Closed Caption Tech Specs and Encoding Profiles

IMPORTANT NOTE FOR BROADCAST DELIVERABLES: Please note that the encoding service is intended for use cases like offline file sharing, kiosk video displays etc and not intended for broadcast deliverables. For broadcast deliverables, please download a closed caption file from your 3Play Media account and encode the captions outside of the account system using encoding software like HandbrakeApple Compressor, or Adobe Media Encoder.

 

Encoding Profiles and Technical Specs For Closed Captions

The table below details the technical specs for the different Encoding Profiles that will be available when you order from the account system.  Please be aware that these specs are targets; in some cases the quality of the input source video will limit how close to the target the encoding process can get.

NOTE: If you choose Source Settings, 3Play will encode the closed captions in an m4v file which has exactly the same specs as the original video that was uploaded for transcription/captioning or alignment services. So, in this case, you should be sure that the source video has the quality that you desire.

NOTE: Certain versions of Windows Media Player may not support Closed Captions. We recommend using either Quicktime or VLC Player to play these videos. Both are available on PC and Mac.

Click here for visual examples of the open caption encoding flavors

Device

Description

Target Width

Frame Rate

Overall Bit Rate

Audio Rate

H264 Video profile

Apple TV

Very high quality video optimized for Apple TV

1280

24

5 Mb/sec

160kb 48KHz

High

iPad

A profile for high quality playback on the iPad

1280

30

3 Mb/sec

160kb

48 KHz

Main

Android

A profile for high end Android devices

1280

30

2 Mb/sec

160kb

48 KHz

Baseline

iPhone5

Optimized for the latest iPhones

1136

30

3Mb/sec

160 kb

48 KHz

Main

iPhone4

Optimized for the most common iPhones

960

30

3 Mb/sec

160 kb

48 KHz

Main

Standard

Standard quality on most devices

640

30

1.5 Mb/sec

160 kb

48 Khz

Baseline

iPhone3

Trimmed down profile for legacy iOS devices

480

30

1 Mb/sec

128 kb

44.1 KHz

Baseline

iPod

A lower end profile good for iPods and cell phone networks

320

30

768 kb/sec

128 kb

44.1 KHz

Baseline

Source

Settings

Use this profile to leave your source video exactly as is

N/A

N/A

N/A

N/A

N/A

 

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