Encoding Profile Settings
This document is a machine-translated draft and is currently undergoing review. Some content may be inaccurate or differ from the original Korean version. For the most precise information, refer to the Korean documentation.
What is an Encoding profile?
An Encoding Profile is a collection of settings used for transcoding operations. Original files uploaded to Kollus VOD are automatically converted into formats optimized for various viewing environments according to the resolution, bitrate, audio settings, and other parameters defined in the encoding profile.
Why is transcoding necessary?
To play a single video file seamlessly across various devices (PC, mobile, tablet, etc.) and network conditions, multiple quality versions optimized for each environment must be generated. This process is called Transcoding, which involves decoding the original file and then re-encoding it with settings appropriate for the viewing environment.
With proper profile configuration, you can establish a variable bitrate streaming environment where video quality automatically adjusts based on network speed, minimizing buffering.
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The list of encoding profiles can be viewed in the Kollus VOD console > [Settings] > [Encoding profile] menu.
Kollus VOD provides the following default encoding profiles.
- PC (16:9, High)
- TABLET (4:3, High)
- MOBILE (16:9, Normal)
Each encoding profile consists of the following items.
| Item | Description |
|---|---|
| Profile group (①) | The group name classified based on the type of playback device and aspect ratio. |
| Profile name (②) | An automatically generated name combining the playback device, aspect ratio, and quality information. |
| Profile key (③) | The unique identifier for the profile. Used as a reference value when performing FTP passthrough uploads or linking to categories. |
Profile group classification
| Group name | Device and aspect ratio |
|---|---|
| TV | - |
| PC1 | PC 16:9 |
| PC2 | PC 4:3 |
| PC3 | PC 21:9 |
| TABLET1 | TABLET 16:9 |
| TABLET2 | TABLET 4:3 |
| TABLET3 | TABLET 16:10 |
| MOBILE1 | MOBILE 16:9 |
| MOBILE2 | MOBILE 4:3 |
| Audio | - |
Default Encoding profile specifications
| Item | PC | TABLET | MOBILE |
|---|---|---|---|
| Video codec | H.264 / MPEG-4 AVC | H.264 / MPEG-4 AVC | H.264 / MPEG-4 AVC |
| Profile level | Main@L3.0 | Main@L3.0 | Main@L3.0 |
| Container format | MP4 | MP4 | MP4 |
| Video bitrate | 1500 Kbps | 800 Kbps | 600 Kbps |
| Video frame rate | 30 fps | 30 fps | 30 fps |
| Resolution | 960×540 / 16:9 | 720×540 / 4:3 | 480×270 / 16:9 |
| Audio codec | AAC, 2Ch | AAC, 2Ch | AAC, 2Ch |
| Audio bitrate | 128 Kbps | 128 Kbps | 64 Kbps |
| Audio sample rate | 48000 Hz | 48000 Hz | 48000 Hz |
Add a new Encoding profile
If you need a special resolution or high-quality bitrate beyond the default encoding profiles, you can add a new profile.
The added encoding profile is applied to content newly uploaded after the configuration is complete. (not applied retroactively to existing content)
- Go to Kollus VOD console > [Settings] > [Encoding profile] menu.
- Click [Add profile] in the upper right corner.
- Click [Add (+)] to the right of the desired profile item.
Item Description Ratio The aspect ratio of the playback device's screen. Quality Divided into 4 levels based on resolution and bitrate. - HD (Very good)
- High (Good)
- Normal (Average)
- Low (Poor)
Resolution The horizontal × vertical pixel dimensions of the video. Bitrate The amount of data processed per second. Higher bitrate improves video quality but increases network bandwidth and storage usage. Profile information
(detailed attributes)Includes the following items. - Codec
- Profile
- Container format
- Bitrate mode
- Bitrate (Kbps)
- Frame rate (fps)
- Resolution
- Audio codec
- Audio bitrate (Kbps)
- Audio sample rate (Hz)
- Transcoding to the corresponding profile will be automatically performed for newly uploaded videos.
Supported Encoding profile list
Video
| Device | Ratio | Quality | Resolution | Video bitrate |
|---|---|---|---|---|
| TV | 16:9 | HD | 1920×1080 | 6 Mbps |
| TV | 16:9 | High | 1280×720 | 2.7 Mbps |
| TV | 16:9 | Normal | 960×540 | 1.2 Mbps |
| PC | 16:9 | HD | 1280×720 | 2 Mbps |
| PC | 16:9 | High | 960×540 | 1.5 Mbps |
| PC | 16:9 | Normal | 640×360 | 800 Kbps |
| PC | 4:3 | HD | 1280×960 | 2 Mbps |
| PC | 4:3 | High | 960×720 | 1.5 Mbps |
| PC | 4:3 | Normal | 640×480 | 800 Kbps |
| TABLET | 16:9 | HD | 960×540 | 1.5 Mbps |
| TABLET | 16:9 | High | 640×360 | 800 Kbps |
| TABLET | 16:9 | Normal | 428×240 | 600 Kbps |
| TABLET | 16:10 | HD | 1152×720 | 1.5 Mbps |
| TABLET | 16:10 | High | 864×540 | 800 Kbps |
| TABLET | 16:10 | Normal | 576×360 | 600 Kbps |
| TABLET | 4:3 | HD | 960×720 | 1.5 Mbps |
| TABLET | 4:3 | High | 720×540 | 800 Kbps |
| TABLET | 4:3 | Normal | 480×360 | 600 Kbps |
| MOBILE | 4:3 | HD | 720×540 | 1 Mbps |
| MOBILE | 4:3 | Normal | 480×360 | 600 Kbps |
| MOBILE | 4:3 | Low | 240×180 | 300 Kbps |
| MOBILE | 16:9 | HD | 960×540 | 1 Mbps |
| MOBILE | 16:9 | Normal | 480×270 | 600 Kbps |
| MOBILE | 16:9 | Low | 240×136 | 300 Kbps |
Audio
| Codec | Quality | Audio bitrate | Audio sample rate |
|---|---|---|---|
| MP3 | Normal | 192 Kbps | 44.1 kHz |
Edit an Encoding profile
- Edit permission: Only accounts with a user role of administrator or super administrator can edit encoding profiles.
- Non-editable items: The profile key cannot be changed as it is a unique identifier.
Changes will not be applied retroactively to existing content for which transcoding was already completed before the settings were modified. For stable operation, it is recommended to add a new profile rather than modifying an existing one.
Encoding profile editing procedure
- Go to Kollus VOD console > [Settings] > [Encoding profile] menu.
- Click the edit icon to the right of the profile you want to edit.
- Modify the detailed settings. (Refer to the Recommended Settings for Video Content section)
Item Description Profile name The name used to identify the profile. (Maximum 50 characters including spaces, emojis not allowed) File format The container format of the content to be used for the service. You can choose MP4 for video or MP3 for audio. Bitrate mode The processing method for the amount of data transferred per second (bitrate). - Constant bitrate(CBR): Encodes at a fixed bitrate to maintain consistent quality.
- Variable bitrate(VBR): Adjusts the bitrate according to the complexity of the video to improve efficiency.
Video Codec The video compression format. - H.264/MPEG-4 AVC: The most universally compatible standard codec
- MPEG-4 Video(MP4V): A video codec of older specifications
Profile Defines the compression level and technical specifications of the video codec. - When codec H.264/MPEG-4 AVC is selected
- Baseline@L1.3 Mobile
- Baseline@L3.0
- Main@L3.0
- High@L3.0
- High@L4.1
- High@L5.1
- When codec MPEG-4 Video(MP4V) is selected
- No options available
Bitrate(Kbps) The amount of data processed per second. (0–100,000 Kbps) Frame rate(fps) The number of frames displayed per second. (10–60 fps) Video size After selecting the aspect ratio, enter the width value and the height value will be automatically calculated. (Custom settings available) Audio Audio codec The audio compression format. AAC provides better sound quality and compression efficiency than MP3, but some devices may not support AAC. - AAC: A standard codec that provides superior sound quality and higher compression efficiency compared to MP3.
- MP3: A codec with high compatibility but relatively lower compression efficiency.
Bitrate(Kbps) The amount of data processed per second. (48–320 Kbps) Sample rate(Hz) The number of samples per second used to convert an analog audio signal to a digital signal. (11025, 22050, 44100, 48000 Hz) Use additional profile Enabling this option allows you to link the profile to a specific category for automatic transcoding, or perform additional transcoding for individual content.
⚠️ Additional transcoding is only available for content with saved original files. The original file saving setting must be enabled in Kollus VOD console > [Settings] > [Save original files] menu, and it applies only to files uploaded after activation.- How to link to a category: Category-Profile Auto Linking
- How to perform additional transcoding: Additional Transcoding Guide
Recommended settings for video content
These are the optimal recommended values considering the general internet streaming environment for customers.
| Item | Recommended value |
|---|---|
| File format | MP4 |
| Codec | H.264/MPEG-4 AVC |
| Profile | Main@L3.0 |
| Bitrate | PC: 1,500~2,500 Kbps / MOBILE: 1,000~1,500 Kbps |
| Frame rate | 30 fps |
| Video size | PC: 1280×720~1920×1080 / MOBILE: 960×540~1280×720 |
| Audio codec | AAC |
Category-profile auto linking
You can automatically apply a pre-designated encoding profile to content uploaded to a specific category.
Category linking procedure
- Refer to the Editing an Encoding Profile section and enable the [Use additional profile] option for the target profile.
- Click [Add (+)] that appears below the profile item.
- Select the category to which you want automatic application, then click [Save].
- After configuration, all videos uploaded to that category will be automatically converted using both the default profile and the linked additional profile.
Disable an Encoding profile
You can optimize system resources and improve management efficiency by disabling profiles that are not in use.
- Minimum maintenance condition: At least one profile must always remain active for the system's normal upload and conversion processes.
- Control method: You can immediately control the active status of each profile using the toggle switch in the Kollus VOD console > [Settings] > [Encoding profile] menu.
Encoding profile active state
Encoding profile inactive state