Default Bitrates
If you leave out the AudioRepresentations or VideoRepresentations arrays from the Content Processing configuration section, we generate the default representations. This happens during the Encoding Phase.
Audio
For more information about audio representations, refer to this paragraph.
The default audio representations are as follows:
| Sound | AudioFormat | Bitrate (kbps) | Create |
|---|---|---|---|
| Stereo | AAC | 128 | Always |
| Mono | AAC | 64 | OnMatchingSound |
This means that:
- We always generate stereo output (given that the source audio has stereo sound or better).
- If mono sound is present in the source, we generate mono output as well (independent of if stereo output was generated). If a source audio track only has stereo sound or better, we do not generate a mono audio track for it because we do not upmix audio channels.
Video
The following bitrate ladder templates are available for requesting the default video representations:
- V2: The current default ladder that provides sane bitrates for up to 1080p for H.264 and up to 4K for H.265.
- V1: A deprecated ladder. We do not recommend using it unless for backward compatibility reasons.
You can specify the template be setting BitrateLadder in ContentProcessing to either of these versions. Please see the Content Processing page for the example.
Bitrate Ladder Versions
V2
This is the default bitrate ladder.
In the V2 ladder we only define one side of the video dimension and the other side will be calculated dynamically while maintaining the source video’s display aspect ratio.
H.264/AVC
| Width (px) | Height (px) | Bitrate (kbps) | Quality Group |
|---|---|---|---|
| Dynamic | 234 | 320 | SD |
| Dynamic | 360 | 860 | SD |
| Dynamic | 432 | 1130 | SD |
| Dynamic | 540 | 1590 | SD |
| Dynamic | 720 | 2450 | HD |
| Dynamic | 1080 | 4500 | HD |
H.265/HEVC
| Width (px) | Height (px) | Bitrate (kbps) | Quality Group |
|---|---|---|---|
| Dynamic | 360 | 320 | SD |
| Dynamic | 432 | 860 | SD |
| Dynamic | 540 | 1200 | SD |
| Dynamic | 720 | 1850 | HD |
| Dynamic | 1080 | 3400 | HD |
| Dynamic | 1440 | 5230 | UHD1 |
| Dynamic | 3840 | 9610 | UHD1 |
V1
The V1 bitrate ladder is available only for backward compatibility. We recommend using either V2 or (preferably) V2-VeryHigh.
H.264/AVC and H.265/HEVC
16:9 Aspect Ratio
| Width (px) | Height (px) | Bitrate (kbps) | Quality Group |
|---|---|---|---|
| 384 | 216 | 300 | SD |
| 512 | 288 | 400 | SD |
| 640 | 360 | 800 | SD |
| 1024 | 576 | 1200 | SD |
| 1280 | 720 | 2100 | HD |
| 1920 | 1080 | 3000 | HD |
| 2560 | 1440 | 4500 | UHD1 |
| 3840 | 2160 | 6000 | UHD1 |
4:3 Aspect Ratio
| Width (px) | Height (px) | Bitrate (kbps) | Quality Group |
|---|---|---|---|
| 640 | 480 | 1100 | SD |
| 1024 | 768 | 2400 | HD |
| 1600 | 1400 | 4200 | UHD1 |
| 2048 | 1536 | 4500 | UHD1 |
| 2732 | 2048 | 7000 | UHD1 |