Auto-edit and post TikTok videos with n8n: Gemini Omni Flash + OpenAI

Input video URL + edit prompt → render via Fal Gemini Omni Flash → generate title with OpenAI → upload to TikTok via Upload-Post

Who

Content creators or ops teams who need to batch-process videos and auto-publish to TikTok

You get

Webhook-triggered pipeline: AI video editing, auto SEO title generation, and auto-upload publishing

You need

n8n

Steps

1. Trigger workflow and submit video editing job

   Configure the Webhook node in n8n with a trigger path. Ensure external calls POST JSON containing `video_url` (source video address) and `prompt` (editing instruction, e.g. "Make this video anime"). Once received, data flows to the Create Video node, which sends a POST to `https://queue.fal.run/google/gemini-omni-flash/edit` with a JSON body containing the prompt and video_url. Add Fal.run API credentials as httpHeaderAuth in n8n Credentials and select them in the node.

   Execution prompt · Source text。Create Video node JSON Body field; enable Send Body, set Specify Body to JSON

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   ={
        "prompt": "{{ $json.prompt }}",
        "video_url": "{{ $json.video_url }}"
      }

2. Poll rendering status until completed

   After Create Video returns, the workflow enters the Wait 60 sec. node, then the Get status node queries Fal.run for job status (GET `https://queue.fal.run/google/gemini-omni-flash/requests/{{request_id}}/status`). The Completed? node checks if status equals `COMPLETED`: if yes, proceed; if no, loop back to Wait 60 sec. Repeat until rendering completes. Note: request_id comes from the Create Video response.

3. Generate title, download video, and upload to TikTok

   Once rendering completes, the Get Url Video node fetches final video details (GET `https://queue.fal.run/google/gemini-omni-flash/requests/{{request_id}}`) and extracts `video.url`. Then the Generate title node calls OpenAI (model gpt-5) with a system prompt requiring an SEO-friendly title (≤60 chars, same language as input) and a user message containing the original prompt. Next, the Get File Video node downloads the video file from that URL. Finally, the HTTP Request node POSTs to `https://api.upload-post.com/api/upload` as multipart/form-data with: title (from Generate title output), user (replace with actual Upload-Post username), platform[] (tiktok), video (binary data, field name data). Configure Upload-Post httpHeaderAuth credentials.

   Execution prompt · Source text。Generate title node System Message field

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   You are a Video SEO expert specialized in creating engaging and optimized titles.
   
   Your task is to generate an effective title for a YouTube video based on the user's video description.
   
   GUIDELINES:
   - Maximum 60 characters to avoid truncation
   - Use relevant keywords for SEO
   - Make the title catchy and clickable
   - Avoid excessive or misleading clickbait
   - Consider the target audience of the content
   - Use numbers, questions, or power words when appropriate
   - IMPORTANT: Generate the title in the same language as the input description
   
   OUTPUT FORMAT:
   Provide only the title, without additional explanations.
   
   EXAMPLE:
   Input: "Tutorial video on how to cook perfect pasta carbonara"
   Output: "PERFECT Carbonara in 10 Minutes - Chef's Secrets"

   Execution prompt · Source text。Generate title node User Message field (Content), Role set to user

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   =Input: {{ $('Webhook').item.json.prompt }}

4. Return upload result to the caller

   After the HTTP Request (upload) node completes, the Respond to Webhook node returns the Upload-Post API response to the original webhook caller. The pipeline ends here.

# Edit Video with Gemini Omni Flash and upload to TikTok

## How It Works

1. A webhook receives a video editing request and starts the workflow.
2. The workflow submits the request to Gemini Omni Flash to edit the video and waits for the rendering process to complete.
3. It continuously checks the job status until the video has been successfully rendered.
4. Once the job is complete, the workflow retrieves the generated video URL, creates an SEO-friendly title using OpenAI, and downloads the final video.
5. Finally, the workflow uploads the processed video to Upload-Post and returns the upload response to the original caller.

## Setup Steps

- [ ] Configure the **Webhook** trigger path and ensure the incoming payload includes both the `video_url` and `prompt` fields.
- [ ] Configure your **Fal API** credentials for the HTTP Request nodes used to submit the editing job, check the rendering status, and retrieve the final video information.
- [ ] Verify that the **Post Edit Job to Gemini** node contains the correct editing prompt and the source video URL.
- [ ] Configure your **OpenAI** credentials for the **Generate Video Title** node.
- [ ] Ensure the **Download Video File** node can access the signed URL returned by the Fal API.
- [ ] Configure your **Upload-Post API** credentials in the **Upload Video to Upload-Post** node.

Create an [Upload-Post account for FREE](https://www.upload-post.com/?linkId=lp_144414&sourceId=n3witalia&tenantId=upload-post-app) and obtain your API credentials visit:

## Customization

You can easily customize this workflow by:

- Changing the polling interval in the **Wait 60 Seconds** node.
- Modifying the prompt used by the **Generate Video Title** node.
- Updating the default upload parameters (user, platforms, metadata, etc.) sent to Upload-Post.
- Replacing the final upload destination with another storage service or API if required.