Limits - ApsaraVideo VOD - Alibaba Cloud Documentation Center

This topic describes the default limits in ApsaraVideo VOD, including the limits on resource usage and the number of API calls.

Resource type	Limit	References
Domain name	A maximum of 20 domain names can be configured within an Alibaba Cloud account. Make sure that your domain names have Internet content provider (ICP) filings.	Add a domain name for CDN
Resource refreshing and prefetching	A maximum of 2,000 URLs and 100 directories can be refreshed per day and a maximum of 500 URLs can be prefetched per day. You cannot prefetch content based on directories.	Refresh and prefetch
Storage	Only one system bucket is allocated per region.	Manage storage buckets
Category	A maximum of three levels of categories can be created in each category tree within an Alibaba Cloud account. Each category can contain a maximum of 100 subcategories.	Media asset categories
Custom tag	A maximum of 16 tags can be specified for a video.	Media asset management
Workflow	A maximum of 20 workflows can be created within an Alibaba Cloud account.	None.
Transcoding template group	A maximum of 20 transcoding template groups can be configured within an Alibaba Cloud account.	Configure regular transcoding templates
Review, editing, and snapshot templates	A maximum of 20 review templates, editing templates, and snapshot templates can be configured within an Alibaba Cloud account.	Configure regular transcoding templates
Transcoding templates configured in a transcoding template group	A maximum of 20 transcoding templates can be configured in a transcoding template group.	Configure regular transcoding templates
Watermark	A maximum of 20 watermarks can be configured within an Alibaba Cloud account.	Manage watermarks
Watermarks associated with a transcoding template	A maximum of five watermarks can be configured for a transcoding template.	Configure regular transcoding templates
Online editing	You can edit media files that are stored only in the same region.	Use online editing
Callback URL	Only one event callback setting can be configured for each region within an Alibaba Cloud account.	Configure callbacks
Bandwidth	If you use the pay-by data-transfer or pay-by-bandwidth metering method for a domain name, the bandwidth consumed within a minute cannot exceed 10 Gbit/s.	None. Note To disable bandwidth throttling, contact your account manager or submit a ticket.

Limits on server API calls

By default, ApsaraVideo VOD limits the frequency of calling server API operations. If the number of requests for calling an API operation exceeds the upper limit, these excess requests are rejected.

When the upper limit is reached, ApsaraVideo VOD rejects the excess requests in a random manner and returns a 400 status code. The error code is Throttling.User, and the error message is "Request was denied due to user flow throttling."

Limits on API operations

ApsaraVideo VOD limits the queries per second (QPS) of API calls for each account. Requests that exceed this limit are dropped. For more information about QPS limits, see QPS limits on API operations.

Limits on IP addresses

By default, the number of requests from an IP address is limited to 300 per second. Note that the limit is applicable to Internet egress IP addresses.

ICP filing

You can determine whether an ICP filing is required for a domain name for Alibaba Cloud CDN that is added to ApsaraVideo VOD based on the acceleration region. If you select Chinese Mainland (ICP Filing Required) or Global (ICP Filing Required) when you add a domain name, an ICP filing is required. We recommend that you apply for an ICP filing on the ICP Registration Support page.

Note

If you want to accelerate content delivery for ApsaraVideo VOD in the Chinese mainland, you must apply for an ICP filing for the domain name of your application on your origin server.

Content moderation

Warning

You are legally responsible for the content that is hosted on your accelerated domain name. ApsaraVideo VOD regularly reviews the content of accelerated domain names. If illicit content is detected from a domain name, ApsaraVideo VOD immediately disables or blocks the domain name. In serious cases, ApsaraVideo VOD may permanently block all domain names that belong to the Alibaba Cloud account.
If you add a wildcard domain name such as *.aliyundoc.com to ApsaraVideo VOD and a specific domain name that matches the wildcard domain such as example.aliyundoc.com contains illicit content, ApsaraVideo VOD disables the wildcard domain name *.aliyundoc.com.

All accelerated domain names that are added to ApsaraVideo VOD must be reviewed. The accelerated domain names that cannot be added to ApsaraVideo VOD include but are not limited to the following types:

Domain names that cannot be accessed or do not contain valid information
Domain names of websites that run on illegal private servers
Domain names of websites that provide multiplayer games and card games
Domain names of websites that provide unauthorized software downloads
Domain names of peer-to-peer (P2P) lending websites
Domain names of unofficial lottery websites
Domain names of unlicensed and pharmaceutical websites
Domain names of websites that contain illicit content, such as pornography, illegal drugs, and gambling

If the review request for your domain name is rejected, you can perform the following steps to check the reason: Log on to the ApsaraVideo VOD console. In the left-side navigation pane, choose Configuration Management > CDN Configuration > Domain Names. On the page that appears, view the rejection reason. Then, you can modify the content and submit the domain name for review again.

Limits on media transcoding

Item	Type	Limit
Platform	N/A	You can transcode media files on terminals such as mobile devices, TVs, PCs, web browsers, mini programs, and virtual reality (VR) platforms.
Input file	Video	MPEG formats: MP4, TS, 3GP, MPG, MPEG, MPE, DAT, VOB, and ASF. AVI format: AVI. Windows Media Video formats: WMV and ASF. Flash Video formats: FLV and F4V. Real Video formats: RM and RMVB. QuickTime format: MOV. Matroska format: MKV. HTTP-Live-Streaming (HLS) format: M3U8. Note If you use the ApsaraVideo VOD console to upload M3U8 files, you can upload them only by using their URLs. You can use the ApsaraVideo VOD API or SDK to upload M3U8 files from your on-premises devices. For more information, see Upload media files by calling the ApsaraVideo VOD API. Other formats: DV, GIF, M2T, M4V, MJ2, MJPEG, MTS, OGG, QT, SWF, and WEBM.
	Audio	Only audio files in the following formats are supported: MP3, WMA, WAV, AAC, RA, M4A, FLAC, APE, AC3, AMR, CAF, and ACM.
	Image	Only image files in the following formats are supported: PNG, JPG, JPEG, GIF, and HEIC.
	Auxiliary media asset	Watermark files: PNG, GIF, APNG, and MOV. Subtitle files: SRT, ASS, STL, TTML, and VTT. Material files: JPG, GIF, PNG, MP4, MAT, and ZIP.
	File size	The maximum size of a file that you can transcode is 100 GB. Note If you want to efficiently upload large files, submit a ticket to obtain technical support. For more information about how to submit a ticket, see Contact us.
	Chroma	Examples: 4:2:2 and 4:2:0.
Output file	Container format	Supported container formats for video files: HLS, MP4, and FLV. Supported container format for audio files: MP3. Supported container formats for image files: GIF and WebP. Important If you set the container format to GIF, you can set the video codec only to GIF. If you set the container format to WebP, you can set the video codec only to WebP. If you set the container format to FLV, you cannot set the video codec to H.265.
	Video codec	The following video codecs are supported: Apple ProRes, AV1, AVC-Introa, AVS2, H.263, H.264/AVC, H.265/HEVC, MPEG-1, MPEG-2, MPEG-2 422, MPEG-4, VP8, VP9, GIF, and WebP.
	Audio codec	The following audio codecs are supported: AAC, AC3, AMR, EAC3, FLAC, MP3, PCM, Vorbis, and Windows Media Audio.
	Encoding profile	The baseline, main, and high encoding profiles are supported for the H.264 video codec.
	Resolution	Valid values if you use the H.264 video codec: `[128,4096]`. Unit: pixels. Valid values if you use the H.265 video codec: `[128,8192]`. Unit: pixels.
	Bitrate	Valid values if you use the H.264 video codec: `[10,50000]`. Unit: Kbit/s. Valid values if you use the H.265 video codec: `[10,200000]`. Unit: Kbit/s.
	Frame rate	Valid values: `(0,60]`. Unit: FPS.
	Sampling bit depth	If you use the H.264 video codec, the bit depth is 8 bits. If you use the H.265 video codec, the bit depth can be up to 12 bits.
	Color format	The yuv420p and yuvj420p pixel formats are supported. If you want to use a standard pixel format such as pc, bt470bg, or smpte170m, you must configure compatibility with a standard pixel format.
	Bitrate control	The following bitrate control methods are supported: VBR, CBR, ABR, and CRF.
	Scan mode	The following scan modes are supported: interlaced scan, progressive scan, and auto scan.
No Transcoding	N/A	You can use the built-in No Trancoding template group to process videos in the following formats and directly play them: MP4, FLV, M3U8, MP3, and WebM.
Container format conversion	N/A	You can convert the container format of a media file without compromising the file quality. The following container formats are supported: MP4, FLV, M3U8, MP3, and WebM.

Increase upper limits

If you want to increase the upper limits described in this topic, contact Alibaba Cloud customer service or submit a ticket and provide information about your business scenario and the upper limits that you want to configure for your business. For example, describe the upper limits for the number of domain names and number of calls to the playback operation.