Problems shifting by more than an hour?

[intuited]

I was trying to use srt-shift to split a subtitle file into two parts, so that I can use it with a

I copied the subtitles for the second part into a new file and reindexed them (changed the number of the first line of each subtitle).

The second part starts at about 1:02:58.

I tried running srt-shift Incendies\ 2010.DVDrip.captions.cd2.srt -3778 on the newly created file. However, it outputs subtitles like these:

634
02:-59.4833333333:31.0,709 --> 02:-59.4333333333:34.0,337
Rien n'est plus beau
que d'être ensemble.

635
02:-59.4:36.0,214 --> 02:-59.3833333333:37.0,704
Je vous aime.

I didn't try playing them, but I wouldn't expect them to work reliably with most media players.

[intuited]

The original subtitle file is available here.