tencent cloud


Last updated: 2022-03-24 16:00:57


    Video upload from client refers to uploading local videos to the VOD platform by an end user of application. This document describes how to upload videos using a client.


    1. Activate the service

    Activate VOD.

    2. Get TencentCloud API key

    Get the security credentials (i.e., SecretId and SecretKey) required to call the server API in the following steps:

    1. Log in to the console and select Products > Cloud Access Management > API Key Management to enter the "API Key Management" page.
    2. Get the TencentCloud API key. If you have not created a key, click Create Key to create a pair of SecretId and SecretKey.


    1. Apply for upload signature

    The client needs to apply to the signature distribution server of the application for an upload signature. For detailed directions, please see Signature for Upload from Client. Below are samples of generating signatures in different programming languages:


    • Upload from client is to directly upload video files from a client to the VOD platform, without the need to relay files through the application server. Therefore, VOD has to authenticate the client that initiates the request.
    • The application shall not disclose SecretKey, which has ultimate permissions, to the client in order to avoid serious security breaches. Therefore, before initiating a request, the client needs to apply for an upload signature.

    2. Use the SDK to upload video

    VOD provides SDKs for multiple platforms to help upload videos from client with ease. For more information, please see:

    Advanced features

    • Specify a task flow during upload
      If you want to automatically initiate a video processing task flow such as transcoding and screencapturing upon video upload completion, you can set the procedure parameter when generating the upload signature, and the parameter value should the name of the desired task flow template. VOD supports creating task flow templates and naming them. When initiating a task flow, you can use the task flow template name to indicate the desired task.
    • Specify a storage region during upload
      The storage region provided by VOD is "Singapore" by default. If you want to store files in another region, you need to activate it in the console. For more information, please see Upload Storage Settings. After the settings are made, the storage region can be specified by the storageRegion parameter when the upload signature is generated, and the parameter value should be a region abbreviation.
    • Upload a video with cover
      VOD allows you to upload a video with its cover by entering the path to the cover in the upload SDK API. For more information, please see:
    • One-time signature
      During video upload, the signature distributed by the application backend can be used multiple times within its validity period. If the application has high requirements for video upload security, you can use the one-time signature feature.
      How to use one-time signature: you just need to set oneTimeValid to 1 when the application backend distributes the signature. For more information, please see Signature for Upload from Client.

      The one-time signature can be used only once. Though this approach is more secure, the application has to perform extra processing. For example, when upload fails, you cannot simply use the SDK to upload the video again; instead, you need to apply for a new upload signature.

    • Resumable upload
      During the video upload process, when the upload is terminated unexpectedly, you can upload the file again from where it left off.

      The effective time for resumption is 1 day, i.e., if the upload of a video is interrupted and then resumed within 1 day, it can be directly resumed; otherwise, the full video will be uploaded again by default.

      You can enable the resumable upload feature for the application as shown below:
    • Pause/resume/cancel upload
      During video upload, the VOD SDK allows you to pause, resume, or cancel upload. For more information, please see:


    • How do I enable automatic transcoding after video upload is completed?
      You can use the procedure parameter in the signature for upload from client to specify the video processing method after video upload is completed. For more information, please see Specifying a Task Flow During Upload.
    • How does the application backend identify which client uploaded the video when it receives the video upload completion notification?
      You can add the sourceContext parameter to the signature for upload from client to carry the user identity information. The video upload completion notification will pass this parameter to the application backend. For more information, please see Event Notification.

    3. Event notification

    After a video upload is completed, VOD will initiate an event notification - video upload completion to the application backend, through which the application backend can become aware of the video upload event. To receive event notifications, you need to go to Console - Callbacks to enable event notification. Event notification - video upload completion mainly contains the following information:

    • FileId and URL of the uploaded video.
    • VOD supports specifying passthrough fields during video upload, which will be sent to the application backend upon event completion. The following fields are in the event notification:
      • SourceType: this field is always ServerUpload, indicating that the upload originates from a server.
      • SourceContext: this is a custom passthrough field specified by the application backend during signature distribution, which corresponds to the sourceContext parameter in the signature.
    • VOD supports automatic video processing upon video upload completion. If a video processing task flow is specified during upload, the task ID will also be included in the event notification content, i.e., the data.procedureTaskId field.

    For more information, please see:

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