{"observation":{"id":"2ca9115f-592f-404b-ba23-8b8340c23781","tool":"rask-ai","tool_name":"Rask AI","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":"Keeps lip sync fairly close on the original speaker, but minor mismatches appear in fast-speech sections.","evidence_state":"verified","source":"first-party","artifacts":[{"url":"https://d3epheqghktydj.cloudfront.net/rask-ai-input-1-fitness-video-online-video-cutter-com.mp4","role":"input","alt":"Rask AI — Input 1 Fitness Video (online-video-cutter.com).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":"input-only","input":{"state":"not-captured","text":null,"files":[],"modality":"video","stresses":[]},"tool_page_slug":null,"tool_url":null,"permalink":"https://aidemos.com/evidence/2ca9115f-592f-404b-ba23-8b8340c23781","api_url":"https://ai.aidemos.com/v1/observations/2ca9115f-592f-404b-ba23-8b8340c23781"},"peers":[{"id":"d29db857-29b4-4b28-9e92-85d3759bd67f","tool":"d-id","tool_name":"D-ID","verdict":"failed","score":null,"score_total":null,"note":"Lip sync worked well on the AI avatar, but it did not apply to the original video.","artifact_count":1,"thumbnail":"https://d3epheqghktydj.cloudfront.net/d-id-d-id-educationalvideo-en-es-mp4.mp4","evidence_url":"https://aidemos.com/evidence/d29db857-29b4-4b28-9e92-85d3759bd67f"},{"id":"94c02683-3cce-4dc6-be59-1c5eff13ba42","tool":"dubverse","tool_name":"Dubverse","verdict":"failed","score":null,"score_total":null,"note":"Lip sync is the weakest of the tested inputs, with noticeable audio-video mismatch in fast speech parts.","artifact_count":1,"thumbnail":"https://d3epheqghktydj.cloudfront.net/dubverse-english-syncvideo-1-mp4.mp4","evidence_url":"https://aidemos.com/evidence/94c02683-3cce-4dc6-be59-1c5eff13ba42"},{"id":"d3cdcec4-eba0-4bd3-a162-9fe73d634781","tool":"elevenlabs","tool_name":"ElevenLabs","verdict":"failed","score":null,"score_total":null,"note":"Provides no built-in lip sync or video integration, so the dubbed audio cannot visually align with the original mouth movements inside the tool.","artifact_count":2,"thumbnail":"https://d3epheqghktydj.cloudfront.net/elevenlabs-input-1-fitness-video-online-video-cutter-com.mp4","evidence_url":"https://aidemos.com/evidence/d3cdcec4-eba0-4bd3-a162-9fe73d634781"},{"id":"9640f541-5757-44ef-b97a-4acbf459fe62","tool":"heygen","tool_name":"Heygen","verdict":"struggled","score":null,"score_total":null,"note":"Lip sync becomes noticeably less accurate and falls out of alignment in some sections.","artifact_count":1,"thumbnail":"https://d3epheqghktydj.cloudfront.net/heygen-free-copyright-stock-videos-images-and-music-publer-com-online-video-cutter-com.mp4","evidence_url":"https://aidemos.com/evidence/9640f541-5757-44ef-b97a-4acbf459fe62"},{"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":"db314466-a58b-4b6e-88d5-e5eadf04a677","criterion":"translation-accuracy","criterion_name":"Translation Accuracy","rank_role":"decisive","verdict":"worked","score":null,"score_total":null,"note":"Produces accurate, well-structured Spanish translations, especially on educational narration.","artifact_count":1,"evidence_url":"https://aidemos.com/evidence/db314466-a58b-4b6e-88d5-e5eadf04a677"},{"id":"7decd6e5-937e-4340-b01f-89e3f813a6e2","criterion":"translation-accuracy","criterion_name":"Translation Accuracy","rank_role":"decisive","verdict":"mixed","score":null,"score_total":null,"note":"Produces mostly accurate Hindi translations for fast, energetic fitness speech, but the translation is not perfectly faithful in every line.","artifact_count":1,"evidence_url":"https://aidemos.com/evidence/7decd6e5-937e-4340-b01f-89e3f813a6e2"},{"id":"31036f37-92fc-4c90-820e-7140c16b8e6c","criterion":"translation-accuracy","criterion_name":"Translation Accuracy","rank_role":"decisive","verdict":"mixed","score":null,"score_total":null,"note":"Produces mostly accurate English translations, but the output can become slightly too formal for casual vlog language.","artifact_count":1,"evidence_url":"https://aidemos.com/evidence/31036f37-92fc-4c90-820e-7140c16b8e6c"},{"id":"381f65ee-2f6b-4d09-8a31-112747e82211","criterion":"voice-cloning-quality","criterion_name":"Voice Cloning Quality","rank_role":"decisive","verdict":"mixed","score":null,"score_total":null,"note":"Delivers clear voice output, but the dubbed speech lacks emotional depth and sounds less characterful than the source speaker.","artifact_count":1,"evidence_url":"https://aidemos.com/evidence/381f65ee-2f6b-4d09-8a31-112747e82211"},{"id":"5db79a49-a83d-41c0-9632-35eb8312e19e","criterion":"voice-cloning-quality","criterion_name":"Voice Cloning Quality","rank_role":"decisive","verdict":"mixed","score":null,"score_total":null,"note":"Generates a generally natural Hindi dubbed voice, but some passages sound slightly robotic and do not fully capture the speaker's fitness energy or emotion.","artifact_count":1,"evidence_url":"https://aidemos.com/evidence/5db79a49-a83d-41c0-9632-35eb8312e19e"},{"id":"0f2ee47f-ad28-4219-b248-be9132486c45","criterion":"voice-cloning-quality","criterion_name":"Voice Cloning Quality","rank_role":"decisive","verdict":"mixed","score":null,"score_total":null,"note":"Creates a clear English dubbed voice, but it does not fully match the original speaker's personality and can feel generic.","artifact_count":1,"evidence_url":"https://aidemos.com/evidence/0f2ee47f-ad28-4219-b248-be9132486c45"}],"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":"d29db857-29b4-4b28-9e92-85d3759bd67f","tool":"d-id","tool_name":"D-ID","verdict":"failed","score":null,"score_total":null,"note":"Lip sync worked well on the AI avatar, but it did not apply to the original video."},{"id":"94c02683-3cce-4dc6-be59-1c5eff13ba42","tool":"dubverse","tool_name":"Dubverse","verdict":"failed","score":null,"score_total":null,"note":"Lip sync is the weakest of the tested inputs, with noticeable audio-video mismatch in fast speech parts."},{"id":"d3cdcec4-eba0-4bd3-a162-9fe73d634781","tool":"elevenlabs","tool_name":"ElevenLabs","verdict":"failed","score":null,"score_total":null,"note":"Provides no built-in lip sync or video integration, so the dubbed audio cannot visually align with the original mouth movements inside the tool."},{"id":"9640f541-5757-44ef-b97a-4acbf459fe62","tool":"heygen","tool_name":"Heygen","verdict":"struggled","score":null,"score_total":null,"note":"Lip sync becomes noticeably less accurate and falls out of alignment in some sections."},{"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."}]}