Different srt timings?

[johnggg]

Someone please save me from going crazy! I've created subtitle files (srt) from a ntsc DVD using both dvdsubedit and subrip but they give me different timings:

dvdsubedit:

1
00:01:49,133 --> 00:01:50,259
Is anybody home?

2
00:01:53,633 --> 00:01:54,429
Hello!

3
00:01:56,166 --> 00:01:57,360
Who are you?

4
00:02:08,199 --> 00:02:09,258
I'm Rick!

5
00:02:13,533 --> 00:02:14,659
Do I know you?

But subrip gives me:

1
00:01:49,476 --> 00:01:50,602
Is anybody home?

2
00:01:53,980 --> 00:01:54,776
Hello!

3
00:01:56,516 --> 00:01:57,710
Who are you?

4
00:02:08,561 --> 00:02:09,619
I'm Rick!

5
00:02:13,900 --> 00:02:15,026
Do I know you?

Which program is giving me the correct timings? For what it is worth, vsrip gives me even different timings:

timestamp: 00:01:49:175, filepos: 000000000
timestamp: 00:01:53:680, filepos: 000000800
timestamp: 00:01:56:216, filepos: 000001000
timestamp: 00:02:08:261, filepos: 000001800
timestamp: 00:02:13:600, filepos: 000002000

[setarip_old]

Hi!

Not an explanation for "Why?" but, it appears to be either the difference between 24fps and 23.978fps or 29.970fps and 30fps...