Axinom Encoding Service tries to produce all the predefined bitrates if you don't provide the output bitrates manually. Look at the list of predefined bitrates, based on the source video quality and the codec used

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:

  1. We always generate stereo output (given that the source audio has stereo sound or better).

  2. 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:

  1. V2: The current default ladder that provides sane bitrates for up to 1080p for H.264 and up to 4K for H.265.

  2. 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

Revision History

The table below lists the document versions and any changes to them.

Version Date Description

1.0

October 20, 2020

  • Initial version.

2.0

July 3, 2023

Added default audio representations.

2.1

July 27, 2023

Added video bitrate ladder versions