You can preset different processing parameters for different application scenarios by configuring audio/video transcoding templates, so that they can be reused later.
If you need to process video files, you can configure video transcoding templates, including general video transcoding templates, TSC transcoding templates, video adaptive bitrate streaming templates, and remuxing templates.
If you need to process audio-only files, you can configure audio transcoding templates, including general audio transcoding templates, TSC audio transcoding templates, and audio adaptive bitrate streaming templates.
For a brief introduction to each feature, refer to the table below:
Applicable Input Source
Feature
Description
Video
General transcoding
It can reduce the video bitrate and change the encoding standard, resolution, frame rate, and other parameters of the original bitstream, thus adapting to playback on different terminals and in different network environments.
TSC transcoding
TSC transcoding is an "upgrade" of General Transcoding. It can adaptively optimize different types of videos, providing users with a clearer viewing experience at lower bandwidth. While ensuring or even improving image quality, it can save bandwidth costs by 50%+.
Video adaptive bitrate streaming
It can convert the input original video file into multiple bitstreams suitable for playback in different scenarios, so that users can choose a video with an appropriate bitrate for playback based on their network, thereby enhancing user experiences.
Remuxing
It can change the container format of the original video file.
Audio
General audio transcoding
It can reduce the audio bitrate and change the encoding standard, sample rate, channel, and other parameters, thus adapting to playback on different terminals and in different network environments.
TSC audio transcoding
TSC audio transcoding is an "upgrade" of general audio transcoding. It can adaptively optimize different types of audio to provide users with a better audio experience with lower bandwidth.
Audio adaptive bitrate streaming
It can convert the input original audio file into multiple bitstreams suitable for playback in different scenarios, thereby adapting to different network conditions and enhancing user experiences.
Video Transcoding Templates
1. General Transcoding
MPS provides preset General Transcoding Templates, which can be added directly to a scheme. You can also click Create template to customize your own General Transcoding Templates.
Table of Detailed Configuration Item Description
Item
Description
Template name
Max 64 characters; supports Chinese characters, letters, digits, spaces, underscores (_), hyphens (-), and periods
Max 64 characters; supports Chinese characters, letters, digits, underscores (_), hyphens (-), and periods.
Container format
MP4, FLV, HLS, MXF, MOV, TS, WEBM, MKV.
Configuration Item
Video parameters (required) and audio parameters++ (optional)++.
Segmentation Rules
(configurable when the container format is HLS)
Multipart Format
TS, MP4.
Data Sharding
Segment File (segment), Single File (single-file).
Note: Single File requires the server to support byte range requests. Not all HLS devices and players support a single file/byte range.
Average Segmentation Duration
The following two methods are supported:
Automatic
Custom: Fill in the average segment duration (in s).
Segment Duration at Startup
This configuration item is disabled by default.
Once it is enabled, you can set a special average duration for the first few segments of the video. For example, set the first segment to have a shorter duration than other segments to reduce video buffering time and improve user experiences. Enter an integer value greater than or equal to 1.
Number of Effected Segments
It is used to specify the number of the first few video segments to take effect when Segment Duration at Startup is enabled. Enter an integer value greater than or equal to 1.
The following four bitrate control modes are supported:
1. VBR (default): variable bitrate. The bitrate of the output is adjusted dynamically based on the complexity of video images, resulting in higher image quality. It is suitable for storage scenarios as well as applications requiring high image quality.
2. ABR: average bitrate. The average bitrate of the output video is kept stable to the greatest extent, but short-term bitrate fluctuations are allowed. It is suitable for scenarios where minimizing the overall bitrate is required while a certain image quality is maintained.
3. CBR: constant bitrate. The bitrate of the output is kept constant during the video encoding process without considering changes in image complexity. It is suitable for scenarios with strict network bandwidth requirements.
4. CRF: constant quality factor. Video quality is controlled by setting a quality factor to achieve constant quality encoding of videos, with the bitrate adjusted automatically based on the complexity of the content. It is suitable for scenarios requiring stable image quality.
CRF Value
The following two methods are supported:
Automatic: The CRF value is automatically selected.
Custom: The range of the CRF value is 0 to 51, where 0 means lossless compression and 51 means maximum compression. The typically recommended value range is 18 to 28, where 18 represents a low compression ratio with high quality and 28 represents a high compression ratio with low quality.
Proportional Compression Bitrate
Disabled (default).
Enabled: The bitrate of the output video will be adjusted based on the input compression ratio.
Compression Ratio
It is used when Proportional Compression Bitrate is enabled. The compression ratio is an integer within the range of [0, 100].
Recommended Settings
Select the desired output video quality, such as Standard Definition (SD), and the preset video bitrate, resolution, and audio bitrate will be automatically populated for you.
Note: different encoding standards have varying recommended parameters. For more details, refer to the Appendix.
Average Bitrate
The following two modes are supported:
No video bitrate limit is set.
Custom: It is customized within the range of [128, 35000] (in Kbps).
Resolution
The following three modes are supported:
Keep the original: The resolution is consistent with that of the source video.
Scale: The image is scaled proportionally according to the long or short side (width or height), with a size range of [128, 4096] (in px).
Custom: Both the long and short sides (width and height) can be scaled in custom proportion, with a size range of [128, 4096] (in px).
Display Aspect Ratio (SAR)
It is used when the resolution is set to Custom and the aspect ratio of the video differs from that of the source video. The sample aspect ratio (SAR) refers to the pixel aspect ratio of the video and is used to specify the shape of pixels. The following three modes are supported:
Keep the origin (default)
1 : 1
2 : 1
Padding Rules
It is used when the resolution is set to Custom and the aspect ratio of the video differs from that of the source video. The following five modes are supported:
Scale to fill: This will scale the video image to fill the entire display area, which may cause distortion.
Black bars: (default) Black bars are added around the video to maintain the original aspect ratio, which may waste some display space.
White bars: It is similar to the mode of black bars, but white bars are added on the top and bottom/left and right sides of the video.
Gaussian Blur: Applies a Gaussian Blur effect to the stretched or filled areas to reduce visual discomfort.
Intelligent cropping: The video image to be retained is intelligently selected at the time of video cropping.
Frame Rate
The following two video frame rate setting modes are supported:
Keep the original: The frame rate is consistent with that of the source video.
Custom: The frame rate is customized within the range of [1, 120] (in FPS). If the set value exceeds the source frame rate, duplicate frames will be inserted to make up for it.
GOP
Same Origin of GOP Structure
Disabled (default).
Enabled: The GOP is consistent with that of the source file. Once it is enabled, no other GOP parameters need to be set.
GOP Length
The following two modes are supported:
Automatic
Custom: Enter an integer number of frames or duration (in seconds).
Adaptive I-Frame Decision
Disabled (default).
Enabled: MPS will automatically identify transition points between different scenarios in the video and adaptively insert keyframes (I-frames) at these points, thereby improving the video's random accessibility and encoding efficiency.
Enabled: It is used to set the GOP duration of the video at startup (in seconds).
GOP Quantity at Startup
It is used when GOP Duration at Startup is enabled.
It is used to set the first x GOPs of the video to take effect at startup, where x is input by the user.
More
Encoder Level
The default value is Automatic.
If H.264 is selected as the encoding standard, the following options are supported: Automatic, 1, 1.1, 1.2, 1.3, 2, 2.1, 2.2, 3, 3.1, 3.2, 4, 4.1, 4.2, 5, and 5.1.
If H.265 is selected as the encoding standard, the following options are supported: Automatic, 1, 2, 2.1, 3, 3.1, 4, 4.1, 5, 5.1, 5.2, 6, 6.1, 6.2, and 8.5.
If H.266, MV-HEVC, or AV1 is selected as the encoding standard, this option is not available.
profile
This configuration item is available only when H.264 is selected as the encoding standard. Different profiles are suitable for different scenarios.
Auto(default): Automatically select the most suitable profile.
Baseline: Supports only I/P frames and non-interlaced scenarios, suitable for video calls and mobile videos.
Main: The mainstream profile, providing I-frames, P-frames, and B-frames. It supports both non-interlaced and interlaced modes, mainly used in mainstream audio and video consumer products like video players and streaming media transmission devices.
High: The highest encoding level, adding 8x8 prediction to Main Profile and supporting customized quantization, widely used in Blu-ray storage and high-definition television.
Bit
8 ++(default)++, 10.
Keep Original Timestamp
Disabled (default)
Enabled
Audio Parameters
Audio Transcoding
Enabled: Audio transcoding parameters can be set.
Disabled: The original audio is used.
Encoding standard
When the container format is MP4, the corresponding encoding standards are AAC and MP3.
When the container format is FLV, the corresponding encoding standard is AAC.
When the container format is HLS, the corresponding encoding standard is AAC.
When the container format is MXF, the corresponding encoding standards are PCM16 and PCM24.
When the container format is MOV, the corresponding encoding standards are AAC and MP3.
When the container format is TS, the corresponding encoding standards are AAC and MP3.
When the container format is WEBM, the corresponding encoding standard is Opus.
When the container format is MKV, the corresponding encoding standards are AAC and Opus.
Sample rate
7350, 8000, 11025, 12000, 16000, 22050, 24000, 32000, 44100, 48000, 64000, 88200, 96000, in Hz.
Bitrate
The following two modes are supported:
Keep the original
Custom: It is customized within the range of [26, 256] (in Kbps).
Channel
Mono-channel, Dual-channel, Multichannel.
2. TSC Transcoding
MPS provides preset Top Speed Codec (TSC) templates, which can be added directly to a scheme. You can also click Create template to customize your own TSC templates.
MPS provides preset Video Adaptive Bitrate Streaming Templates, which can be added directly to a scheme. You can also click Create template to customize your own Video Adaptive Bitrate Streaming Templates.
Table of Detailed Configuration Item Description
Item
Description
Template Name
Support Chinese characters, letters, digits, underscores, hyphens, and dots, with a length of up to 64 chars.
Template Description
Support Chinese characters, letters, digits, underscores, hyphens, and dots, with a length of up to 256 chars.
Packaging Format
HLS, MPEG-DASH
Resolution
Disallow low resolution video to high resolution conversion
Allow low resolution video to high resolution conversion: Transcoding a low-resolution original video to high resolution does not directly enhance the image quality. If you desire to improve the quality effect of the video, you can use the Audio and Video Enhancement feature.
Multipart Format
(HLS Packaging Options)
MP4, MP4+Packed Audio, TS, TS+Packed Audio.
Data sharding (HLS Packaging Options)
Segment File (segment), Single File (single-file).
Substream Information
Templates
Choose sub-stream parameters using the Standard Transcoding Template or TSC Transcoding Template
Video Parameters
Encoding standard
H.264, H.265, AV1
Bitrate & Resolution
Refer to the Bitrate & Resolution section of the General Transcoding or TSC Transcoding Template.
Frame Rate
Refer to the Frame Rate section of the General Transcoding or TSC Transcoding Template.
GOP
Refer to the GOP section of the General Transcoding or TSC Transcoding Template.
More
Refer to the More section of the General Transcoding or TSC Transcoding Template.
Audio Parameters
Refer to the Audio Parameters section of the General Transcoding or TSC Transcoding Template.
4. Remuxing Template
The system provides remuxing templates, which you can directly use in the service orchestration management. Currently, the system provides templates for transcoding to MP4 and HLS formats, with no support for custom remuxing templates.
System Preset Remuxing Template List
Template Name
Template ID
Container Format
Transformat-MP4
9
MP4
Transformat-HLS
6
HLS
Appendix:Recommended Settings
To accommodate varying requirements for video clarity, it is recommended that you configure the video bitrate, resolution, and audio bitrate according to the following suggested parameters. Please note:
The recommended settings vary across different encoding standards. For instance, the suggested video bitrate under the H.265 encoding standard is generally 60% of that recommended for the H.264 encoding standard.
Compared to standard video transcoding, ultra-high-definition rapid transcoding recommends a lower video bitrate configuration.
MPS provides preset General Audio Transcoding Templates, which can be added directly to a scheme. You can also click Create template to customize your own General Audio Transcoding Templates.
Table of Detailed Configuration Item Description
Item
Description
Template Name
Support Chinese characters, letters, digits, underscores, hyphens, and dots, with a length of up to 64 chars.
Container Format
MP3, FLAC, OGG, M4A.
Audio Parameter Encoding Standard
When the container format is MP3, the corresponding encoding standard is MP3.
When the container formats are FLAC and OGG, the corresponding encoding standard is FLAC.
When the container format is M4A, the corresponding encoding standards are MP3, AAC, and AC3.
Sample Rate
Multiple sample rates such as 32000Hz, 44100Hz, and 48000Hz are supported.
Bitrate (Audio Bitrate)
The audio bitrate can be the same as that of the source file or be customized within the range of [26, 256] (in Kbps).
Sound Channel
Mono-channel, Dual-channel.
Templates created are displayed in the General Audio Transcoding Template list. You can view, edit, or delete custom templates, but preset templates can be viewed only, not edited or deleted.
System Preset General Audio Transcoding Template List
Template Name
Template ID
Format
Bitrate
Codec
SoundSystem
SampleRate
Audio-M4A-24Kbps
1100
M4A
24kbps
AAC
Stereo
44100Hz
Audio-M4A-48Kbps
1110
M4A
48kbps
AAC
Stereo
44100Hz
Audio-M4A-96Kbps
1120
M4A
96kbps
AAC
Stereo
44100Hz
Audio-M4A-192Kbps
1130
M4A
192kbps
AAC
Stereo
44100Hz
Audio-M4A-256Kbps
1140
M4A
256kbps
AAC
Stereo
44100Hz
Audio-MP3-128Kbps
1010
MP3
128kbps
MP3
Stereo
44100Hz
Audio-MP3-320Kbps
1020
MP3
320kbps
MP3
Stereo
44100Hz
2. TSC Audio Transcoding Template
MPS provides preset TSC Audio Transcoding Templates, which can be added directly to a scheme. You can also click Create template to customize your own TSC Audio Transcoding Templates.
Table of Detailed Configuration Item Description
Item
Description
Template Name
Support Chinese characters, letters, digits, underscores, hyphens, and dots, with a length of up to 64 chars.
Container Format
M4A
Audio Parameter Encoding Standard
AAC
Sample rate
Multiple sample rates such as 32000Hz, 44100Hz, and 48000Hz are supported.
Bitrate (Audio Bitrate)
The audio bitrate can be the same as that of the source file or be customized within the range of [26, 256] (in Kbps).
Sound Channel
Mono-channel, Dual-channel, Multichannel.
Templates created are displayed in the TSC Audio Transcoding Template list. You can view, edit, or delete custom templates, but preset templates can be viewed only, not edited or deleted.
System Preset TSC Audio Transcoding Template List
Template Name
Template ID
Container Format
Audio Bitrate
Codec
SoundSystem
Sample Rate
TESHD-Audio-M4A-192Kbps
100730
M4A
192kbps
AAC
Stereo
44100Hz
TESHD-Audio-M4A-256Kbps
100740
M4A
256kbps
AAC
Stereo
44100Hz
3. Audio Adaptive Bitrate Streaming Template
MPS provides preset Audio Adaptive Bitrate Streaming Templates, which can be added directly to a scheme. You can also click Create template to customize your own Audio Adaptive Bitrate Streaming Templates.
Item
Description
Template Name
Support Chinese characters, letters, digits, underscores, hyphens, and dots, with a length of up to 64 chars.
Template Description
The length cannot exceed 256 characters.
Packaging Format
HLS, MPEG-DASH.
Substream Information
Template
Substream parameters for General Audio Transcoding or TSCAudio Transcoding are selected.
Encoding standard
When the packaging format is HLS, the corresponding encoding standards are AAC and AC3.
When the packaging format is MPEG-DASH, the corresponding encoding standards are AAC, MP3, FLAC, and AC3.
Sample rate
Multiple sample rates such as 32000Hz, 44100Hz, and 48000Hz are supported.
Audio Bitrate
The audio bitrate can be the same as that of the source file or be customized within the range of [26, 256] (in Kbps).
Channel
Mono-channel, Dual-channel, Multichannel.
Templates created are displayed in the Audio Adaptive Bitrate Streaming Template list. You can view, edit, or delete custom templates, but preset templates can be viewed only, not edited or deleted.
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