AWS Elemental MediaLive feature rules and limits

The following table provides a summary of many of the rules and constraints that apply to AWS Elemental MediaLive features. You can't change any of these constraints.

MediaLive also includes quotas, which you can change. For more information about quotas, see Quotas in AWS Elemental MediaLive .

Resource or feature	Constraint or rule
Input number, push inputs	You can attach 0 to 2 push inputs to a channel.
Input number, pull inputs	You can attach up to 20 inputs to a channel. After you have counted the push inputs, the remainder can be pull inputs.
Input number, CDI inputs	You can attach 0 or 1 regular CDI inputs to a channel. This input is a push input, so it counts towards the maximum number of push inputs in the channel. You can attach one set of partner CDI inputs to a channel. Attaching this set uses up the maximum number of push inputs in the channel. For information about these inputs, see Partner CDI inputs.
Input number, Elemental Link inputs	You can attach up to 2 Elemental Link inputs to a channel. Elemental Link inputs are push inputs, so each counts towards your maximum number of push inputs in the channel.
Input number, Elemental Link inputs per MediaLive device	You can create up to 4 inputs (Link inputs) from each MediaLive device. You can then attach each input to a different channel.
Input types – in automatic input failover	You can set up two push inputs as an automatic input failover pair. You can't set up pull inputs as a failover pair. The failover pair uses up your maximum number of push inputs.
	You can't use Elemental Link inputs to implement automatic input failover.
Input types – in multiple-input channels	You can set up a pool of inputs in order to implement input switching. These restrictions apply to the different input types that can be in the pool: You can have multiple MediaConnect inputs attached to one channel, but all those inputs must be in the same two Availability Zones. You can have multiple VPC inputs attached to one channel, but all these inputs must be in the same two Availability Zones. VPC inputs include CDI inputs, RTP VPC inputs, and RTMP VPC inputs. If the channel has both MediaConnect inputs and VPC inputs, all these inputs must be in the same two Availability Zones.
	This restriction applies to the number of inputs of the same type that can be in the pool of inputs: You can attach only 1 Elemental Link input to a channel. Although a rule earlier in this table states that you can attach 2 Elemental Link inputs to a channel, you can do that only in order to set up a standard pipeline input. You can't do it in order to set up for input switching.
Input audio	Maximum of 20 audio selectors in one channel.
Multiplexes	Each multiplex produces only one MPTS. For information about multiplex, see Multiplex and MPTS in AWS Elemental MediaLive.
	All multiplex programs must include video.
Multiplexes, programs in a multiplex	Maximum of 20 programs per multiplex.
	Each program in a multiplex is single use. It is attached only to one multiplex, and you can use it only for that multiplex.
Multiplexes, channels in a multiplex	Each channel contains one and only one output group, of type multiplex. It can't contain any other type of output group.
	Each channel is single use. You can attach it to only one program in the multiplex. You can use it only for that multiplex.
Image Overlays	Maximum of eight different overlays (layers) active at one time in a channel. This means that the video can show up to eight different overlays at the same time. For information about image overlay, see Working with image overlays.
Output, output locking feature	Output locking is supported only with HLS and Microsoft Smooth. Although you enable the feature globally (for the entire channel), it only works with HLS output groups and Microsoft Smooth output groups.
Output, types	Maximum of one archive output groups in a channel. For information about output types, see Supported containers and downstream systems.
	For frame capture encodes: Maximum of three frame capture encodes in a channel. The single encode in a Frame Capture output group, and each (optional) frame capture encode in an HLS output group both count towards this limit. Maximum of three frame capture outputs in each HLS output group. For information about output types, see Supported containers and downstream systems.
	A channel that includes a UHD output can include only one UHD output, and it can't include other types of outputs. The maximum number of channels with UHD is a quota that you can change, as described in Quotas in AWS Elemental MediaLive . The maximum number of outputs in this type of channel is a limitation. You can't change it.
Output, resolutions	Standard definition (SD) video is supported with all codecs. For information about supported output codecs, see Supported codecs for outputs.
	High definition (HD) video is supported with H.264 and H.265.
	Ultra-high definition (UHD or 4K) video is supported with H.264 and H.265. For information about output video resolutions, see Supported codecs for outputs.
Resiliency, automatic input failover	The automatic input failover applies to inputs, not to the entire channel. You can set up failover in only two, paired, inputs. The inputs must be push inputs.
Resiliency, pipeline redundancy	The pipeline redundancy feature (channel class) applies to the channel and all its inputs. The following rules apply to the channels and inputs: Standard channel – You can attach only standard inputs. Single pipeline channel – You can attach single inputs (to omit support for pipeline redundancy) or standard inputs (to allow for easy upgrade of the channel at a later date).
Schedule, maximum number of actions	The schedule can contain a maximum of 1500 actions. You can't change this maximum. This maximum includes stale actions, actions that are in progress, and actions that aren't yet active. If you are near this maximum, you should delete stale actions.
Schedule and input switches	The schedule can contain any number of scheduled input switching actions. For information about input switching, see Input switching in AWS Elemental MediaLive.
	You can switch to a specific input as many times as you want.
Frequency of API requests	5 steady-state TPS (transactions per second)
	30 burst TPS