Convert PGS Subtitles to LRC Format
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About PGS
PGS (Presentation Graphic Stream) is an image-based subtitle format used exclusively for Blu-ray discs. Unlike text-based formats like SRT, PGS subtitles are stored as a sequence of bitmap images that are overlaid on the video. This means they can have any font, style, or color imaginable, but it also means they are not text-searchable and cannot be easily edited.
About LRC
LRC is a format designed to display synchronized lyrics for audio files, most commonly used by music players and karaoke software. The format is a simple text file with a timestamp at the beginning of each line of lyrics. As the audio plays, the player displays the line of text that corresponds to the current time, creating a simple but effective karaoke-style experience.
PGS vs LRC
| Feature | PGS | LRC |
|---|---|---|
| Styling Support | true | false |
| Positioning Support | true | false |
| Animation Support | false | false |
| Learning Curve | expert | beginner |
| Quality Rating | 5 | 3 |
| Patent Status | proprietary | open format |
| Year Introduced | 2006 | 1999 |
Frequently Asked Questions
Can I edit a PGS subtitle file?
No, you cannot edit the text in a PGS file directly because it's a series of images, not text. To 'edit' a PGS file, you would need to use Optical Character Recognition (OCR) software to convert the images back into a text-based format like SRT, edit the text, and then optionally convert it back, though this is a complex and often error-prone process.
Why do Blu-rays use image-based subtitles?
Image-based subtitles guarantee that the text will be displayed exactly as the designer intended, with specific fonts and styles, on any certified Blu-ray player. This avoids issues with players not having the correct fonts installed or not supporting certain text rendering features.
Can I use LRC files for video subtitles?
LRC is not suitable for video subtitles. It only has a start timestamp for each line and no end time, meaning the text would remain on screen until the next line appears. It's specifically designed for the line-by-line nature of song lyrics and lacks the features needed for proper dialogue subtitling.
What is the difference between simple and enhanced LRC?
Simple LRC format provides a timestamp for each line. Enhanced LRC format adds the ability to have timestamps for each word within a line, allowing for a more precise word-by-word highlighting effect in karaoke applications.
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