I have a problem with Fal.ai, when I try to use fal-ai/ffmpeg-api/compose I got: {“detail”: “Cannot access application ‘fal-ai/ffmpeg-api’. Authentication is required to access this application.”} I did the request like the instructions in their website but it does not work, how can I fix it?

Hi @Gezer welcome to :n8n: community! Could you please check this post for guidance on successfully adding the fal.ai API to n8n: [image] Fal.ai api key not working Questions Hello @smoshwed Welcome to n8n n8n community tada It looks like you need t…

I did it like that: [image] and the POST URL to: https://queue.fal.run/fal-ai/ffmpeg-api/compose

But it does not, how can I solve it?

Check your FAL account, the APIs, and if possible share the workflow with screenshots of the exact error to help debug the issue..

I have checked the FAL and the APIs, and the flow is like this video: [This AI System Creates BigFoot YouTube Vlogs Hourly (n8n Guide)] from 29:40

I’ve had the same problem, when I check fal.ai requests I saw that body of the request wasn’t right. You need to ensure that u use “expression” not the raw json. It’s how it should be [image] [image] this is wrong body, if u dont use expression

Authentication problem with Fal.ai

Questions

mohamed3nan August 24, 2025, 8:39pm 2

Hi @Gezer welcome to community!

Could you please check this post for guidance on successfully adding the fal.ai API to n8n:

and let me know if you still run into any issues..

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Authentication problem with Fal.ai

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