Kling video and image API

{
  "error": {
    "message": "request body does not match the JSON contract: json: unknown field \"size\"",
    "type": "invalid_request_error"
  }
}

{ "url": "https://cdn.example.com/file.png" }

{ "file_id": "your-file-id" }

{
  "model": "kling-v3-omni",
  "prompt": "<<<element_1>>> and <<<element_2>>> rotate slowly on a clean studio table",
  "duration": 5,
  "resolution": "1080p",
  "audio": false,
  "images": [
    { "url": "https://cdn.example.com/first.png", "usage": "first_frame" },
    { "file_id": "last-frame-file-id", "usage": "last_frame" },
    { "url": "https://cdn.example.com/reference-a.png", "usage": "reference" },
    { "file_id": "reference-b-file-id", "usage": "reference" }
  ],
  "videos": [
    {
      "url": "https://cdn.example.com/character-motion.mp4",
      "reference_type": "feature",
      "keep_original_sound": false
    }
  ],
  "subjects": [
    { "id": "subject-92951593344", "name": "cat" },
    { "id": "subject-92951593345", "name": "dog" }
  ]
}

{
  "model": "kling-v3-omni",
  "prompt": "A short product story in two shots",
  "duration": 5,
  "shots": {
    "mode": "customize",
    "segments": [
      { "index": 1, "prompt": "The box opens", "duration": 2 },
      { "index": 2, "prompt": "The product is revealed", "duration": 3 }
    ]
  }
}

{
  "model": "kling-v3-motion-control",
  "prompt": "Follow the dancer's movement",
  "resolution": "1080p",
  "images": [{ "file_id": "person-image-file-id" }],
  "videos": [{ "url": "https://cdn.example.com/dance.mp4", "keep_original_sound": true }],
  "extra": { "character_orientation": "video" }
}

curl https://api.essevin.com/v1/kling/faces \
  -H "Authorization: Bearer sk-your-key" \
  -H "Content-Type: application/json" \
  -d '{"videos":[{"file_id":"source-video-file-id"}]}'

{
  "model": "kling-lip-sync",
  "extra": {
    "session_id": "face-session-id",
    "face_choose": [
      { "face_id": "face-1", "sound_file": "https://cdn.example.com/voice.mp3" }
    ]
  }
}

  -H "Authorization: Bearer sk-your-key" \
  -H "Content-Type: application/json" \
  -d '{"model":"kling-v3","prompt":"A red ball rolls across a white table","duration":5,"resolution":"720p"}'

  -H "Authorization: Bearer sk-your-key"

# A field outside the table
request body does not match the JSON contract: json: unknown field "<field>"

# Both prompt and images are empty
prompt and input images cannot both be empty

# An images[] item with neither or both of url / file_id
images[<index>] must provide exactly one of url or file_id

# url that is not a public absolute http(s) address
images[<index>].url must be a publicly accessible absolute http(s) URL

# usage on an images[] item
images[<index>].usage is not part of the image generation API; remove this field

# Images sent to kling-image-v2-1
model "kling-image-v2-1" is a text-to-image model and does not accept input images

# kling-image-v2-1-i2i without exactly 1 image
model "kling-image-v2-1-i2i" requires exactly 1 input image

# kling-image-v2-1-multi-ref without 2–4 images
model "kling-image-v2-1-multi-ref" requires 2 to 4 input images

# Expansion without exactly 1 image
image expansion requires exactly 1 input image

# Expansion extra with a key other than the four ratios
extra.<key> is not a verified parameter of the image expansion API

# Expansion ratio that is not a number from 0 to 2
extra.<key> must be a number between 0 and 2

# All four ratios are 0
the four expansion ratios cannot all be 0

# Expanded area over 3x the original
expanded area cannot exceed 3x the original image

# extra on a non-expansion model
model "<model ID>" does not accept unverified extra parameters

# A quality tier the model does not offer
model "<model ID>" does not support quality tier "<value>"

# n outside 1–9
n must be between 1 and 9, got <value>

# More reference images than the model allows
model "<model ID>" accepts at most <max> input images, got <count>

{
  "model": "kling-image-v3",
  "prompt": "A ceramic teapot on a sunlit table",
  "quality": "1k",
  "n": 1
}

{
  "model": "kling-image-expand",
  "images": [
    {
      "url": "https://example.com/input.png"
    }
  ],
  "extra": {
    "left_expansion_ratio": 0.5,
    "right_expansion_ratio": 0.5,
    "up_expansion_ratio": 0,
    "down_expansion_ratio": 0
  }
}

{
  "id": "ktEXAMPLE",
  "object": "image.generation.task",
  "status": "queued",
  "model": "kling-image-v3",
  "requested_images": 1
}

{
  "id": "ktEXAMPLE",
  "status": "completed",
  "outputs": [
    "https://api.essevin.com/example-signed-image.png"
  ]
}

{
  "id": "ktEXAMPLE",
  "status": "failed",
  "error": {
    "code": "timeout",
    "message": "task did not reach a billable terminal state within 2 hours; polling stopped"
  }
}

# No prompt and no media at all (except lip sync)
prompt and input media cannot both be empty

# Negative duration
duration cannot be negative

# duration sent to a model whose length comes from the input (motion control, avatar, lip sync)
duration of model <model ID> is determined by the input media; do not pass duration

# duration outside the model range
model <model ID> supports <min> to <max> seconds, got <value>

# kling-o1 without reference inputs and a duration other than 5 or 10
Kling O1 without reference media only supports duration 5 or 10 seconds

# kling-v2-6 with a duration other than 5 or 10
model kling-v2-6 only supports a duration of 5 or 10 seconds, got <value>

# aspect_ratio other than 16:9 / 9:16 / 1:1
aspect_ratio="<value>" is invalid; allowed values: 16:9 / 9:16 / 1:1

# Non-empty voice_ids (the message starts with this)
voice_ids is not available yet

# An extra key this model does not accept
extra.<key> is not in the verified parameter contract of model <model ID>

# Shot, subject, voice or original-sound parameters inside extra (use the structured fields)
extra.<key> cannot be passed through; use the structured shots parameter
extra.element_list cannot be passed through; use the structured subjects parameter
extra.voice_list is reserved; use voice_ids instead (voice selection is not available yet)
extra.keep_original_sound cannot be passed through; use videos[].keep_original_sound

# Media item with neither or both of url / file_id; url that is not a public absolute http(s) address
<images>[<index>] must provide exactly one of url or file_id
<images>[<index>].url must be a publicly accessible absolute http(s) URL

# Invalid usage / reference_type value
images[<index>].usage="<value>" is invalid; allowed values: first_frame / last_frame / reference
videos[<index>].reference_type="<value>" is invalid; allowed values: feature / base

# Ordinary generation missing usage / reference_type, or more than 1 video
images[<index>].usage is required for standard Kling video requests
videos[0].reference_type is required for standard Kling video requests; allowed values: feature / base
standard Kling video requests accept at most 1 videos input

# First- and last-frame rules
at most 1 first-frame image is allowed
at most 1 last-frame image is allowed
a last frame requires a first frame with usage=first_frame
Kling 2.1 first/last-frame generation only supports 1080p
a last frame is not supported with more than 2 reference images (got <count>)

# Reference video type not supported by the model, or base mixed with images / subjects
model <model ID> has no confirmed feature reference-video capability or price tier
model <model ID> has no confirmed base video-edit price tier
base video edit cannot be combined with images or subjects; only a single video to edit is accepted

# Reference image counts
with a reference video, reference images + subjects cannot exceed 4, got <total> (<images> images + <subjects> subjects)
without a reference video, reference images + subjects cannot exceed 7, got <total> (<images> images + <subjects> subjects)
model <model ID> supports at most <max> reference images, got <count>
model <model ID> does not support reference-based generation

# Subjects
subjects[<index>].id is required (Kling fixed subjects must carry an Id)
model <model ID> does not support subjects (fixed subjects)
model <model ID> requires at least 1 image with usage=reference when subjects are used
prompt references "<<<element_N>>>" but no subjects were provided
prompt references "<<<element_N>>>" but subjects only has <count> items
subjects[<index>] is not referenced in prompt as <<<element_<N>>>>

# Shots
model <model ID> does not support shots (multi-shot storyboard)
shots.mode="<value>" is invalid; allowed values: intelligence / customize
shots.mode=customize requires segments
shots.mode=intelligence does not accept segments; shots are generated by the model
at most 6 shot segments are allowed, got <count>
shots.segments[<index>].index must be numbered consecutively from 1, got <value>
shots.segments[<index>].prompt cannot be empty
shots.segments[<index>].prompt exceeds 512 characters
shots.segments[<index>].duration must be at least 1 seconds
sum of shot durations (<sum> s) must equal the total duration (<total> s)

# Motion control
motion control requires exactly 1 motion video and 1 character image
motion control images[<index>] does not accept usage; the character image role is fixed by the scene
motion control videos[<index>] does not accept reference_type; the motion video role is fixed by the scene
extra.character_orientation must be image or video

# Avatar
Kling avatar requires at least 1 character image
model <model ID> supports at most 5 character images, got <count>
Kling avatar does not accept videos input
Kling avatar requires exactly one of extra.sound_file or extra.audio_id
extra.sound_file must be a non-empty string
extra.audio_id must be a non-empty string
extra.sound_file must be a publicly accessible http(s) audio URL

# Lip sync
Kling lip-sync does not accept images; use extra.session_id and extra.face_choose
Kling lip-sync requires a non-empty extra.session_id
Kling lip-sync requires an extra.face_choose array with exactly 1 item
extra.face_choose[0].<key> is not part of the lip-sync contract
extra.face_choose[0].face_id must be a non-empty string or a non-negative integer
extra.face_choose[0].sound_file must be a non-empty string
extra.face_choose[0].sound_file must be a publicly accessible http(s) audio URL

# No price tier for the resolution / audio / reference-video combination
model "<model ID>" does not support billing bucket "<tier>" for this request

{
  "id": "ktEXAMPLE",
  "object": "video.generation.task",
  "model": "kling-v3",
  "status": "failed",
  "created": 1790000000,
  "error": {
    "code": "timeout",
    "message": "task did not reach a billable terminal state within 2 hours; polling stopped"
  }
}