hindi → English)","group_tag":"video-translation-voice-clone-lip-sync","scenario_description":"A casual Hindi/Hinglish talking-head or vlog-style creator video translated into English to stress informal language handling, slang, and natural-sounding voice cloning on real creator content.","modality":"video","input_text":null,"input_artifact_refs":[],"stresses":[],"verdict":"mixed","score":null,"score_total":null,"note":"Lip sync is good on slow to medium speech, but fast instruction segments show a slight delay.","evidence_state":"verified","source":"first-party","artifacts":[{"url":"https://d3epheqghktydj.cloudfront.net/dubverse-hindi-dubverse-ai.mp4","role":"output","alt":"Dubverse — Hindi- dubverse.ai.mp4"}],"run_id":"9feca581-b454-4bda-a610-a646cd0092f0","study_title":"Translate Videos with Voice Cloning and Lip Sync Using AI","study_kind":"backfill","research_task":"86b96dfpf","tested_at":"2026-06-24T05:45:24.018000+00:00","completeness":"output-only","input":{"state":"not-captured","text":null,"files":[],"modality":"video","stresses":[]},"tool_page_slug":"dubverse","tool_url":"https://aidemos.com/tools/dubverse","permalink":"https://aidemos.com/evidence/208b6f87-9f13-44c4-9f3c-652edc37f2c7","api_url":"https://ai.aidemos.com/v1/observations/208b6f87-9f13-44c4-9f3c-652edc37f2c7"},"peers":[{"id":"e915c864-064b-4912-b5bf-82f198756b50","tool":"d-id","tool_name":"D-ID","verdict":"failed","score":null,"score_total":null,"note":"Lip sync only matched the generated AI avatar; the tool does not lip-sync the original fitness footage.","artifact_count":2,"thumbnail":"https://d3epheqghktydj.cloudfront.net/d-id-input-1-fitness-video-online-video-cutter-com.mp4","evidence_url":"https://aidemos.com/evidence/e915c864-064b-4912-b5bf-82f198756b50"},{"id":"19111e13-9d4e-4f30-8535-be7a2d3b92c9","tool":"elevenlabs","tool_name":"ElevenLabs","verdict":"failed","score":null,"score_total":null,"note":"No lip-sync feature was provided, so the dubbing could not automatically match the original Hindi mouth movements.","artifact_count":2,"thumbnail":"https://d3epheqghktydj.cloudfront.net/elevenlabs-free-copyright-stock-videos-images-and-music-publer-com-online-video-cutter-com.mp4","evidence_url":"https://aidemos.com/evidence/19111e13-9d4e-4f30-8535-be7a2d3b92c9"},{"id":"3f569910-d750-4754-8623-e5774a7e1ddb","tool":"heygen","tool_name":"Heygen","verdict":"mixed","score":null,"score_total":null,"note":"Lip sync is acceptable, but it weakens on longer sentences.","artifact_count":1,"thumbnail":"https://d3epheqghktydj.cloudfront.net/heygen-input-2-educational.mp4","evidence_url":"https://aidemos.com/evidence/3f569910-d750-4754-8623-e5774a7e1ddb"},{"id":"010b4fd4-e395-46ce-a6f2-8cb1e9a5c86c","tool":"rask-ai","tool_name":"Rask AI","verdict":"mixed","score":null,"score_total":null,"note":"Maintains usable lip sync, but expressive moments can introduce minor inconsistencies and slight breaks in alignment.","artifact_count":1,"thumbnail":"https://d3epheqghktydj.cloudfront.net/rask-ai-free-copyright-stock-videos-images-and-music-publer-com-online-video-cutter-com.mp4","evidence_url":"https://aidemos.com/evidence/010b4fd4-e395-46ce-a6f2-8cb1e9a5c86c"},{"id":"99c929a8-85a1-45db-a74c-9b5616555ccd","tool":"sync-labs","tool_name":"Sync Labs","verdict":"mixed","score":null,"score_total":null,"note":"Lip sync worked overall, but it struggled during expressive facial movements and fast speech.","artifact_count":2,"thumbnail":"https://d3epheqghktydj.cloudfront.net/sync-labs-free-copyright-stock-videos-images-and-music-publer-com-online-video-cutter-com.mp4","evidence_url":"https://aidemos.com/evidence/99c929a8-85a1-45db-a74c-9b5616555ccd"}],"other_criteria":[{"id":"c18440f7-6adf-48f9-90f3-414d6813577e","criterion":"input-handling","criterion_name":"Input Handling","rank_role":"context","verdict":"worked","score":null,"score_total":null,"note":"Accepts direct MP4 video upload, auto-detects clear English speech accurately, and handles single-speaker footage reliably.","artifact_count":1,"evidence_url":"https://aidemos.com/evidence/c18440f7-6adf-48f9-90f3-414d6813577e"},{"id":"75362166-76f4-4c75-b243-038307328f29","criterion":"input-handling","criterion_name":"Input Handling","rank_role":"context","verdict":"worked","score":null,"score_total":null,"note":"Handles structured educational speech very well, with high transcription accuracy on clear narration and no duration-related issues.","artifact_count":2,"evidence_url":"https://aidemos.com/evidence/75362166-76f4-4c75-b243-038307328f29"},{"id":"cfc0e310-db90-4930-82ed-243b691dc0a6","criterion":"input-handling","criterion_name":"Input Handling","rank_role":"context","verdict":"mixed","score":null,"score_total":null,"note":"Accepts casual Hindi speech, but transcription degrades on slang, mixed-language speech, background noise, and weak speaker separation.","artifact_count":1,"evidence_url":"https://aidemos.com/evidence/cfc0e310-db90-4930-82ed-243b691dc0a6"},{"id":"a8545d36-4f50-4323-ab5f-a5f746d74182","criterion":"translation-accuracy","criterion_name":"Translation Accuracy","rank_role":"decisive","verdict":"mixed","score":null,"score_total":null,"note":"Some fitness-specific terms are not localized naturally, so terminology quality is not fully consistent.","artifact_count":1,"evidence_url":"https://aidemos.com/evidence/a8545d36-4f50-4323-ab5f-a5f746d74182"},{"id":"c6e48d15-5bf1-4813-ba2f-36df4c66c0d7","criterion":"translation-accuracy","criterion_name":"Translation Accuracy","rank_role":"decisive","verdict":"worked","score":null,"score_total":null,"note":"Produces highly accurate English-to-Spanish translation that preserves technical and educational meaning.","artifact_count":2,"evidence_url":"https://aidemos.com/evidence/c6e48d15-5bf1-4813-ba2f-36df4c66c0d7"},{"id":"da6cba81-62ae-4e33-8648-fc9c114fa412","criterion":"translation-accuracy","criterion_name":"Translation Accuracy","rank_role":"decisive","verdict":"mixed","score":null,"score_total":null,"note":"Basic Hindi-to-English translation remains understandable and preserves overall meaning, but struggles with slang and informal tone.","artifact_count":1,"evidence_url":"https://aidemos.com/evidence/da6cba81-62ae-4e33-8648-fc9c114fa412"},{"id":"3ea029b0-9556-4646-858d-2187a56664d0","criterion":"translation-accuracy","criterion_name":"Translation Accuracy","rank_role":"decisive","verdict":"worked","score":null,"score_total":null,"note":"Preserves common fitness terminology accurately when dubbing English to Hindi.","artifact_count":1,"evidence_url":"https://aidemos.com/evidence/3ea029b0-9556-4646-858d-2187a56664d0"},{"id":"dd14eadd-81f4-4232-bd87-165fca55746c","criterion":"voice-cloning-quality","criterion_name":"Voice Cloning Quality","rank_role":"decisive","verdict":"mixed","score":null,"score_total":null,"note":"The generated voice becomes slightly robotic in longer explanations.","artifact_count":2,"evidence_url":"https://aidemos.com/evidence/dd14eadd-81f4-4232-bd87-165fca55746c"},{"id":"204a67c4-fd8a-4339-9dc2-c0222b86249b","criterion":"voice-cloning-quality","criterion_name":"Voice Cloning Quality","rank_role":"decisive","verdict":"mixed","score":null,"score_total":null,"note":"Generates a clean voice with minimal distortion, but the voice lacks the high-energy intensity needed to match an energetic fitness instructor.","artifact_count":1,"evidence_url":"https://aidemos.com/evidence/204a67c4-fd8a-4339-9dc2-c0222b86249b"},{"id":"be692751-8937-4f24-b417-17444353cf60","criterion":"voice-cloning-quality","criterion_name":"Voice Cloning Quality","rank_role":"decisive","verdict":"worked","score":null,"score_total":null,"note":"Produces a natural, professional-sounding voice that fits neutral educational narration.","artifact_count":2,"evidence_url":"https://aidemos.com/evidence/be692751-8937-4f24-b417-17444353cf60"},{"id":"77a4bb1d-c755-4304-9beb-ba18e6ba59c9","criterion":"voice-cloning-quality","criterion_name":"Voice Cloning Quality","rank_role":"decisive","verdict":"struggled","score":null,"score_total":null,"note":"The dubbed voice sounds less natural and slightly robotic, and it does not preserve the speaker's emotion or personality well.","artifact_count":1,"evidence_url":"https://aidemos.com/evidence/77a4bb1d-c755-4304-9beb-ba18e6ba59c9"}],"appears_in":[{"page_type":"ranking","slug":"ai-video-dubbing-tools","title":"Best AI Tools to Translate Videos with Voice Cloning and Lip Sync","url":"https://aidemos.com/best/ai-video-dubbing-tools","binding":"run"}],"same_scenario":[{"id":"e915c864-064b-4912-b5bf-82f198756b50","tool":"d-id","tool_name":"D-ID","verdict":"failed","score":null,"score_total":null,"note":"Lip sync only matched the generated AI avatar; the tool does not lip-sync the original fitness footage."},{"id":"19111e13-9d4e-4f30-8535-be7a2d3b92c9","tool":"elevenlabs","tool_name":"ElevenLabs","verdict":"failed","score":null,"score_total":null,"note":"No lip-sync feature was provided, so the dubbing could not automatically match the original Hindi mouth movements."},{"id":"3f569910-d750-4754-8623-e5774a7e1ddb","tool":"heygen","tool_name":"Heygen","verdict":"mixed","score":null,"score_total":null,"note":"Lip sync is acceptable, but it weakens on longer sentences."},{"id":"010b4fd4-e395-46ce-a6f2-8cb1e9a5c86c","tool":"rask-ai","tool_name":"Rask AI","verdict":"mixed","score":null,"score_total":null,"note":"Maintains usable lip sync, but expressive moments can introduce minor inconsistencies and slight breaks in alignment."},{"id":"99c929a8-85a1-45db-a74c-9b5616555ccd","tool":"sync-labs","tool_name":"Sync Labs","verdict":"mixed","score":null,"score_total":null,"note":"Lip sync worked overall, but it struggled during expressive facial movements and fast speech."}]}