Merge Videos via API

Merge multiple video clips into a single file. Supports concatenation of same-format files with stream copy or cross-format merging with re-encoding.

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Loading FFmpeg engine... (~31 MB)

Use the API

curl -X POST https://renderio.dev/v1/commands \
  -H "X-API-KEY: ffsk_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
  "ffmpeg_command": "-i {in_video} -i {in_video} -filter_complex concat=n=2:v=1:a=1 {out_video}",
  "input_files": {
    "in_video": "https://example.com/input.mp4"
  },
  "output_files": {
    "out_video": "output.mp4"
  }
}'

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Common Variations

Concat with filter (different formats)

-i input1.mp4 -i input2.mp4 -filter_complex "[0:v][0:a][1:v][1:a]concat=n=2:v=1:a=1" output.mp4

Concat 3 videos

-i input1.mp4 -i input2.mp4 -i input3.mp4 -filter_complex "[0:v][0:a][1:v][1:a][2:v][2:a]concat=n=3:v=1:a=1" output.mp4

With crossfade transition

-i input1.mp4 -i input2.mp4 -filter_complex "xfade=transition=fade:duration=1:offset=4,format=yuv420p" output.mp4

Related Operations

Trim Video via API | RenderIO Split Video via API | RenderIO Overlay Video via API | RenderIO Fade Video via API | RenderIO

Need to process at scale?

Automate this with the RenderIO FFmpeg API. Process thousands of files programmatically or through no-code video automation.

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