{"observation":{"id":"01bbcafd-073a-4207-842a-549c9dcf2858","tool":"descript","tool_name":"Descript","criterion":"variant-usefulness","criterion_name":"Variant Usefulness","criterion_definition":"Multiple output variants add real value rather than just multiplying low-quality results.","criterion_evidence_type":"transformation","criterion_rank_role":"context","criterion_rank_role_reason":"Multiple variants can help pick a better result, but they do not by themselves prove the tool adds better sound effects. (3 of 3 judges)","scenario":"bird-nature-video","scenario_name":"Bird/Nature Video","group_tag":"auto-sfx-video-generation","scenario_description":"A video featuring a bird in frame, used to test whether generated chirping or ambient sounds sync to the specific animal and movement shown on screen.","modality":"video","input_text":null,"input_artifact_refs":[],"stresses":["sync accuracy to a visible subject","nature/animal sound matching","avoiding generic ambience that ignores timing","scene-specific audio generation"],"verdict":"mixed","score":null,"score_total":null,"note":"When the bird species is ambiguous, the tool can generate four distinct chirp variants (generic bird chirping, birds chirping, tropical birds, morning birds), which adds some choice, but none of the variants fixes the temporal mismatch.","evidence_state":"verified","source":null,"artifacts":[{"url":"https://d3epheqghktydj.cloudfront.net/descript-descript-bird-chirping-output-1-010b2e8aa8d8.mp4","role":"output","alt":null}],"run_id":"90451942-9055-4e8c-85e6-17c773437ed7","study_title":"Automatically Add Relevant Sound Effects to Videos","study_kind":"generation","research_task":"86b84w3x5","tested_at":null,"completeness":"output-only","input":{"state":"not-captured","text":null,"files":[],"modality":"video","stresses":["sync accuracy to a visible subject","nature/animal sound matching","avoiding generic ambience that ignores timing","scene-specific audio generation"]},"tool_page_slug":"descript","tool_url":"https://aidemos.com/tools/descript","permalink":"https://aidemos.com/evidence/01bbcafd-073a-4207-842a-549c9dcf2858","api_url":"https://ai.aidemos.com/v1/observations/01bbcafd-073a-4207-842a-549c9dcf2858"},"peers":[{"id":"155aa78a-cdb6-47d7-bec1-215e9b885c2b","tool":"kling-ai","tool_name":"Kling AI","verdict":"mixed","score":null,"score_total":null,"note":"The fourth variant can be only marginally better than the others, so the extra variants provide limited benefit.","artifact_count":5,"thumbnail":"https://d3epheqghktydj.cloudfront.net/research-media-bird-88b167f7f533.mp4","evidence_url":"https://aidemos.com/evidence/155aa78a-cdb6-47d7-bec1-215e9b885c2b"},{"id":"9e609120-c682-42f3-8f2c-210b3f02e0db","tool":"mirelo","tool_name":"Mirelo","verdict":"mixed","score":null,"score_total":null,"note":"Generating four variants adds real value because one can be excellent, but the quality spread means users still have to inspect and compare all outputs to find the best one.","artifact_count":5,"thumbnail":"https://d3epheqghktydj.cloudfront.net/research-media-bird-88b167f7f533.mp4","evidence_url":"https://aidemos.com/evidence/9e609120-c682-42f3-8f2c-210b3f02e0db"}],"other_criteria":[{"id":"ea14f7df-bcae-4c53-af53-bc37821e7b99","criterion":"sync-accuracy","criterion_name":"Sync Accuracy","rank_role":"decisive","verdict":"failed","score":null,"score_total":null,"note":"On the bird test, the tool failed to sync sound to the animal's actual behavior, playing bird chirping continuously for the full 10-second clip even though the bird chirped only 2–3 times.","artifact_count":1,"evidence_url":"https://aidemos.com/evidence/ea14f7df-bcae-4c53-af53-bc37821e7b99"}],"appears_in":[{"page_type":"ranking","slug":"ai-sound-effect-generators","title":"Best AI Tools to Automatically Add Sound Effects to Videos","url":"https://aidemos.com/best/ai-sound-effect-generators","binding":"run"},{"page_type":"tool","slug":"fine-voice","title":null,"url":"https://aidemos.com/tools/fine-voice","binding":"run"},{"page_type":"tool","slug":"flexclip","title":null,"url":"https://aidemos.com/tools/flexclip","binding":"run"},{"page_type":"tool","slug":"kling-ai","title":null,"url":"https://aidemos.com/tools/kling-ai","binding":"run"},{"page_type":"tool","slug":"mirelo","title":null,"url":"https://aidemos.com/tools/mirelo","binding":"run"}],"same_scenario":[{"id":"155aa78a-cdb6-47d7-bec1-215e9b885c2b","tool":"kling-ai","tool_name":"Kling AI","verdict":"mixed","score":null,"score_total":null,"note":"The fourth variant can be only marginally better than the others, so the extra variants provide limited benefit."},{"id":"9e609120-c682-42f3-8f2c-210b3f02e0db","tool":"mirelo","tool_name":"Mirelo","verdict":"mixed","score":null,"score_total":null,"note":"Generating four variants adds real value because one can be excellent, but the quality spread means users still have to inspect and compare all outputs to find the best one."}]}