Customizing a Transcoding Template Group
In addition to the preset templates, you can customize one-in multiple-out transcoding templates based on your needs.
- Log in to the MPC console.
- In the navigation pane, choose Global Settings > Custom Template Groups.
- Click Create Custom Template Group. In the displayed dialog box, specify related parameters.
- Set basic information. See Table 1.
Table 1 Basic information Parameter
Description
Template Name
Enter a maximum of 128 characters. Only letters, underscores (_), and digits are allowed.
Example: MP4_H264
Output Format
Format of an output audio or video file.
The following output formats are supported:
- Video formats: MP4, HLS, DASH+HLS, and DASH
- Audio formats: ADTS and MP3
Note: If you select Audio only, the video parameters are disabled and only audio is transcoded.
- Set video parameters. See Table 2.
If Audio only is selected, the output file does not contain any video information. This option applies to the scenario where audio is extracted from a media file. Perform step 7 to set audio parameters.
Table 2 Basic video parameters Parameter
Description
Video Codec
The H.264 and H.265 formats are supported.
Low Bitrate HD (PVC)
Whether to enable low bitrate HD. The function is disabled by default.
If this function is enabled, the output bitrate is about 20% lower than the configured bitrate.
HLS Segment Duration
Length of an HLS segment. This parameter is only used when Output Format is set to HLS or DASH+HLS.
The value ranges from 2 to 10.
Default value: 5
Unit: s
Dash Segment Duration
Length of a dash segment. This parameter is only used when Output Format is set to DASH or DASH+HLS.
The value ranges from 2 to 10.
Default value: 5
Unit: s
Width (Unit: px)
Width of an output video.
Its value range:- If H.264 is selected for Video Codec, this value is 0 or a multiple of 2 from 32 to 4,096.
- If H.265 is selected for Video Codec, this value is 0 or a multiple of 2 from 160 to 4,096.
Height (Unit: px)
Height of an output video.
Its value range:- If H.264 is selected for Video Codec, this value is 0 or a multiple of 2 from 32 to 2,880.
- If H.265 is selected for Video Codec, this value is 0 or a multiple of 2 from 96 to 2,880.
Bitrate (Unit: kbit/s)
Bitrate of an output video.
The value is 0 or ranges from 40 to 30,000.
You are advised to set it to a recommended value. For details, see Table 3. If Bitrate is set to 0, the recommended bitrate is used.
- If both the video width and height are set to 0, an output video is generated based on the resolution of the input video.
- If the video bandwidth or height is set to 0, the corresponding value is scaled based on the original size.
Table 3 Recommended resolutions and bitrates Video Quality
Recommended Resolution
Recommended Bitrate for H.265 (kbit/s)
Recommended Bitrate for H.264 (kbit/s)
4K
3840x2160
5600
8000
2K
2560x1440
4900
7000
UHD
1920x1080
2100
3000
HD
1280x720
700
1000
SD
854x480
500
600
LD
480x270
200
300
If the bitrate is set to 0 and the configured resolution is not one of the recommended resolutions in the preceding table, use the recommended bitrate for the recommended resolution which is close to the configured resolution.
For example, if the bitrate is set to 0 and the resolution is set to 900x500, the output bitrate is the recommended bitrate for the resolution 854x480, that is, 500 for H.265 and 600 for H.264.
- Click Add to add resolutions and bitrates.
- Configure advanced video parameters. See Table 4.
Table 4 Advanced video parameters Parameter
Description
Maximum I-Frame Interval
Maximum interval between I frames (initial frame during playback).
The value ranges from 2 to 5.
Maximum Consecutive B-Frames
Maximum number of consecutive B-frames (intermediate frames during playback).
Value range:- 0 to 7 for H.264. The default value is 4.
- 0 to 7 for H.265. The default value is 7.
Profile
Video encoding level, which is related to the video codec. It cannot be modified.
- If Video Codec is H.264, the default value is VIDEO_PROFILE_H264_HIGH.
- If Video Codec is H.265, the default value is VIDEO_PROFILE_H265_MAIN.
FPS
Frame rate of an output video file.
The value is 0 or ranges from 5 to 30.
The value 0 indicates that the FPS of the output video is the same as that of the input video.
Maximum Reference Frames
Number of past and future frames affected during decoding.
Its value is:- An integer ranging from 1 to 8 for H.264
- Permanently 4 for H.265
Quality
Quality level of video encoding. It cannot be modified.
Possible values are:- VIDEO_PRESET_HSPEED2
- VIDEO_PRESET_HSPEED
- VIDEO_PRESET_NORMAL (default value)
Black Bar Removal
Whether to automatically detect black bars and remove them.
This function is disabled by default.
- Set audio parameters by referring to Table 5.
If Video only is selected, the output file does not contain any audio information. This option applies to the scenario where video is extracted from a media file.
Table 5 Audio parameters Parameter
Description
Audio Codec
Audio codec.
Possible values include AAC and HEAAC1. The default value is AAC.
Audio Channel
Possible values include Stereo, Mono, and 5.1 Channel. The default is Stereo.
Sampling Rate
Choose one from Auto, 22050, 32000, 44100, 48000, and 96000. The default value is Auto. The unit is Hz.
Auto indicates adaptive sampling.
Bitrate
Bitrate of an output audio.
The value is 0 or an integer ranging from 8 to 1,000.
Unit: kbit/s
- Click OK.
Modifying a Transcoding Template Group
You can modify a custom template group, including the video parameters, audio parameters, and template name, to meet your service requirements.
- Log in to the MPC console.
- In the navigation pane, choose Global Settings > Custom Template Groups.
- Locate the target template group and click Modify in the Operation column.
- Reconfigure the parameters that you want to modify. For details about the parameters, see Creating a Transcoding Template Group.
- Click OK.
Deleting a Transcoding Template Group
You can delete a template group that is no longer used.
- Log in to the MPC console.
- In the navigation pane, choose Global Settings > Custom Template Groups.
- Locate the target template group and click Delete in the Operation column.
- Click Yes.
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