This topic describes the limits of ApsaraVideo Media Processing (MPS).

Limits on features

ItemLimitScenario
MPS queueBy default, a standard MPS queue and an MPS queue for intelligent production are activated for each Alibaba Cloud account in each region. For more information about how to create or activate MPS queues of other types, see Manage MPS queues. Create an MPS queue in the MPS console.
Jobs in an MPS queueEach MPS queue can contain up to 10,000 jobs. Submit an MPS job.
Concurrent jobs in an MPS queueThe maximum number of jobs that can concurrently run in an MPS queue depends on resources. For more information about the default concurrency of MPS queues, see Manage MPS queues. Submit an MPS job.
Custom transcoding templateA maximum of 10 custom transcoding templates can be created within an Alibaba Cloud account in each region. Create a transcoding template in the MPS console. For more information, see Transcoding templates.
Custom watermark templateA maximum of 10 custom watermark templates can be created within an Alibaba Cloud account in each region. Create a watermark template in the MPS console. For more information, see Manage watermark templates.
WorkflowA maximum of 10 workflows can be created within an Alibaba Cloud account in each region. Create a workflow in the MPS console. For more information, see Create a workflow.
Queries per second (QPS)MPS limits the QPS of a single account for some API operations. For more information, see QPS limit. Call API operations of MPS.

Limits on high-speed transcoding

High-speed transcoding is not supported for all videos. Before you enable high-speed transcoding, make sure that your video meets the following requirements.

Requirements on input files

  • File type: The input file must be a video and cannot be audio-only.
  • Video length: The length of the input file must be greater than 10 minutes. We recommend that you upload a video whose length is greater than 30 minutes.
  • Encoding format: The input file must be encoded in the H.264 or H.265 format, and cannot be encoded in the vp9, ac3, or ec3 format.

Requirements on output files

The output resolution must be 4K or lower.

Support for high-speed transcoding

High-speed transcoding is not supported for audio-only files. High-speed transcoding is supported for videos in scenarios other than container format conversion and transcoding in which timelines are involved. The following table describes the details.

Transcoding typeWhether high-speed transcoding is supported
Regular transcodingSupported
Audio transcodingNot supported
Container format conversionNot supported
Narrowband HD™ 1.0Supported
Narrowband HD™ 2.0Supported
Super resolutionSupported
Frame interpolationSupported
Video repairSupported
SDR to HDRSupported
HDR to SDRSupported
SDR+Supported
Dolby audioNot supported
Transcoding featureParameter of an API operationWhether high-speed transcoding is supported
Two-pass encodingN/ASupported
Audio extractionRemoveNot supported
Video extractionRemoveNot supported
Black bar removalCropSupported
Video croppingCropSupported
Black bar additionPadSupported
Auto-rotate screenLongShortModeSupported
Video rotationRotateSupported
Video mergingMergeList or MergeConfigUrlNot supported
Video clippingClipSupported
Video head and tailOpeningList and TailSlateListNot supported
BlurringDeWatermarkNot supported if timelines are involved
Audio mixingAmixNot supported
WatermarkingWaterMarksNot supported if timelines are involved
Subtitle hardcodingSubtitleConfigNot supported
PackagingHLS and DASHNot supported
HTTP Live Streaming (HLS) encryptionN/ANot supported
Alibaba Cloud proprietary cryptographyN/ASupported
Digital rights management (DRM) encryptionN/ANot supported