Composer Reference Guide R2-2026-2.6.9642.28010

Capabilities

GET /runtime/capabilities

Returns static hardware and software capabilities of this runtime instance. Responds immediately (read-only, no lifecycle action). The response is useful for capacity planning, feature-gate checks, and diagnostic tooling.

Parameters: None

Response: 200 OK — JSON object:

{
  "runtime": {
    "binaryPath": "C:\\Program Files\\Vindral Composer Runtime\\VindralComposerRuntime.exe",
    "version": "2.6.9606.36410"
  },
  "cuda": {
    "driverVersion": "12.40",
    "deviceCount": 1,
    "activeDeviceId": 0,
    "devices": [
      {
        "index": 0,
        "name": "NVIDIA GeForce RTX 4090",
        "computeCapability": "8.9",
        "totalMemoryMb": 24564,
        "multiProcessorCount": 128,
        "clockRateMhz": 2520,
        "memoryClockRateMhz": 10501,
        "computeMode": "Default",
        "tccDriver": false,
        "eccEnabled": false,
        "pciBusId": 1,
        "pciDeviceId": 0
      }
    ]
  },
  "nvenc": {
    "available": true,
    "supportedCodecs": ["H264", "HEVC", "AV1"],
    "maxConcurrentSessions": "8"
  },
  "nvdec": {
    "codecs": [
      {
        "codec": "H264",
        "bitDepth": 8,
        "supported": true,
        "numDecoders": 2,
        "maxWidth": 4096,
        "maxHeight": 4096,
        "minWidth": 48,
        "minHeight": 48
      },
      {
        "codec": "H264",
        "bitDepth": 10,
        "supported": true,
        "numDecoders": 2,
        "maxWidth": 4096,
        "maxHeight": 4096,
        "minWidth": 48,
        "minHeight": 48
      }
    ]
  },
  "ndi": {
    "runtimePresent": true
  },
  "decklink": {
    "devices": ["DeckLink Mini Recorder 4K"],
    "channels": [
      { "index": 0, "name": "DeckLink Mini Recorder 4K (1)" }
    ]
  },
  "fonts": {
    "count": 245,
    "families": ["Arial", "Calibri", "..."]
  },
  "storage": {
    "drives": [
      {
        "name": "C:\\",
        "totalSizeMb": 953869,
        "availableFreeMb": 512345,
        "format": "NTFS",
        "type": "Fixed"
      }
    ]
  },
  "ffmpeg": {
    "version": "6.1.1-realsprint",
    "path": "C:\\ffmpeg6p2\\bin\\"
  },
  "timestamp": "2026-04-20T12:00:00.0000000Z"
}

Response fields:

runtime object

Field Type Description
binaryPath string Full path to the VindralComposerRuntime executable
version string Assembly version of the runtime binary

cuda object

Field Type Description
driverVersion string NVIDIA CUDA driver version
deviceCount int Number of CUDA-capable devices
activeDeviceId int Device index selected by Composer for rendering
devices array Per-device details (see below)

Each device:

Field Type Description
index int Device index
name string GPU product name
computeCapability string CUDA compute capability (e.g. "8.9")
totalMemoryMb long Total GPU memory in MB
multiProcessorCount int Number of streaming multiprocessors
clockRateMhz int Core clock rate in MHz
memoryClockRateMhz int Memory clock rate in MHz
computeMode string CUDA compute mode (Default, ExclusiveThread, Prohibited, ExclusiveProcess)
tccDriver bool Whether TCC (Tesla Compute Cluster) driver mode is active
eccEnabled bool Whether ECC memory is enabled
pciBusId int PCI bus ID
pciDeviceId int PCI device ID

nvenc object

Field Type Description
available bool Whether NVENC hardware encoding is available
supportedCodecs string[] Codecs the GPU can encode (H264, HEVC, AV1)
maxConcurrentSessions string Max concurrent encode sessions ("8" for GeForce/consumer, "unlimited" for professional/datacenter)

nvdec object

codecs array — each entry:

Field Type Description
codec string Codec name (H264, HEVC, VP9, AV1)
bitDepth int Bit depth (8 or 10)
supported bool Whether this codec/depth combo is supported
numDecoders int Number of NVDEC engines on the GPU
maxWidth uint Maximum decode width in pixels
maxHeight uint Maximum decode height in pixels
minWidth int Minimum decode width in pixels
minHeight int Minimum decode height in pixels

ndi object

Field Type Description
runtimePresent bool Whether the NDI runtime library is installed and initialized
Field Type Description
devices string[] Distinct DeckLink device names
channels array Per-channel details with index and name

fonts object

Field Type Description
count int Total number of installed font families
families string[] Sorted list of font family names

storage object

drives array — each entry:

Field Type Description
name string Drive root path (e.g. "C:\")
totalSizeMb long Total drive size in MB
availableFreeMb long Available free space in MB
format string File system format (NTFS, ext4, etc.)
type string Drive type (Fixed, Removable, Network, etc.)

ffmpeg object

Field Type Description
version string FFmpeg version string as reported by av_version_info()
path string Path to the FFmpeg binaries in use