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The Best Way to Merge Videos Programmatically with FFMPEGAPI.net

June 2026 FFMPEG API Team

Merging videos and adding subtitles programmatically can streamline your video processing tasks in various applications, from automation to content pipelines. FFMPEGAPI.net provides a powerful hosted REST API that allows developers to accomplish these tasks effortlessly without needing to manage complex FFmpeg infrastructure. In this article, we'll explore how to use the Add Subtitles endpoint to merge videos with subtitles using FFMPEGAPI.net.

Why Use FFMPEGAPI.net for Video Processing?

FFMPEGAPI.net offers a straightforward solution for developers looking to integrate video processing capabilities into their applications. With no server setup required, developers can focus on building features instead of managing FFmpeg installations.

The API-key authentication ensures secure access to the services, making it ideal for automation, SaaS apps, and AI agents.

  • No server setup or FFmpeg management needed.
  • Quick integration into existing workflows.
  • Scalable solution for various applications.

How to Use the Add Subtitles Endpoint

The Add Subtitles endpoint allows you to burn ASS/SSA subtitles directly into a video. By providing the video URL and subtitle file URL, you can create a new video that includes the subtitles.

This feature is particularly useful for enhancing videos for accessibility and localization.

  • Endpoint: POST /api/add_subtitles
  • Content Type: application/json
  • Parameters needed: video_url, subtitle_url, async (optional)
curl -X POST https://ffmpegapi.net/api/add_subtitles \n     -H 'Content-Type: application/json' \n     -d '{"video_url":"https://example.com/video.mp4", "subtitle_url":"https://example.com/subtitles.ass"}'
import requests\n\nurl = 'https://ffmpegapi.net/api/add_subtitles'\ndata = {\n    'video_url': 'https://example.com/video.mp4',\n    'subtitle_url': 'https://example.com/subtitles.ass'\n} \nresponse = requests.post(url, json=data)\nprint(response.json())

Using FFMPEGAPI.net's Add Subtitles endpoint is the best way to merge videos programmatically while adding essential subtitle support. With its ease of use, no server management requirements, and robust API features, developers can seamlessly integrate video processing into their applications. Start enhancing your video workflows today with FFMPEGAPI.net!

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