{"observation":{"id":"9e609120-c682-42f3-8f2c-210b3f02e0db","tool":"mirelo","tool_name":"Mirelo","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":"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.","evidence_state":"verified","source":null,"artifacts":[{"url":"https://d3epheqghktydj.cloudfront.net/research-media-bird-88b167f7f533.mp4","role":"input","alt":null},{"url":"https://d3epheqghktydj.cloudfront.net/mirelo-mirelo-bird-chirping-output-1-3da3cde849d8.mp4","role":"output","alt":null},{"url":"https://d3epheqghktydj.cloudfront.net/mirelo-mirelo-bird-chirping-output-2-6c1c9d644647.mp4","role":"output","alt":null},{"url":"https://d3epheqghktydj.cloudfront.net/mirelo-mirelo-bird-chirping-output-3-2b1a3d0df441.mp4","role":"output","alt":null},{"url":"https://d3epheqghktydj.cloudfront.net/mirelo-mirelo-bird-chirping-output-4-ebf1cf6ae1cf.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":"mirelo","tool_url":"https://aidemos.com/tools/mirelo","permalink":"https://aidemos.com/evidence/9e609120-c682-42f3-8f2c-210b3f02e0db","api_url":"https://ai.aidemos.com/v1/observations/9e609120-c682-42f3-8f2c-210b3f02e0db"},"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":"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"}],"other_criteria":[{"id":"7ac7183a-f437-40c1-920d-6df6d2e6139f","criterion":"audio-quality","criterion_name":"Audio Quality","rank_role":"decisive","verdict":"worked","score":null,"score_total":null,"note":"Its background music can sound consistently good across variants, giving the outputs a polished and listenable audio bed.","artifact_count":5,"evidence_url":"https://aidemos.com/evidence/7ac7183a-f437-40c1-920d-6df6d2e6139f"},{"id":"adebf690-533d-42f6-ae7f-b0b7a2beeb85","criterion":"dialogue-and-music-balance","criterion_name":"Dialogue & Music Balance","rank_role":"context","verdict":"worked","score":null,"score_total":null,"note":"Generated effects can stay out of the way of an existing music bed, so the music remains intact instead of being overpowered by the SFX layer.","artifact_count":5,"evidence_url":"https://aidemos.com/evidence/adebf690-533d-42f6-ae7f-b0b7a2beeb85"},{"id":"ca5e96ac-9daa-4c14-8802-ce585f999b45","criterion":"layering-consistency","criterion_name":"Layering Consistency","rank_role":"decisive","verdict":"worked","score":null,"score_total":null,"note":"The tool can stack generated background music with sound effects smoothly enough that the layers do not conflict.","artifact_count":5,"evidence_url":"https://aidemos.com/evidence/ca5e96ac-9daa-4c14-8802-ce585f999b45"},{"id":"8edf5ecc-9e2f-40ad-98a9-b81a4dd468bf","criterion":"sync-accuracy","criterion_name":"Sync Accuracy","rank_role":"decisive","verdict":"worked","score":null,"score_total":null,"note":"It can achieve near-perfect timing on natural footage; one variant was reported as so accurately synced that the sound effects seemed like part of the video.","artifact_count":2,"evidence_url":"https://aidemos.com/evidence/8edf5ecc-9e2f-40ad-98a9-b81a4dd468bf"}],"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":"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."}]}