Constraints

It is available in the AP-Singapore region.
It only supports Chinese text.
The text to be detected must be encoded using UTF-8 and can contain a maximum of 1,500 characters. If the text contains more than 1,500 characters, only the first 1,500 characters are detected.
By default, the maximum number of concurrent API calls is 50 (a maximum of 50 requests within a second). To increase concurrency, submit a service ticket.
There are fewer constraints at the Huawei Cloud International website than the Chinese Mainland website. For details, you can submit a service ticket to contact Huawei Cloud technical support.

It is available in CN-Hong Kong, AP-Singapore, and LA-Santiago.
It only supports Chinese text.
The text to be detected must be encoded using UTF-8 and can contain a maximum of 5,000 characters. If the text contains more than 5,000 characters, only the first 5,000 characters are detected.
In CN-Hong Kong, AP-Singapore, and LA-Santiago, the maximum number of concurrent API calls is 5 (a maximum of five requests within a second) by default. To increase the concurrency, submit a service ticket to seek help from our professional engineers.

It is available in the AP-Singapore region.
It supports images in JPG, PNG, JPEG, WEBP, GIF, TIFF, TIF and HEIF formats.
Each edge of an image must contain 20 to 6,000 pixels.
A Base64-encoded image cannot be larger than 10 MB (the original image cannot be larger than 7.5 MB).
By default, the maximum number of concurrent API calls is 10 (a maximum of 10 requests within a second). To increase the concurrency, submit a service ticket to seek help from our professional engineers.
There are fewer constraints at the Huawei Cloud International website than the Chinese Mainland website. For details, you can submit a service ticket to contact Huawei Cloud technical support.

It is available in CN-Hong Kong, AP-Singapore, and LA-Santiago.
Only images in PNG, JPEG, BMP, WEBP, or GIF format can be recognized.
No side of the image can be smaller than 10 or larger than 10,000 pixels.
The size of the Base64 encoded image cannot exceed 10 MB (the size of the original image cannot exceed 7.5 MB).
In CN-Hong Kong, AP-Singapore, and LA-Santiago, the maximum number of concurrent API calls is 1 (a maximum of one request within a second) by default. To increase the concurrency, submit a service ticket to seek help from our professional engineers.

It is available in the AP-Singapore region.
Audio files in WAV, MP3, AAC, AMR, 3GP, M4A, WMA, OGG, APE, FLAC, ALAC, WAVPACK and SILK_V3 formats are supported.
The video size cannot exceed 200 MB.
By default, the maximum number of concurrent API calls is 10 (a maximum of 10 requests within a second). To increase the concurrency, submit a service ticket to seek help from our professional engineers.

It is available in AP-Singapore.
Formats such as AVI, FLV, MP4, MPG, WMV, MOV, WMA, RMVB and m3u8 are supported.
The video file size cannot exceed 300 MB, and the video duration cannot exceed 2 hours.
By default, the maximum number of concurrent API calls is 10 (a maximum of 10 requests within a second). To increase the concurrency, submit a service ticket to seek help from our professional engineers.
There are fewer constraints at the Huawei Cloud International website than the Chinese Mainland website. For details, you can submit a service ticket to contact Huawei Cloud technical support.

It is available in the AP-Singapore region.
Audio stream URL. Mainstream protocols such as RTMP, RTMPS, HLS, HTTP, and HTTPS are supported.
By default, the maximum number of concurrent API calls is 10 (a maximum of 10 requests within a second). To increase the concurrency, submit a service ticket to seek help from our professional engineers.