1. Watch some audio described movies in the same genre to get a feel for what good audio description is like. When you answer the other commenter's question about what movie it is, I'll suggest some movies you may wish to check out.

2. Watch the movie you're describing several times before doing so, making notes about what you'll describe and how you'll describe it.

3. Use CADET (https://www.wgbh.org/foundation/what-we-do/ncam/cadet) to write your audio description script.

4. There are several choices for recording it:

a. Record each line of audio description in a separate file. Then, in an editing program, insert each audio file at the correct point by using the timecodes generated when you wrote your script.

b. Record your entire script in one file. In an editing program, insert silence at the correct points so your lines of AD shift to the correct points.

c. Have the movie playing silently as you read the script, speaking at the correct timecodes.

Note that b. and c. require that you be more technically skilled as you'll be deleting parts of the recording when you made a mistake and inserting new, re-recorded lines in their place.

5. Whatever method you choose, listen to the final recording which should now contain both the movie and your AD. Play around with the audio levels so that both the AD and the soundtrack are clearly audible. At loud points in the movie, you may need to make small adjustments to the volume of the soundtrack.

Take an audiodescription course first. Audiodescription isn't a common description.

[deleted]