How to Convert a Video Transcript into an SRT Subtitle File
You have a transcript - plain text of what was said in your video. Now you need it as an SRT file with timestamps so it can be uploaded to YouTube, embedded in a video player, or burned into the video itself. Converting from transcript to SRT requires adding timing, breaking text into readable segments, and formatting to the SRT specification.
Key takeaways
- SRT files require sequential numbering, timestamps in HH:MM:SS,mmm format, and text per cue.
- Each subtitle cue should contain 1-2 lines, not full sentences or paragraphs.
- Break lines at natural phrase boundaries - not mid-word or mid-thought.
- Automatic timing from the video audio skips most manual timestamping; CapsAI's editor uses it for burned-in captions rather than SRT downloads.
Understanding SRT format
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.
Breaking a transcript into subtitle segments
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.
- Maximum 42 characters per line
- Maximum 2 lines per subtitle cue
- Break at sentence or clause boundaries
- Never split compound words or names across cues
- Each cue should be readable in 1.5-4 seconds
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Put Accurate Captions Into Practice
Create editable subtitles with CapsAI, then review Indian names, brands and places using the workflow in this guide.
Adding timestamps manually vs automatically
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, so its editor shows timed captions without a manual timing step - but it exports them burned into an MP4, not as an SRT file. If you need an SRT from a plain transcript, CapsAI's TXT to SRT tool creates a basic draft with a fixed duration per cue, which you then adjust against the video.
Common SRT formatting mistakes
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.
The faster approach: generate SRT directly from video
If you have the original video and your goal is on-screen captions, skip the transcript-to-SRT conversion entirely. Upload the video to CapsAI, select your language, review the timed captions it generates, and export an MP4 with burned-in captions. CapsAI's editor does not download an SRT file, so for a sidecar caption file use a tool that exports SRT from video, or build a draft from your reviewed text.
Either way, automatic timing still needs a review pass, but it is far quicker than manually timestamping a plain transcript, which takes humans many passes to get right.
Frequently asked questions
Can I convert a transcript to SRT without the original video?
You can create the SRT structure (numbering, text segments) but you cannot add accurate timestamps without the video or audio. Timestamps require knowing exactly when each phrase is spoken.
What encoding should I use for Hindi SRT files?
Always UTF-8. Devanagari characters require Unicode support. Save as 'UTF-8 without BOM' in most text editors. ANSI or Latin encoding will corrupt Hindi text.
How many subtitle cues should a 5-minute video have?
Roughly 50-80 cues for conversational speech. That averages to one cue every 3-5 seconds. Fast speech produces more cues; slow speech with pauses produces fewer.
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