/subtitle-correction

SRT Format Reference

File Structure

An SRT (SubRip Subtitle) file consists of sequential subtitle entries, each containing:

1
00:00:01,500 --> 00:00:04,500
First line of subtitle text
Optional second line

2
00:00:04,700 --> 00:00:07,666
Next subtitle text

Entry Components

1. Sequence Number

• Sequential integer starting from 1
• Must be preserved exactly
• No gaps or duplicates allowed

2. Timestamp Line

HH:MM:SS,mmm --> HH:MM:SS,mmm

• Start time --> End time
• Hours:Minutes:Seconds,Milliseconds
• Uses comma (,) as decimal separator, NOT period
• Must be preserved exactly - NEVER modify

3. Text Content

• One or more lines of text
• This is the ONLY part to correct
• Empty line separates entries

Critical Rules for Subtitle Correction

DO

• Correct spelling and terminology errors in text lines
• Maintain all line breaks within subtitle text
• Preserve empty lines between entries
• Keep sequence numbers unchanged
• Keep timestamps unchanged

DON'T

• Modify timestamp values
• Change sequence numbers
• Merge multiple entries
• Split single entries
• Add or remove entries
• Change the comma in timestamps to period

Example Correction

Before (with errors):

53
00:02:23,433 --> 00:02:25,833
定义了一款工具summers conversation

54
00:02:26,133 --> 00:02:28,166
这款工具除了用了Lantern

After (corrected):

53
00:02:23,433 --> 00:02:25,833
定义了一款工具summarize_conversation

54
00:02:26,133 --> 00:02:28,166
这款工具除了用了LangChain

Processing Large Files

For files with many entries:

1. Read in chunks using line ranges
2. Track position to ensure complete coverage
3. Verify entry count matches after correction
4. Check continuity - no missing sequence numbers

Validation Checklist

Before outputting corrected file:

• Entry count matches original
• All sequence numbers present (1 to N)
• All timestamps unchanged
• No malformed timestamp lines
• Empty line between each entry
• No trailing whitespace issues