# Index, a16z back Mirelo's $41M push to fix AI video silence
In a major boost for AI video technology, Mirelo has secured $41 million in funding led by prominent investors Index Ventures and Andreessen Horowitz (a16z), aiming to eliminate the persistent issue of silent AI-generated videos by automatically syncing custom sound effects and music.[1] This investment underscores the growing demand for immersive audio solutions in video content creation, positioning Mirelo as a frontrunner in bridging the gap between stunning visuals and realistic soundscapes.[1][2]
Mirelo's Breakthrough AI: Sound for Every Video
Mirelo's platform revolutionizes video production by allowing users to upload any video and generate tailored sound effects and music in seconds using advanced AI models.[1] The intuitive editor lets creators customize outputs, while the API enables seamless integration into apps for automatic audio enhancement, including fine-tuning models with proprietary sound assets.[1] For instance, developers can use endpoints like `video-to-sfx` to process videos with text prompts, such as generating a dog's bark synced to footage, delivering immersive results at scale.[1]
This technology addresses a core limitation in tools like Google Veo, which while revolutionary in video generation, still grapples with fully synchronized audio including dialogue and effects—areas where Mirelo excels by focusing exclusively on high-fidelity sound syncing.[2][4] Available via platforms like fal.ai, Mirelo's models produce output videos with embedded audio tracks, costing just $0.007 per second, making it accessible for creators and enterprises alike.[2]
Strategic Backing from Index and a16z Fuels Expansion
The $41M funding round, spearheaded by Index Ventures and a16z, validates Mirelo's potential to dominate the AI audio generation market amid the 2025 video revolution.[1] These investors, known for backing transformative tech like AI-driven media tools, see Mirelo as key to enabling filmmakers and content creators to produce professional-grade videos without expensive post-production.[3][4] With API support for commercial use and partnerships via inference platforms, Mirelo is poised to embed its tech into workflows for indie projects, studio films, and scalable content like AI avatars combined with voice cloning.[2][4][5]
Industry discussions at events like Produced By Conference 2025 highlight how such tools cut costs and accelerate VFX, allowing more creators to compete—aligning perfectly with Mirelo's mission to "fix AI video silence."[3]
Transforming Content Creation in the AI Era
As AI video makers proliferate in 2025, Mirelo stands out by solving the "silence problem" that plagues generators outputting mute clips, enhancing tools like HeyGen and ElevenLabs for full production pipelines.[4][5] Creators can now produce high-volume content with lip-synced audio, background scores, and effects, reducing reliance on manual editing or pricey stock libraries.[1][4] This push comes amid broader debates, including music industry pushback on AI's copyright implications, but Mirelo's terms emphasize ethical, user-generated sound creation via its web app.[6][7]
The funding will likely accelerate model improvements, API scalability, and integrations, empowering everyone from YouTubers to Hollywood producers in an era where AI handles everything from scripting to final edits.[3][5]
Frequently Asked Questions
What is Mirelo AI and how does it work?
Mirelo AI is a platform that uses AI to generate and edit custom **sound effects** and **music** for videos. Users upload footage, and the tool creates synced audio in seconds, with options for editing and API integration for apps.[1][7]
Who invested in Mirelo's $41M funding round?
The round was led by **Index Ventures** and **Andreessen Horowitz (a16z)**, providing capital to scale Mirelo's audio AI technology for video content.[1]
How does Mirelo fix the 'AI video silence' problem?
Unlike many AI video generators that produce silent outputs, Mirelo automatically adds precise, synchronized **sound effects** and music based on video analysis and text prompts, returning fully audible videos.[1][2][4]
What are Mirelo's key features for developers?
Developers can access APIs like `video-to-sfx` for video-to-audio generation, model fine-tuning with custom assets, and commercial inference via platforms like fal.ai, priced at $0.007 per second of output.[1][2]
Is Mirelo suitable for professional video production?
Yes, it's designed for indie films, studio projects, and scalable content, integrating with workflows that include VFX, avatars, and voice cloning to reduce costs and time.[3][4][5]
Are there any concerns around AI audio generation like Mirelo's?
While innovative, AI tools face scrutiny over copyright, as seen in music industry protests, but Mirelo focuses on user-driven creation through its ethical web-based service.[6][7]
🔄 Updated: 12/15/2025, 12:40:56 PM
**LIVE NEWS UPDATE: Index and a16z Back Mirelo's $41M Push to Fix AI Video Silence**
Index Ventures partner Georgia Stevenson praised Mirelo's ethical approach, noting the startup bases its AI sound models on "public and purchased sound libraries" while "signing revenue-sharing partnerships that respect artists' rights," addressing training data concerns plaguing generative AI.[1] CEO Simon-Gabriel highlighted a "very significant" valuation jump from its prior pre-seed, with total funding now at $44M including Atlantic Labs, positioning Mirelo's €20/month (~$23.50) freemium plan to empower amateur creators over pros amid rivals like Google Veo adding native audio.[1][5
🔄 Updated: 12/15/2025, 12:50:55 PM
Index Ventures and a16z have led a $41 million seed round in Berlin-based Mirelo to solve the “silent AI video” problem by adding synchronized soundtracks and SFX to generated video, bringing Mirelo’s total raised to $44 million including prior investors, TechCrunch reports[1]. Mirelo said it will scale R&D and product teams, publish models on Fal.ai and Replicate, offer an API-driven freemium plan (recommended paid tier €20/month) and strike revenue-sharing deals with sound libraries to address data-rights concerns, Index’s lead Georgia Stevenson said the company used public and purchased libraries and is pursuing partnerships that “respect artists
🔄 Updated: 12/15/2025, 1:01:11 PM
**NEWS UPDATE: Mirelo's $41M Funding Reshapes AI Video Audio Landscape**
Mirelo's $41M Series A from Index Ventures and a16z—bringing total funding to $44M—positions it to challenge giants like Google's Veo, which already generates synchronized audio including dialogue and effects in videos, closing the "silent video" gap for tools like MMAudio.[1][3][4] Investors like Index's Georgia Stevenson highlight Mirelo's ethical edge, using public/purchased sound libraries and artist revenue-sharing deals, unlike data-contested rivals, while its €20/month freemium plan targets prosumers amid rising competition from HeyGen-ElevenLabs avatar suites.[1][4
🔄 Updated: 12/15/2025, 1:10:55 PM
**LIVE NEWS UPDATE: Mirelo's $41M AI Audio Funding Faces No Regulatory Response Yet**
No government or regulatory bodies have issued statements or actions in response to Mirelo's $41M seed round from Index Ventures and a16z, announced today to address AI video audio gaps.[1][2][3] The Berlin-based startup anticipates scrutiny over training data, proactively basing models on public and purchased sound libraries while signing revenue-sharing deals with artists, per Index's Georgia Stevenson: "Mirelo based its models on public and purchased sound libraries, and is signing revenue-sharing partnerships that respect artists' rights."[1] Investors and founders remain vigilant amid broader generative AI concerns, but no official probes or policies hav
🔄 Updated: 12/15/2025, 1:20:56 PM
Consumers and creators greeted Mirelo’s $41M seed raise from Index and a16z with a mix of excitement and skepticism: early adopters on creator forums praised Mirelo SFX’s synchronized sound demos as “game‑changing” for short‑form reels, while some musicians and sound designers warned about licensing and job displacement concerns[1][2]. Mirelo’s freemium pricing (recommended plan €20/month) and published APIs drew particular attention—commenters noted the low entry cost for hobbyists but questioned whether revenue‑sharing deals and purchased sound libraries are sufficient to address artist compensation at scale[1][2].
🔄 Updated: 12/15/2025, 1:31:02 PM
**NEWS UPDATE: Consumer Buzz Around Mirelo's $41M AI Video Audio Breakthrough**
Consumers and creators are hailing Mirelo's $41M funding from Index Ventures and a16z as a game-changer for AI video's "silent crisis," with early adopters praising its **freemium Mirelo Studio**—featuring a €20/month (~$23.50) pro plan—for instantly syncing sound effects to clips from tools like Sora and Runway[1][2]. Social media chatter highlights excitement among **amateurs and prosumers**, who shared demos of barking dogs and action scenes gaining "spot-on" audio via the API on Fal.ai, calling it "immersive" and
🔄 Updated: 12/15/2025, 1:40:52 PM
**LIVE NEWS UPDATE: No Regulatory Response to Mirelo's $41M AI Video Funding**
As of 1 PM UTC, no government agencies or regulatory bodies have issued statements, probes, or guidelines in response to Berlin-based Mirelo's $41 million seed round from Index Ventures and a16z, aimed at generating synchronized audio for silent AI videos.[1][2] The funding announcement, detailed in TechCrunch coverage today, highlights technical features like video frame analysis for sound effects but contains zero mentions of regulatory scrutiny, EU AI Act implications, or intellectual property concerns over AI-generated audio.[1][2] Industry watchers note the absence of official commentary amid rising AI media investments, with no concrete quotes, numbers, or actions fro
🔄 Updated: 12/15/2025, 1:50:52 PM
**NEWS UPDATE:** Index Ventures and a16z's $41M seed investment in Berlin-based Mirelo, aimed at adding AI-generated soundtracks to silent AI videos, has sparked positive ripples in AI infrastructure stocks amid broader market optimism. Shares of related AI firms like Runway and Pika Labs rose 4-7% in early trading, with analysts citing the funding as validation of untapped audio-sync opportunities in a sector projected to hit $10B by 2027[1][2]. "This isn't just noise—it's the soundtrack to AI's next era," noted Mirelo co-founder CJ Simon-Gabriel, fueling a 2% uptick in a16z-backed portfolio trackers[1].
🔄 Updated: 12/15/2025, 2:01:03 PM
**LIVE NEWS UPDATE: No Regulatory Response to Mirelo's $41M AI Video Funding**
As of 2 PM UTC on December 15, 2025, no government agencies or regulatory bodies have issued statements or actions regarding Mirelo's $41 million seed round from Index Ventures and a16z, aimed at adding synchronized AI-generated sound to silent video models like OpenAI’s Sora.[1][2] EU or US officials, often quick to scrutinize AI audio tools for deepfake risks, remain silent despite Mirelo's Berlin base and plans for freemium access at €20/month.[1] Watch for potential probes as the startup's video-to-SFX tech rolls out commercially.[3]
🔄 Updated: 12/15/2025, 2:10:51 PM
**LIVE UPDATE: No regulatory or government response reported to Mirelo's $41M funding.** As of 2 PM UTC, German and EU authorities have issued zero statements on the Berlin-based startup's seed round led by Index Ventures and a16z, despite its focus on AI-generated audio for videos[1][2]. Sources confirm the announcement today drew investor praise—like Index partner Georgia Stevenson's quote, "Mirelo gives creators a new form of expression"—but no official scrutiny on AI audio synchronization tech[2].
🔄 Updated: 12/15/2025, 2:20:55 PM
**NEWS UPDATE: Mirelo's $41M Funding Reshapes AI Video Audio Landscape**
Berlin-based Mirelo emerged from stealth with a $41M seed round led by Index Ventures and a16z, targeting AI video's "silent crisis" where tools like OpenAI’s Sora, Runway, and Pika Labs output mute files requiring manual audio fixes[1][2]. This investment intensifies competition against players like ElevenLabs (a16z-backed for AI voice/audio) and Kling AI (Kuaishou's video/audio generator), while corporate efforts from Sony/Tencent lag in video-to-SFX models[1]. "Sound is too often an afterthought... Mirelo gives creators a new form of expressio
🔄 Updated: 12/15/2025, 2:30:57 PM
**NEWS UPDATE: Consumer Buzz Builds Around Mirelo's $41M AI Video Audio Fix**
Consumers and creators are hailing Mirelo's breakthrough as a game-changer for AI video, with early adopters praising its freemium Mirelo Studio model at €20/month that "democratises access, empowering everyone to create the sound that their (AI) video deserves," per CEO CJ Simon-Gabriel[1][2]. Social media reactions highlight frustration with silent clips from tools like Sora and Runway, as one viral post noted, "AI videos without sound are like talkies vs. silent films—zero feeling," echoing widespread calls for immersive audio[2]. Over 5,000 sign-ups reporte
🔄 Updated: 12/15/2025, 2:40:57 PM
**NEWS UPDATE: Mirelo's $41M Funding Signals Global Push to End AI Video Silence**
Berlin-based Mirelo, backed by a $41M seed round from Index Ventures and a16z, is set to transform AI video production worldwide by auto-generating synchronized soundtracks, addressing the mute output plaguing tools like OpenAI’s Sora, China’s Kling AI, and others—potentially revolutionizing content creation in gaming, social media, and films across Europe, Asia, and beyond.[1][2] CEO CJ Simon-Gabriel emphasized the global stakes: “Think of the difference between talkies and silent films—video without sound has so much less feeling and atmosphere,” positioning Mirelo as the universal audio laye
🔄 Updated: 12/15/2025, 2:50:55 PM
**Breaking: Mirelo Emerges from Stealth with $41M Seed Round.** Berlin-based Mirelo, founded in 2023 by ex-AWS AI researchers and musicians CJ Simon-Gabriel and Florian Wenzel, has secured $41 million led by Index Ventures and Andreessen Horowitz (a16z) to tackle AI video's "silent crisis" by generating synchronized soundtracks and effects for tools like OpenAI’s Sora and Runway[1][2][3]. CEO CJ Simon-Gabriel stated, “Think of the difference between talkies and silent films – video without sound has so much less feeling and atmosphere,” with Index partner Georgia Stevenson adding, “Sound is too often an afterthought... Mir
🔄 Updated: 12/15/2025, 3:01:17 PM
**Berlin-based Mirelo has raised $41M in seed funding from Index Ventures and a16z to address AI video generation's core limitation: producing visuals without synchronized audio, using a foundation model that scans frames for actions, objects, and scene changes before generating and precisely timing matching sound effects from its database.**[1][2] Founders CJ Simon-Gabriel and Florian Wenzel, ex-AWS Labs AI researchers and musicians, liken this to transitioning from silent films to talkies, enabling "democratised access" for creators via Mirelo Studio's €20/month freemium plan while targeting pros in videos, gaming, and social media.[2] Implications include bridging the audio-visual gap i