{"observation":{"id":"155aa78a-cdb6-47d7-bec1-215e9b885c2b","tool":"kling-ai","tool_name":"Kling AI","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":"The fourth variant can be only marginally better than the others, so the extra variants provide limited benefit.","evidence_state":"verified","source":null,"artifacts":[{"url":"https://d3epheqghktydj.cloudfront.net/research-media-bird-88b167f7f533.mp4","role":"input","alt":"Bird.mp4"},{"url":"https://d3epheqghktydj.cloudfront.net/kling-ai-kling-ai-bird-chirping-output-1-f90f2a2a825f.mp4","role":"output","alt":null},{"url":"https://d3epheqghktydj.cloudfront.net/kling-ai-kling-ai-bird-chirping-output-2-afa2b7a2a1cb.mp4","role":"output","alt":null},{"url":"https://d3epheqghktydj.cloudfront.net/kling-ai-kling-ai-bird-chirping-output-3-4cb15eb669f1.mp4","role":"output","alt":null},{"url":"https://d3epheqghktydj.cloudfront.net/kling-ai-kling-ai-bird-chirping-output-4-561115c82942.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":"input-and-output","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":"kling-ai","tool_url":"https://aidemos.com/tools/kling-ai","permalink":"https://aidemos.com/evidence/155aa78a-cdb6-47d7-bec1-215e9b885c2b","api_url":"https://ai.aidemos.com/v1/observations/155aa78a-cdb6-47d7-bec1-215e9b885c2b"},"peers":[{"id":"01bbcafd-073a-4207-842a-549c9dcf2858","tool":"descript","tool_name":"Descript","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.","artifact_count":1,"thumbnail":"https://d3epheqghktydj.cloudfront.net/descript-descript-bird-chirping-output-1-010b2e8aa8d8.mp4","evidence_url":"https://aidemos.com/evidence/01bbcafd-073a-4207-842a-549c9dcf2858"},{"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":"75407f0b-f13b-4e88-8bc3-8e84da3296a2","criterion":"audio-quality","criterion_name":"Audio Quality","rank_role":"decisive","verdict":"worked","score":null,"score_total":null,"note":"Prompt assistance can make the output audible and improve volume over the no-prompt baseline.","artifact_count":5,"evidence_url":"https://aidemos.com/evidence/75407f0b-f13b-4e88-8bc3-8e84da3296a2"},{"id":"e928b323-df69-4f9f-9042-9d72294d89f2","criterion":"scene-sound-relevance","criterion_name":"Scene-Sound Relevance","rank_role":"decisive","verdict":"struggled","score":null,"score_total":null,"note":"The tool can omit the featured subject’s specific sound at the moment it appears and fall back to generic ambience.","artifact_count":5,"evidence_url":"https://aidemos.com/evidence/e928b323-df69-4f9f-9042-9d72294d89f2"},{"id":"423601f9-0ef6-48b2-8f30-ecbcf9624efe","criterion":"sync-accuracy","criterion_name":"Sync Accuracy","rank_role":"decisive","verdict":"failed","score":null,"score_total":null,"note":"The subject-specific sound can fail to line up with the object’s on-screen behavior.","artifact_count":5,"evidence_url":"https://aidemos.com/evidence/423601f9-0ef6-48b2-8f30-ecbcf9624efe"}],"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":"01bbcafd-073a-4207-842a-549c9dcf2858","tool":"descript","tool_name":"Descript","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."},{"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."}]}