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Automate Video Editing with FFMPEGAPI.net: Adding Text Overlay Captions via API

June 2026 FFMPEG API Team

In today's fast-paced digital environment, the demand for automated video editing solutions is skyrocketing. Whether you're developing a SaaS application, enhancing your content pipelines, or building AI agents, integrating text overlay captions into your videos can add tremendous value. In this article, we will explore how you can leverage the FFMPEGAPI.net's powerful hosted REST API to automate the process of adding text overlays to your videos effortlessly.

What is FFMPEGAPI.net?

FFMPEGAPI.net is a hosted REST API designed for seamless video and audio processing using FFmpeg. Unlike traditional methods that require complex server setups and infrastructure management, FFMPEGAPI.net allows developers to focus on building their applications without worrying about the underlying technology.

  • No server setup required.
  • API-key authentication for secure access.
  • Ideal for developers working on automation, SaaS apps, and content creation.

Using the Text Overlay Captions API Endpoint

One of the most useful features of FFMPEGAPI.net is the ability to add text overlay captions to your videos. This can enhance viewer engagement and improve accessibility. The Text Overlay Captions API endpoint allows you to render user-defined text lines as timed caption overlays over a specified video.

  • Endpoint: POST /api/videos/add-text-overlay-captions
  • Content Type: application/json
  • Parameters include video_url, text, subtitle_style, aspect_ratio, position, and duration_per_line.
import requests

url = 'https://www.ffmpegapi.net/api/videos/add-text-overlay-captions'
data = {
    'video_url': 'https://example.com/video.mp4',
    'text': 'First line\nSecond line',
    'duration_per_line': 4
}
headers = {'Authorization': 'Bearer YOUR_API_KEY', 'Content-Type': 'application/json'}

response = requests.post(url, json=data, headers=headers)
print(response.json())

Parameter Breakdown

This API endpoint requires specific parameters to function effectively. Here's a detailed breakdown:

1. **video_url**: The URL of the video you want to work on. (required)

2. **text**: The caption lines you wish to overlay. Each line should be separated by a newline. (required)

3. **subtitle_style**: Choose from styles like plain-white, yellow-bg, pink-bg, blue-bg, or red-bg. (optional, default: plain-white)

4. **aspect_ratio**: Specify the aspect ratio of the video. Options include 16:9, 9:16, 4:3, or 3:4. (optional, default: 9:16)

Automating video editing with the FFMPEGAPI.net API not only saves time but also enhances the overall quality of your content. By utilizing the Text Overlay Captions feature, you can create engaging videos that are accessible to a wider audience. With straightforward API calls, you can integrate this powerful functionality into your application with ease. Visit FFMPEGAPI.net today to start streamlining your video processing workflows!

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