Settings ID |
The ID of the transcoding template.
The value of the Settings ID parameter is used to construct a URL for a live stream that requires transcoding.
For more information about how to construct a URL, see Ingest and streaming URLs. You can append the template ID to the streaming URL to watch the transcoded stream
in the specified resolution.
Important The template ID must be different from default transcoding template IDs. The default
transcoding template IDs include lld, lsd, lhd, lud, ld, sd, hd, and ud.
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Template Type |
Transcoding type:Narrowband HD™ templates and audio-only templates are supported.
Audio-only transcoding templates are used to remove the video of the input stream
and generate an audio-only stream in the Opus format.
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Resolution |
The resolution of the output stream. Unit: pixels. Different types of resolutions
correspond to different prices. The following types of resolutions are supported:
- Low definition (LD): 640 × 480 and lower
- Standard definition (SD): 1280 × 720 and lower
- High definition (HD): 1920 × 1080 and lower
- 2K: 2560 × 1440 and lower
- 4K: 3840 × 2160 and lower
Note When you use multi-bitrate transcoding, you are charged based on the resolution types
specified in the multi-bitrate transcoding template,but not based on the resolution
types specified in the Narrowband HD™ template for common transcoding. The Narrowband
HD™ template supports the following resolutions: LD, SD, HD, and ultra high definition.
The resolution of an output stream is determined based on the range where the long
side and short side of the video image fall.
In the following example, the resolution of 1280 × 720 is used to demonstrate how
the resolution of an output stream is determined.
- If the long side of the video image contains no more than 1,280 pixels and the short
side of the video image contains no more than 720 pixels, the resolution of the output
stream is SD.
- If the long side of the video image contains more than 1,280 pixels, or the short
side of the video image contains more than 720 pixels, the resolution of the output
stream is higher than SD.
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Video Bitrate |
The bitrate that corresponds to the resolution. Unit: Kbit/s. The following list describes the bitrate ranges for different resolutions:
- LD: 100–800 Kbit/s
- SD: 200–1,500 Kbit/s
- HD: 500–4,000 Kbit/s
- 2K: 2,000–8,000 Kbit/s
- 4K: 4,000–30,000 Kbit/s
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Video Frame Rate |
The frame rate of the output stream. Unit: frames per second. The frame rate of the
output stream must be smaller than or equal to the frame rate of the input stream.
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Video GOP |
The group of pictures (GOP) indicates the interval between two I-frames. The GOP of
the output stream must be smaller than or equal to the GOP of the input stream. The
GOP of the output stream cannot exceed 3 seconds. This ensures low latency.
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Encoding Standard (applicable only to Audio Only)
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Only Advanced Audio Coding (AAC) is supported. |
Codec (applicable only to Audio Only)
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- LC-AAC: advanced audio coding with low complexity. The transcoding efficiency is high.
- HE-AAC: advanced audio coding with high efficiency. The sound effect for HE-AAC is
better than that for LC-AAC when the audio bitrate is lower than 128 Kbit/s.
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Bitrate (applicable only to Audio Only)
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The audio bitrate. Valid values: 8 to 1000. |
Channels (applicable only to Audio Only)
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The number of sound tracks. Valid values: 1 and 2. |
Maximum Bandwidth |
We recommend that you set this parameter to a value that is higher than the video
bitrate.
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