In order for the Broadcaster to switch from one encoding to another, different profiles must be configured first.
Supported Video and Audio formats include:
- Video Decoding – MPEG2, H.264/AVC , H.265/HEVC
- Video Encoding – MPEG2, H.264/AVC , H.265/HEVC
- Audio Decoding – AAC, MPEG-1 Audio Layer I / II / III, MPEG-2 Audio Layer I / II / III
- Audio Encoding – AAC only, AAC only; Pass through – any audio codec (MPEG1/2 / AAC / AC-3)
AC3 is supported as pass-through (no decoding and no encoding)
The transcoder comes with the following pre-set common video profiles:
1080i60 / 1080i59.94, 1080p30 / 1080p25, 720p60, 720p50 / 720p30, 576i60 / 576p25, 480i60 / 480p29.97
However you can define your own custom profiles.
To Create a New Profile:
- In the Transcoder page, click
. The Add New Profile window is displayed:
- Select the desired Profile type - MPEG2, H.264, H.265 for video profile and AAC for audio profile.
- Enter in the desired fields in the Profile configuration (see table below for additional parameters).
Selecting a specific configured Preset will fill in the settings automatically or alternatively leaving the default as Custom requires you to configure it by yourself. - If you want to configure the Advanced options for the video profiles, select Advanced options and fill out the respective fields (see table below for additional parameters).
- Click Apply.
The newly configured profile is created and appears on the screen.
| Parameter | Description |
|---|---|
| Profile configuration | For Video - MPEG2, H.264, H.265 |
Preset | Displays list of preset configured profiles. |
Name | Enter a unique name for the profile. |
| Hardware Acceleration | Select this checkbox to utilize hardware-based acceleration when available. |
Encoding Profile | For video profiles (MPEG2, H.264, H.265): Default: Main |
Resolution
| The new resolution, if resizing the video. |
Frames per Second | Select a new frame rate, or select Original to use the original frame rate of the stream. Default: Original |
Bitrate Mode | Specifies the bitrate mode for the profile. Either the transcoder will strive for the optimum in VBR (Variable Bitrate) or the most constant in CBR (Constant Bitrate). |
Average Bitrate (kbps) | Specifies the average bitrate for the profile. |
Max Bitrate (kbps) | Specifies the maximum bitrate for the profile. Available only if the Bitrate Mode is set to VBR. |
Performance | the performance of the transcoding will span between Fastest and the Best Quality with Balance in the middle. |
| Advanced Options | |
| Copy GOP from source | |
GOP [frames] | Specifies the number of frames in a GOP (Group of Pictures). Default:60 |
| Default settings: Closed, Fixed | |
B-Frames | Specifies the maximal number of consecutive B frames in the GOP. Default:0 |
Frame Type | Specifies the frame type – progressive or interlaced. Default: Progressive |
Reference Frames | Specifies the number of frames that can be referenced for each frame. Default: 2 |
| HRD buffer length (seconds) | Specifies the length of the HRD buffer in MPEG-2. |
| Profile configuration | For Audio - AAC |
| Name | Enter a unique name for the profile. |
Bitrate | Specifies the bitrate for the profile |
| Encoding Profile | For audio profile (AAC): AAC Low Complexity / AAC High Complexity 1 / AAC High Complexity 2 Default: AAC Low Complexity |