Convert AVI to MP4 via API

AVI is a legacy format that lacks modern streaming support. Convert to MP4 with H.264 encoding for smaller file sizes, web playback, and universal compatibility.

Try it in your browser

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} -c:v libx264 -crf 23 -c:a aac -movflags +faststart {out_video}",
  "input_files": {
    "in_video": "https://example.com/input.avi"
  },
  "output_files": {
    "out_video": "output.mp4"
  }
}'

Need an API key? Get your free API key to start processing files programmatically.

Common Variations

Fast encode with lower quality

-i input.avi -c:v libx264 -preset ultrafast -crf 28 -c:a aac output.mp4

Preserve original quality

-i input.avi -c:v libx264 -crf 18 -preset slow -c:a aac -b:a 192k output.mp4

1080p cap with scaling

-i input.avi -vf "scale=1920:-2:flags=lanczos" -c:v libx264 -crf 23 -c:a aac output.mp4

Related Operations

Convert MP4 to AVI via API | RenderIO Convert MKV to MP4 via API | RenderIO Convert MOV to MP4 via API | RenderIO Compress 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.

Get your API key