How to read .SUB Files?

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I was trying to make a tool that reads and edits subtitles, I started by reading and editing .SRT files the most common and it was easy but when I cam to the next file type .SUB files which has the format of {Showtime}{Hidetime}Text(e.g {1234}1235}Hello) I was unable to find out what does the value of showtime or hide time mean I tried to figure out by watching the movie timing and ended up dividing it by 25 to get seconds, well it worked and I could also save it as .SRT and that file worked on the movie with perfect timing but when I tried that with another movie it didn't work as the constant this time was 22!
So now I'm really confused about it, is the number related to the movie record length or am I just misleading in how to read it?
Any help would be appreciated.
That's a piece from the code:

C#

string showtimeStr = blockStr.Substring(blockStr.IndexOf('{') + 1, blockStr.IndexOf('}') - 1);
showtime = TimeSpan.FromSeconds(Convert.ToDouble(showtimeStr.Trim()) / 25);

Posted 8-Jun-10 5:34am

Hesham_h4

Updated 8-Jun-10 5:55am

Johnny J.

v2

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OriginalGriff 9-Jun-10 3:42am

"Do you mean that this value presents the index of the frame that the sub will show/hide at?
If so then I think that I will need the video itself to read the file but a program like Jet Audio is able to preview the subtitle with time even without the record how come then" A very quick Google says that the numbers are definately fr4ame number references - which makes sense. You will either need the video file itself, or at a minimum the FPS the file was encoded at.

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OriginalGriff · Accepted Answer · 2010-06-08T06:31:00

Solution 1

Check against frame number - 25FPS is pretty normal.

Posted 8-Jun-10 6:31am

OriginalGriff

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Hesham_h4 8-Jun-10 19:24pm

Do you mean that this value presents the index of the frame that the sub will show/hide at?
If so then I think that I will need the video itself to read the file but a program like Jet Audio is able to preview the subtitle with time even without the record how come then!