Before we dive in, let’s review how caption encoding technology works. Most encoders function similarly:
1: The caption provider transmits their caption data to the encoder.
2: The encoder collects the caption feed for transmission to the viewer.
3: The encoder pairs the captions to the video on a specific data transmission line, known as line 21– this is the data that televisions are mandated to decode captions from.
With 3Play Media, you’ll upload your video file for captioning and transcription processing. If you already have a transcript, you can use the automated transcript alignment service. Once your file has been captioned, you can order the caption encoding service and choose the appropriate encoding profile. Upon completion, you will receive an email notification and be able to download an M4V video with encoded captions.
The video will work with any player or device that supports M4V videos, including QuickTime, iPad, iPhone, iPod, iTunes, JW Player, and Flowplayer. Because the captions are soft-encoded in the video, users will be able to turn them on or off using the video player controls.