Constraints

Before using VOD, you need to know the following constraints.

Resource Limits

VOD has limits on resources such as domain names and watermarks.

**Table 1** Resource limits
Item	Description	Limit
Region	The service is available for new users only in the CN North-Beijing4 region.	-
Domain name	Maximum number of self-owned domain names that you can add on the VOD console. The domain name to be added must meet the following requirements: The domain name has been licensed by the Ministry of Industry and Information Technology (MIIT) and the Internet Content Provider (ICP) license is still valid. NOTE: The system automatically checks all domain names under your name and deletes domain names that have been idle for a long time. For details, see Configuring Domain Names.	5
Pull from URLs	Maximum number of media files that can be pulled at a time	Console: 100 API: 16
URL pull rate	Rate at which one user pulls and uploads source media files offline to VOD from the URLs of the source media files in a day. If there are a large number of media files, you are advised to migrate the media files to OBS buckets and then host them to VOD.	5–10 TB
Watermarking	Maximum number of watermarks that can be added to a video file at a time	2
Categorization	Maximum number of subcategories can be added to each category	128
Labeling	Maximum number of labels that you can add to a media file	16
Referer validation	Maximum number of domain names that can be added to a referer blacklist or whitelist	100
Media pre-loading	Maximum number of times that one subscriber can pre-load media files in a day	1,000

API Limits

The VOD service sets a limit on the number of API calls to prevent service interruption caused by repeated API calls in a short period of time.

**Table 2** API rate limiting
Category	API	API Calls for a Single Tenant Per Minute	API Calls for All Tenants Per Minute
Media upload	Uploading media files to VOD Obtaining upload authorization Confirming media upload Authorizing access to OBS Replicating media files in OBS to VOD Replicating media files from OBS to VOD Verifying the upload	1,500	12,000
Media upload	Pulling media files from URLs	100	1,000
Media management	Deleting media files Publishing media files Canceling media publish Modifying file attributes	100	1,000
Media management	Querying file information Querying file details Querying media files	1,500	12,000
OBS hosting	Querying hosting tasks Querying details about a hosting task Querying details about hosted media files	1,500	12,000
Media pre-loading	Pre-loading a media file	10	250
Media pre-loading	Querying pre-loading results	100	1,000
Media processing	Processing a video file Updating a video file Extracting audio Setting a thumbnail	100	1,000
Media category	Creating a media category Modifying a media category Deleting a media category Querying media categories	100	1,000
Key query	Key query	1,500	12,000
Statistical analysis	Querying CDN statistics Querying origin server statistics Querying the most requested content Querying playback logs of a domain name	100	1,000
Transcoding template group management	Creating a custom transcoding template group Querying transcoding template groups Modifying a custom transcoding template group Deleting a custom transcoding template group	1,500	12,000
Watermark template management	Creating a watermark template Querying a watermark template Modifying a watermark template Deleting a watermark template Confirming watermark image upload	1,500	12,000
Subtitle management	Managing subtitles	100	1000
Transcoding template management	Creating a custom transcoding template Querying transcoding templates Updating a transcoding template Deleting a custom template	1,500	12,000
Transcoding template set management	Creating a transcoding template group set Modifying a transcoding template group set Querying custom template group sets Deleting a transcoding template group set	1,500	12,000