Cloud Live

Before using Cloud Live, understand the following constraints.

Constraints

**Table 1** Constraints
Item	Description
Concurrent livestream	There is no limit on the number of concurrent livestreams. However, if the concurrency exceeds 100 Gbit/s, you can submit a service ticket for technical consulting.
Stream push	There is no limit on the bitrate. Common resolutions and bitrates are supported. To ensure smooth streaming, a bitrate no greater than 4 Mbit/s is recommended.
Playback	You can play a livestream only after the ingest and streaming domain names are associated. The values of AppName and StreamName in the streaming URL must be 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 Audio codec: 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 device is not supported, you need to create a transcoding template. LLL supports real-time transcoding, and you will be billed for using this function. The conversion from AAC to OPUS is supported and no fee will be generated. To reduce latency, you can set the GOP at the streaming device to 2s.
Streaming management	This function is available only in CN North-Beijing4, AP-Singapore, and EU-Dublin.

API Constraints

Live 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
	Deleting a domain name Modifying a domain name Mapping domain names Deleting a domain name mapping Configuring the domain name IPv6 switch Modifying the HLS configuration of a domain name Querying HLS configurations of domain names	100 times/minute	1000 times/minute
	Querying IP address information	5 times/second	5 times/second
	Modifying the streaming domain name delay Modifying origin pull settings	30 times/minute	100 times/minute
	Querying the streaming domain name delay Querying origin pull settings	30 times/minute	300 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
	Querying disabled streams Resuming a push stream	3000 times/minute	6000 times/minute
	Querying ongoing streams	1000 times/minute	2000 times/minute
Notification management	Adding and modifying stream notification configurations Querying stream notification configurations Deleting stream notification configurations	300 times/minute	3000 times/minute
Authentication	Configuring a referer validation ACL Deleting a referer validation ACL Querying referer validation ACLs Querying IP ACLs Modifying an IP ACL Generating a signed URL	300 times/minute	3000 times/minute
	Querying supported areas of a streaming domain name	30 times/minute	300 times/minute
	Modifying supported areas of a streaming domain name	30 times/minute	100 times/minute
	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 template configurations 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
	Querying stream data of a streaming domain name	20 times/second	50 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