In order that the Broadcaster can switch from one encoding into another, different profiles must be configured first.
Supported Video and Audio formats include:
- Video (decoding): MPEG2, H.264
- Video (encoding): H.264
- Audio (decoding): MPEG1 layers I/II/III (MP3), AAC
- Audio (encoding): AAC, AC3(pass-through)
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 - H.264 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 H.264 profile, 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 | |
Preset | Displays list of preset configured profiles. |
Name | Enter a unique name for the profile. |
Encoding Profile | For H.264: Default: Main For AAC: AAC Low Complexity / AAC High Complexity 1 / AAC High Complexity 2 Default: AAC Low Complexity |
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. |
Performance | the performance of the transcoding will span between Fastest and the Best Quality with Balance in the middle. |
| Advanced Options | |
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 |