merge video ffmpeg
Merge videos with FFmpeg
If you need to merge videos with FFmpeg, the common goal is to join multiple clips into one clean MP4 output. This page shows the practical FFmpeg concat workflow, the matching FFmpeg API request, and an online tool you can test in the browser.
FFmpeg CLI
How to merge videos in FFmpeg
A common FFmpeg merge workflow reads multiple inputs, concatenates their video and audio streams, then maps the merged result into a single output file.
FFmpeg merge command
Click any part of the command to see what it does.
FFmpeg merge command
ffmpeg
This runs the FFmpeg binary. Everything that follows tells FFmpeg which inputs to read, how to join them, and where to write the merged result.
API
Use the same video merge workflow through the FFmpeg API
If you need to merge clips inside your own product, app, or backend workflow, the FFmpeg API gives you a faster path than managing concat commands and media infrastructure yourself. You can send one args-based merge request and reuse the same workflow in production.
Request
curl -X POST https://ffmpeg-api.cloud/v1/jobs \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"ffmpegArgs": [
"-y",
"-i",
"{{input1}}",
"-i",
"{{input2}}",
"-filter_complex",
"[0:v][0:a][1:v][1:a]concat=n=2:v=1:a=1[v][a]",
"-map",
"[v]",
"-map",
"[a]",
"{{output}}"
],
"inputs": {
"input1": {
"type": "url",
"url": "https://example.com/input-1.mp4"
},
"input2": {
"type": "url",
"url": "https://example.com/input-2.mp4"
}
},
"outputs": {
"output": {
"fileName": "merged-output.mp4"
}
}
}'Response
{
"jobId": "job_01hxyz...",
"status": "queued",
"runtimeSeconds": 0,
"creditsCharged": 0,
"createdAt": "2026-04-14T10:30:00.000Z"
}Online tool
Try this FFmpeg API merge video tool online
Upload two or more clips, run the merge job in the browser, and inspect the matching FFmpeg API request before wiring it into your own app or backend.
Live playground
Merge videos with FFmpeg
Combine multiple source clips into one merged FFmpeg API request.
Use cases
Common ways to use FFmpeg video merging
Merging is useful when you want to stitch adjacent clips together, publish one combined asset, or simplify downstream delivery.
Join exported segments into one file
Combine chapter exports, recorded parts, or clip batches into one deliverable video without managing separate files later.
Assemble multi-step product recordings
Merge short walkthrough clips into a single onboarding, support, or demo asset for your website or product UI.
Prepare longer uploads for downstream workflows
Create one merged source video before moderation, transcription, previews, or later transforms in your backend.
FAQ
FFmpeg merge video FAQ
Common questions about merging clips with FFmpeg, concat filters, and moving the same workflow into the FFmpeg API.
Related templates
Other FFmpeg templates
Explore other FFmpeg templates for trimming, compression, resize, and more.