This topic describes the limits of ApsaraVideo Media Processing (MPS).
Limits on features
| Item | Limit | Scenario |
|---|---|---|
| MPS queue | By 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 queue | Each MPS queue can contain up to 10,000 jobs. | Submit an MPS job. |
| Concurrent jobs in an MPS queue | The 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 template | A 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 template | A 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. |
| Workflow | A 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 type | Whether high-speed transcoding is supported |
|---|---|
| Regular transcoding | Supported |
| Audio transcoding | Not supported |
| Container format conversion | Not supported |
| Narrowband HD™ 1.0 | Supported |
| Narrowband HD™ 2.0 | Supported |
| Super resolution | Supported |
| Frame interpolation | Supported |
| Video repair | Supported |
| SDR to HDR | Supported |
| HDR to SDR | Supported |
| SDR+ | Supported |
| Dolby audio | Not supported |
| Transcoding feature | Parameter of an API operation | Whether high-speed transcoding is supported |
|---|---|---|
| Two-pass encoding | N/A | Supported |
| Audio extraction | Remove | Not supported |
| Video extraction | Remove | Not supported |
| Black bar removal | Crop | Supported |
| Video cropping | Crop | Supported |
| Black bar addition | Pad | Supported |
| Auto-rotate screen | LongShortMode | Supported |
| Video rotation | Rotate | Supported |
| Video merging | MergeList or MergeConfigUrl | Not supported |
| Video clipping | Clip | Supported |
| Video head and tail | OpeningList and TailSlateList | Not supported |
| Blurring | DeWatermark | Not supported if timelines are involved |
| Audio mixing | Amix | Not supported |
| Watermarking | WaterMarks | Not supported if timelines are involved |
| Subtitle hardcoding | SubtitleConfig | Not supported |
| Packaging | HLS and DASH | Not supported |
| HTTP Live Streaming (HLS) encryption | N/A | Not supported |
| Alibaba Cloud proprietary cryptography | N/A | Supported |
| Digital rights management (DRM) encryption | N/A | Not supported |