Creating a Transcoding Template

Function Overview

The transcoding function allows you to:

Notes

• To delete a transcoding template, you need to manually delete it from all channels. Otherwise, the transcoding template still takes effect on the channels.
• The transcoding template of a channel takes effect when the channel playback starts. If the transcoding configuration is modified, the modification takes effect only after the channel is restarted.
• If you enable low-bitrate HD, you will be charged based on the rates of low-bitrate HD. For details about the price, see Live Pricing Details.
• Upsampling transcoding is not supported. If the resolution set in the transcoding template is higher than the original resolution, the transcoded streaming URL can be used for playback, but the played video still uses the original resolution.
• In the AP-Bangkok region, submit a service ticket for review after configuring a template. The configuration takes effect only after it is approved.

Prerequisites

• An ingest domain name has been added.
• CNAME records have been added to your domains' DNS records.

Adding a Media Live Transcoding Template

You can add a Media Live transcoding template on the Live console.

1. Log in to the Live console.
2. In the navigation pane on the left, choose Media Live > Live Transcoding.
3. Click Create Transcoding Template. A page like Figure 1 is displayed.
   Configure transcoding parameters as instructed by Table 1.

   Figure 1 Creating a transcoding template
   

   Table 1 Template parameters

   Parameter	Description
   Template Name	Name of a Media Live transcoding template. You can customize the name. Only letters, digits, underscores (_), and hyphens (-) are allowed.
   Triggered By	Transcoding is triggered by stream push. When a transcoding request is received, the transcoding template whose name is the same as the value of AppName in the request URL takes effect and transcoding starts.
   Transcoding Type	Transcoding type of Media Live. Options: Standard transcoding Low-bitrate HD For the same resolution, low-bitrate HD transcoding consumes 20% less bitrate than standard transcoding but costs more. Low-bitrate HD means a lower output bitrate at a given image quality. If you enable this option, you will be billed based on the rates of low-bitrate HD. For details, see Live Pricing Details.
   Video Encoding	Supported video encoding formats: H.264 H.265 NOTICE: Select only one encoding format for each channel.
   Recommended Resolution	Display resolution. After the resolution level is selected, the Video Bitrate and Resolution (W x H) parameters are automatically set and the recommended values are provided. You can also change the values as needed.
   Video Bitrate	Average bitrate of the transcoded video, in kbit/s. Value range: 40 to 30,000
   Bitrate Control	Bitrate control policy. Options: Disabled: Bitrate adaptation is disabled. The target bitrate is output as specified. Not higher than source stream: The target bitrate is the smaller value between the specified bitrate and the bitrate of the source file. That is, the bitrate does not increase. Adaptive to source stream: The target bitrate is adaptive to the bitrate of the source file.
   Resolution (W x H)	Width and height of the video, in pixel. If both the width and height are set to 0, the output resolution is the same as the source resolution. If only the width or height is set to 0, the output resolution will be scaled based on the value of the side that is not set to 0. Value range: Width: 32 to 3,840. The value must be 0 or a multiple of 2. Height: 32 to 3,840. The value must be 0 or a multiple of 2.
   Video Frame Rate	Frame rate of the transcoded video. Options: Retain the original Set a new one: If you select this option, you need to enter the frame rate. The value ranges from 0 to 60. If the value is set to 0, the frame rate is adaptive.
   Use Source I-Frame	Policy for outputting I-frames during encoding. Enable this function for Media Live. Options: If this function is disabled, I-frames are output based on the configured GOP duration. If this function is enabled, the output I-frames are the same as those of the source. That is, if the source contains I-frames, I-frames are output after encoding. If the source does not contain I-frames, non-I-frames are output after encoding. If this function is enabled, the GOP duration setting is invalid. For multi-bitrate transcoding, you are advised to enable Use Source I-Frame so that videos of different bitrates can have the same I-frame.
   GOP Duration	I-frame interval by time, in second. The value ranges from 0 to 10 and defaults to 2. If the value is not 0, the I-frame interval is set based on the GOP duration. If the value is 0, the default value is used. A larger GOP duration value indicates a longer livestreaming latency. A smaller GOP duration value indicates a higher probability of frame freezing.
   B-Frame Removal	After this function is enabled, the transcoded video does not contain B-frames.

4. Click OK.

   A transcoding template is added on the live transcoding page.

Managing Transcoding Templates

You can perform the following operations on your transcoding template:

• Editing a transcoding template

  Click Edit in the Operation column to modify parameters in the template. If the channel where the transcoding template is located has been started, you need to restart the channel for the modification to take effect. It takes about 30 seconds to restart the channel. During the channel restart, transcoding will be interrupted. After the channel is restarted, transcoding automatically resumes.

• Deleting a transcoding template

  Click Delete in the Operation column.