The video frame interpolation operator is used to increase the frame rate of input videos by generating intermediate frames to enhance playback smoothness, and outputs a new high-frame-rate video file. You can specify the target frame rate as needed, select the interpolation mode, and decide whether to retain the original audio stream. This operator is suitable for scenarios that require improved motion smoothness, exporting higher frame rate versions, or standardizing video output specifications.

operator_id：las_video_interpolation

Limitations #

• target_fps must be greater than 0 and cannot be lower than the source video frame rate.

Core capabilities #

• Supports three interpolation modes: ultra-fast, fast, and medium, balancing speed and quality. Flexible settings allow low-frame-rate videos to be increased to the specified target frame rate.
• Automatically retains the original audio stream, eliminating the need for additional audio-video merging operations.
• Supports output to TOS, with results automatically uploaded.

Supported regions #

• Beijing: cn-beijing

Operator performance #

• Total processing time depends on video duration, processing mode, and network environment.
• The operator relies on CUDA GPU and video frame interpolation models. Higher resolution, higher target frame rate, and longer videos result in increased overall processing time.
• It is recommended to access TOS sources and write TOS results within the Volcano Engine intranet environment for more stable network performance.

Input requirements #

Output requirements #

• Billing standards

  Sub-items	Billing standard description
  Billing item	Billing is calculated based on the duration of the output video. When billing, the duration is adjusted using a frame rate coefficient according to the output video frame rate.
  Billing type	Pay-as-you-go, unit: CNY/minute, billed hourly based on actual usage.
  Unit price	The unit price depends on the selected video frame interpolation mode and is tiered according to the output video resolution range.

• Billing details
  Billing formula: Total cost = Unit price * Billable usage = Unit price * (Video duration * frame rate coefficient)

  Sub-scenarios	Output video resolution tier range	Unit price	Frame rate coefficient
  Mode: ultra-fast/fast	Output video resolution ≤ 720p	0.5 CNY/minute	Different video frame rates correspond to different frame rate coefficients: Actual frame rate ≤ 30 fps: coefficient is "1" 30 fps < Actual frame rate ≤ 60 fps: coefficient is "2" 60 fps < Actual frame rate ≤ 90 fps: coefficient is "3" 90 fps < Actual frame rate: coefficient is "Frame rate/30", rounded up
  	720p < Output video resolution ≤ 1080p	1.5 CNY/minute
  	1080p < Output video resolution ≤ 1440p	2 CNY/minute
  	1440p < Output video resolution	5 CNY/minute
  Mode: medium	Output video resolution ≤ 720p	2 CNY/minute	Different video frame rates correspond to different frame rate coefficients: Actual frame rate ≤ 30 fps: coefficient is "1" 30 fps < Actual frame rate ≤ 60 fps: coefficient is "2" 60 fps < Actual frame rate ≤ 90 fps: coefficient is "3" 90 fps < Actual frame rate: coefficient is "Frame rate/30", rounded up
  	720p < Output video resolution ≤ 1080p	4 CNY/minute
  	1080p < Output video resolution ≤ 1440p	7 CNY/minute
  	1440p < Output video resolution	12 CNY/minute

• Billing example: When using the medium mode for video frame interpolation, with the actual output video resolution at 720p, a video duration of 5 minutes, and a frame rate of 120 fps:

  • The frame rate coefficient is: 120/30 = 4.
  • Cost = Unit price * (Video duration * coefficient) = 2 CNY/minute * (5 minutes * 4) = 40 CNY

Interface description #

Invoke the video frame interpolation operator to submit asynchronous tasks to increase the frame rate of input videos and upload the results.

Submit (submit task) #

You can call the Submit interface to submit asynchronous tasks.

Request parameters #

Response parameters #

Request example #

# Please set OUTPUT_TOS_PATH to a tos path that is writable by this account
export OUTPUT_TOS_PATH="tos://path/to/interpolation_results"

curl --location "https://operator.las.ap-southeast-1.volces.com/api/v1/submit" --header "Content-Type: application/json" --header "Authorization: Bearer $$LAS_API_KEY" --data '{
    "operator_id": "las_video_interpolation",
    "operator_version": "v1",
    "data": {
        "video_url": "https://${LAS_TOS_BUCKET}.${TOS_ENDPOINT}/operator_cards_serving/public/${LAS_ENVIRONMENT}/las_video_interpolation/v1/sample_input.mp4",
        "output_tos_path": "$$OUTPUT_TOS_PATH",
        "target_fps": 60.0,
        "mode": "fast"
    }
}'

Response example #

{
  "metadata": {
    "task_id": "task-20260413190000-abc123",
    "task_status": "PENDING",
    "business_code": "0",
    "error_msg": ""
  }
}

Error code #

Poll (query task) #

You can call the Poll API to query the execution status and result of the video frame interpolation task. When metadata.task_status is COMPLETED, you can obtain the output video URL from the data field in the response.

Request parameters #

Response parameters #

Request example #

curl --location "https://operator.las.ap-southeast-1.volces.com/api/v1/poll" --header "Content-Type: application/json" --header "Authorization: Bearer $$LAS_API_KEY" --data '{
    "operator_id": "las_video_interpolation",
    "operator_version": "v1",
    "task_id": "task-20260413190000-abc123"
}'

Response example #

{
    "metadata": {
        "task_id": "task-20260413190000-abc123",
        "task_status": "COMPLETED",
        "submit_time": "2026-07-21T16:04:06+08:00",
        "end_time": "2026-07-21T16:04:06+08:00",
        "business_code": "0",
        "error_msg": ""
    },
    "data": {
        "output_video_tos_url": "tos://path/to/interpolation_results/sample_output_60fps.mp4",
        "output_video_url": "https://path/to/interpolation_results/sample_output_60fps.mp4"
    }
}

Error code #