How to Convert a Video Transcript into an SRT Subtitle File

An SRT file is a plain text file with a specific structure. Each subtitle cue has three parts: a sequential number (1, 2, 3...), a timestamp line showing start and end times separated by ' --> ', and one or two lines of text. Cues are separated by blank lines. The timestamp format is HH:MM:SS,mmm (hours, minutes, seconds, milliseconds - note the comma, not a period).

A valid SRT cue looks like: 1 (newline) 00:00:01,000 --> 00:00:03,500 (newline) This is the first subtitle. The simplicity of the format is its strength - any text editor can create or modify SRT files.

A transcript is continuous text. Subtitles are short segments displayed briefly. You need to split the transcript into chunks of 1-2 lines, each short enough to read in 2-4 seconds. Aim for 42 characters per line maximum (the standard for most video players) and no more than 2 lines per cue.

Break at natural pause points: sentence ends, clause boundaries, or commas. Never split a word across two cues. Never split a proper noun from its title or context. 'Prime Minister' should not have 'Prime' on one cue and 'Minister' on the next.

Manual timestamping means watching the video and noting when each phrase starts and ends. For a 5-minute video, this takes 15-25 minutes. You play, pause, note the time, assign it to the next cue, and repeat. It is accurate but tedious.

Automatic timestamping uses AI to detect speech boundaries and assign times. CapsAI does this during transcription - you get an SRT file directly without the manual timing step. If you already have a plain transcript without timing, uploading the original video and transcribing again produces a timed SRT faster than manual timestamping.

Wrong timestamp separator: SRT uses a comma (00:00:01,000), not a period. Using a period creates a file that some players reject. Missing blank lines between cues: every cue must be followed by an empty line. Without it, players merge cues or display incorrectly. Wrong encoding: SRT files should be UTF-8, especially for Hindi, Tamil, or Telugu content. ANSI encoding corrupts non-Latin characters.

Non-sequential numbering: if you delete a cue, renumber all subsequent cues. Some players tolerate gaps but others break. Overlapping timestamps: cue 2 must not start before cue 1 ends. Overlaps cause display glitches on most players.

If you have the original video, skip the transcript-to-SRT conversion entirely. Upload the video to CapsAI, select your language, and get a properly formatted SRT file with accurate timestamps. The AI handles segmentation, timing, and formatting automatically.

This is faster and more accurate than manually timestamping a plain transcript. The AI aligns text to speech at the millisecond level - something that takes humans many passes to achieve.