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. Upsampling is not applicable to the frame rate of a transcoded output.
• In the AP-Bangkok region, submit a service ticket for review after configuring a template. The configuration takes effect only after it is approved.
• The resolution and frame rate of a transcoded output cannot be higher than those of the input.

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 Live Transcoding under Media Live.
3. Click Create Transcoding Template. The Transcoding page is displayed on the right, as shown in Figure 1.
   Configure transcoding parameters as instructed by Table 1.

   Figure 1 Creating a transcoding template
   

   Table 1 Transcoding settings

   Parameter	Description
   Template Name	Name of a Media Live transcoding template. You can customize the name in letters, digits, and hyphens (-).
   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 function, you will be billed based on the rates of low-bitrate HD. For details, see Pricing Details.
   Video Encoding	Supported video encoding formats: H.264 H.265 NOTICE: Select only one encoding format for each channel. H.265 is displayed only when Input Type of a created channel is set to SRT_PUSH, HLS_PULL, or SRT_PULL.
   Presets (Optional)	Resolution levels: 360p 540p 720p 1080p 1440p Custom Select a level to see preset values for Video Bitrate and Resolution (W x H) below. Change them 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. Adaptive to source stream: The target bitrate is adaptive to the bitrate of the source file. Default value: Disabled
   Resolution (W x H)	Width and height of the video, in pixel. If the input value of both sides is set to 0, the video is output using the resolution of the source stream. If the value of one side is set to 0, the value of that side will be converted proportionally according to the input value of the other side. Value range: Width: The value must be 0 or a multiple of 2 between 32 and 3,840. Height: The value must be 0 or a multiple of 2 between 32 and 2,160. NOTICE: The transcoded output resolution cannot be higher than the input resolution. If ad insertion is enabled for a channel and the H.265 transcoding template is selected, the resolution of the H.265 transcoding template must be: Width: 320–4,096 Height: 240–2,880
   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. 0 means adaptive frame rate. The transcoded output frame rate cannot be higher than the input frame rate.
   Use Source I-Frame	This function must be enabled for Media Live. After this function is enabled, the I-frame, position, and PTS of the transcoded stream are the same as those of the source stream. In this case, both the source and transcoded streams have the same GOP duration.
   B-Frame Removal	After this function is enabled, the transcoded video does not contain B-frames.

4. Click OK.

   There is a new transcoding template 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.