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ffmpeg-mcp-server

ffmpeg-mcp-server

by Ashutos1997
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TypeScript
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reformat_aspect_ratio

Change a video's aspect ratio to 9:16, 1:1, 4:5, or 16:9 using blurred borders, solid padding, or center cropping for platform-ready output.

Instructions

Change video aspect ratio to 9:16 vertical, 1:1 square, or 4:5 portrait. Adds blurred video borders, solid padding, or center crops.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "inputPath": "<inputPath>",
      "outputPath": "<outputPath>"
    },
    "name": "reformat_aspect_ratio"
  }
}

Input Schema

NameRequiredDescriptionDefault
modeNoFormat mode: 'blur_background' adds blurred video borders, 'fit_pad' adds solid color padding, and 'crop_center' zooms and crops the center. Default: 'blur_background'.blur_background
padColorNoBackground color for fit_pad mode, such as 'black', 'white', or hex '0x1e1e2e'. Default: 'black'.black
inputPathYesPath to the source video file.
blurAmountNoBlur strength (5 to 50) for blur_background mode. Default: 20.
outputPathYesDestination path for the reformatted video.
targetRatioNoTarget aspect ratio: '9:16' for vertical reels, '1:1' for square, '16:9' for horizontal, or '4:5' for portrait. Default: '9:16'.9:16
hardwareAccelerationNoUse hardware-accelerated video encoding (VideoToolbox, NVENC, QSV, etc.) when available. Default: true.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changedv0.5.1
    • addedInput schema / properties / padColor / pattern
      Added value: +"^(0x[0-9a-fA-F]{6}|#[0-9a-fA-F]{6}|[a-zA-Z]{3,20})$"
  2. Changed1 schema field changedv0.5.0
    • changedInput schema / properties / hardwareAcceleration / description
      Previous value: -"Use Apple Silicon VideoToolbox encoding when available. Default: true."New value: +"Use hardware-accelerated video encoding (VideoToolbox, NVENC, QSV, etc.) when available. Default: true."
  3. Changed7 schema fields changedv0.4.2
    • changedInput schema / properties / blurAmount / description
      Previous value: -"Blur intensity (5-50) for 'blur_background' mode. Default: 20"New value: +"Blur strength (5 to 50) for blur_background mode. Default: 20."
    • changedInput schema / properties / hardwareAcceleration / description
      Previous value: -"Whether to use Apple Silicon VideoToolbox hardware acceleration if available (default: true)"New value: +"Use Apple Silicon VideoToolbox encoding when available. Default: true."
    • changedInput schema / properties / inputPath / description
      Previous value: -"Path to the source video file"New value: +"Path to the source video file."
    • changedInput schema / properties / mode / description
      Previous value: -"Reformatting mode. 'blur_background' adds an aesthetic blurred background of the video itself. 'fit_pad' adds solid colored padding. 'crop_center' zooms and crops the center."New value: +"Format mode: 'blur_background' adds blurred video borders, 'fit_pad' adds solid color padding, and 'crop_center' zooms and crops the center. Default: 'blur_background'."
    • changedInput schema / properties / outputPath / description
      Previous value: -"Destination path for the reformatted video"New value: +"Destination path for the reformatted video."
    • changedInput schema / properties / padColor / description
      Previous value: -"Background color when using 'fit_pad' mode (e.g. 'black', 'white', or hex '0x1e1e2e')"New value: +"Background color for fit_pad mode, such as 'black', 'white', or hex '0x1e1e2e'. Default: 'black'."
    • changedInput schema / properties / targetRatio / description
      Previous value: -"Target aspect ratio. '9:16' (Reels/Shorts/TikTok), '1:1' (Square), '16:9' (Landscape), '4:5' (Portrait Feed)"New value: +"Target aspect ratio: '9:16' for vertical reels, '1:1' for square, '16:9' for horizontal, or '4:5' for portrait. Default: '9:16'."
  4. Addedv0.3.0

TDQS

B3.4/5.0
Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description carries full burden; it does disclose the three visual strategies (blurred borders, solid padding, center crop), which is the key behavioral fact. It omits audio handling, re-encode quality hit, processing cost, and how crop_center may lose content — meaningful gaps for a mutation tool.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two tightly written sentences, front-loaded with the action and followed by the visual outcomes. No filler, though the ratio enumeration is incomplete relative to the enum and slightly undersells the tool.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a 7-parameter mutation tool with no annotations and no output schema, the description covers the core visual behavior but says nothing about audio pass-through, output container/codec, or failure modes. An agent can call it, but some operational questions remain unanswered.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100% and every parameter (mode, padColor, blurAmount, targetRatio, hardwareAcceleration) is documented in the schema with defaults and ranges. The description's ratio list adds no meaning beyond the schema and even leaves out 16:9, so it earns baseline only.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description names a specific verb and resource ('Change video aspect ratio') and enumerates target ratios plus the three padding/crop styles, which distinguishes it from siblings like media_convert or create_split_screen. However, it lists only 9:16, 1:1 and 4:5 while the schema also accepts 16:9, so the stated scope is incomplete.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Usage is implied by the outcome ('change aspect ratio'), but there is no explicit guidance on when to pick this over media_convert, create_split_screen, or crop-related siblings. No prerequisites, no when-not-to-use conditions.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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