A 3GP subtitle job combines a small mobile picture with speech that may be narrowband, clipped, or recorded far from the subject. Cues should remain concise enough for the likely display while still preserving essential names and context.
Where this workflow fits
- Phone message subtitles
- Mobile interview captions
- Legacy handset accessibility
Write for a small mobile frame
Combine very short speech fragments when they belong to one natural phrase, but do not bridge a true speaker or scene change. Favor clean, compact lines that remain readable on a phone-sized player.
Handle narrowband uncertainty
Replay digits, addresses, and names with headphones and use surrounding conversation to resolve them. Mark genuinely inaudible speech rather than expanding a guess into a confident subtitle.
Before cue editing
- Retrieve the original mobile file and verify that its 3GP major brand matches the upload.
- Gather contact names, locations, and message context that can resolve narrowband ambiguity.
Limits worth knowing
- Telephony-oriented audio can make initials, numbers, and unfamiliar names difficult to distinguish.
- Abrupt handset pauses and camera cuts can create short fragments that should not each become a cue.
Questions from the workflow
Which 3GP copy is best for subtitles?
Use the original handset file when possible. Sending it through a messaging app can add compression or alter timing before subtitle work even begins.
Reviewed sources
- IANA Media Types registry · checked 2026-07-20
- RFC 3839: 3GPP media types · checked 2026-07-20