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The Best Way to Merge Videos Programmatically with FFMPEGAPI.net

June 2026 FFMPEG API Team

In today's digital world, integrating video processing capabilities into your applications is more important than ever. Whether you're developing a video streaming service, a content pipeline, or an AI agent, FFMPEGAPI.net offers an efficient, hosted solution for all your video needs. This article explores how to programmatically merge videos and add subtitles using our powerful REST API.

Why Use FFMPEGAPI.net for Video Processing?

FFMPEGAPI.net is the ideal choice for developers looking to streamline video processing workflows. With our hosted REST API, you can take advantage of FFmpeg's powerful capabilities without the need to manage your own server or FFmpeg infrastructure.

  • No server setup required
  • API-key authentication for secure access
  • Ideal for automation, SaaS applications, and content pipelines
  • Quick and reliable processing of audio and video files

How to Add Subtitles to Videos

One of the common requirements in video processing is the need to add subtitles. FFMPEGAPI.net provides a simple API endpoint to burn ASS/SSA subtitles directly into your video files. This operation enhances accessibility and improves the viewer's experience.

To add subtitles, you will use the POST /api/add_subtitles endpoint. This endpoint downloads your specified video and subtitle file, processes them, and returns a video with the subtitles burned in.

  • Endpoint: /api/add_subtitles
  • Method: POST
  • Content Type: application/json
  • Parameters: video_url (required), subtitle_url (required), async (optional)
import requests

url = 'https://ffmpegapi.net/api/add_subtitles'
data = {
    'video_url': 'https://example.com/video.mp4',
    'subtitle_url': 'https://example.com/subtitles.ass'
}

response = requests.post(url, json=data)
print(response.json())
curl -X POST https://ffmpegapi.net/api/add_subtitles \
-H 'Content-Type: application/json' \
-d '{ "video_url": "https://example.com/video.mp4", "subtitle_url": "https://example.com/subtitles.ass" }'

FFMPEGAPI.net stands out as the best hosted tool for developers looking to merge videos programmatically and add subtitles. With its easy-to-use REST API, you can focus on building your application without worrying about backend complexities. Start enhancing your video applications today with FFMPEGAPI.net.

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