Constraints

Before using Live, understand the following constraints.

Resource Constraints

Table 1 describes the constraints.

**Table 1** Usage restrictions
Item	Description
Region	Currently, Live is available only in AP-Bangkok, AP-Singapore, and CN North-Beijing4.
Domain name	By default, you can add a maximum of 64 domain names to each account. If you want to livestream an event in the Chinese mainland or globally, ensure that the domain name to be added has been licensed by the Ministry of Industry and Information Technology (MIIT) and the ICP license is valid.
Concurrent live stream	There is no limit on the number of concurrent live streams. However, if you will have a large number of concurrent live streams, you are advised to submit a service ticket.
Stream pushing	There is no limit on the bitrate. Common resolutions and bitrates are supported. To ensure smooth streaming, it is recommended that the bitrate be no greater than 4 Mbit/s.
Playback	You can play a live stream only after ingest and streaming domain names have been associated and the values of AppName and StreamName in the streaming URL are the same as those in the ingest URL.
Input/Output format	Cloud Stream Live Video packaging protocols RTMP and FLV Video codec: H.264 and H.265, etc. HLS output protocol Video codec: H.264 and H.265, etc. Audio packaging protocols RTMP and FLV Audio codec: AAC, etc. HLS output protocol The supported audio encoding format is AAC. Low Latency Live (LLL) Transmission protocol requirements Signaling transmission protocol: HTTPS, HTTP, and UDP are supported. HTTP listening port 80 is enabled. HTTP and UDP are insecure. Media transmission protocol: UDP and TCP are supported. Media streams can be encrypted. It is recommended that DTLS be used for signaling negotiation, as UDP is insecure. Encoding format requirements Audience: The supported video encoding format is H.264 without B frames, and the supported audio encoding format is OPUS. Streamer: The supported video encoding format is H.264 without B frames, and the supported audio encoding format is AAC (LC/HE). NOTE: If the format of the streaming end does not meet the requirements, you need to create a transcoding template. LLL supports real-time transcoding, and you will be billed for using this function. By default, the system supports the conversion from AAC to OPUS, and no fee is generated. To achieve lower latency, you are advised to set the GOP at the streaming device to 2s. The audio-only or video-only mode is not supported.
Streaming management	This function is available only in the AP-Singapore and CN North-Beijing4 regions.
Recording	This function is unavailable in the AP-Bangkok region.
Transcoding	In the AP-Bangkok region, submit a service ticket for review after configuring a template. The configuration takes effect only after it is approved.
Snapshot capturing
Stream status notifications
Content compliance	Live does not support the access of websites that violate related laws and regulations, including but not limited to: Websites that contain pornographic content or content related to gambling, illegal drugs, frauds, or infringement Gaming websites that run on illegal private servers Websites that provide pirated games/software/videos P2P lending websites Unofficial lottery websites Unlicensed hospital and pharmaceutical websites Inaccessible websites or websites that do not contain any substantial information NOTE: If your acceleration domain name violates related laws and regulations, you shall bear the related risks. If any pornographic content or content related to gambling, illegal drugs, or frauds is found on your domain name, the domain name and other domain names that use the same origin server will be deleted from Live and can no longer access Live. Acceleration domain name quota of the account will be reduced to 0.

API Constraints

The Live 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 request throttling
API Category	API Name	Max. User Requests	Max. API Requests
Domain name management	Creating a domain name Querying domain names	300 times/minute	3000 times/minute
Domain name management	Deleting a domain name Modifying a domain name Mapping domain names Deleting a domain name mapping Configuring the domain name IPv6 switch	100 times/minute	1000 times/minute
Transcoding template management	Creating a transcoding template Deleting a transcoding template Modifying a transcoding template Querying transcoding templates	100 times/minute	1000 times/minute
Stream management	Disabling a push stream Modifying the attribute of a disabled stream	4000 times/minute	12,000 times/minute
	Resuming a push stream Querying disabled streams	3000 times/minute	6000 times/minute
	Querying ongoing streams	1000 times/minute	2000 times/minute
Access control	Querying the URL validation configuration of a specified domain name Modifying the URL validation configuration of a specified domain name Deleting the URL validation configuration of a specified domain name	150 times/minute	300 times/minute
Snapshot management	Creating a snapshot capturing template Modifying a snapshot capturing template Querying snapshot capturing templates Deleting a snapshot capturing template	150 times/minute	300 times/minute
Log management	Obtaining livestreaming logs	300 times/minute	3000 times/minute
Recording management	Creating a recording template Querying recording templates Modifying a recording template Deleting a recording template Querying recording templates Submitting a recording command	300 times/minute	3000 times/minute
Recording management	Creating a video recording index	1200 times/minute	3000 times/minute
Recording callback management	Creating a recording callback Querying recording callbacks Modifying a recording callback Querying recording callbacks Deleting a recording callback	300 times/minute	300 times/minute
HTTPS certificate management	Modifying the HTTPS certificate configuration of a specified domain name Querying the HTTPS certificate configuration of a specified domain name Deleting the HTTPS certificate configuration of a specified domain name	150 times/minute	300 times/minute
OBS bucket management	Granting or canceling authorization of accessing OBS buckets	150 times/minute	300 times/minute
Statistical analysis	Querying the duration of transcoded outputs Querying the number of recording channels Querying the number of snapshots Querying playback profiles	60 times/minute	5000 times/minute
	Querying the peak bandwidth Querying the total playback traffic Querying HTTP status codes Querying upstream bandwidth Querying the number of stream push channels Querying historical streams	20 times/minute	5000 times/minute
	Querying the distribution of livestreaming metrics by region	50 times/second	150 times/second
Stream analytics	Querying the stream frame rate Querying the stream bitrate	20 times/minute	5000 times/minute
	Querying stream analytics	Once per second	5 times/second
	Querying CDN upstream streaming quality data	60 times/second	300 times/second