Burn subtititles to AVI/DivX on any mac with Toast8-10
You can use .srt, OR .idx / .sub. And mix them on same burned DVD. You do NOT need to merge 2CD files. (they will play sequentially with hardly noticeable delay.)
Open Toast to DATA mode. (NOT the intuitive VIDEO mode)
Select DVD-ROM (UDF) process. TOAST will now accept the sub files.
Make sure your .avi and sub files have EXACTLY the same name, EXCEPT for the EXTENSION (what follows the last period... i.e. .srt) If you have 2CD files, this would be a typical example of NAME list window for movie on hard drive>
name1.avi
name1.idx
name1.sub
name2.avi
name2.idx
name2.sub
Once you have these, they will play with VLC (free player for Windows and Mac) and you may select subtitles at bottom of VLC>VIDEO menu . PLAY - to be sure they are in sync. If not, look at your source, like LOL or XOR, or NoTv. Make sure they match. You may need a different sub. If still out of sync, you may need to use a sub file adjustment program (not for beginners)
OK Now drag the files from your HD to TOAST window. You shoud be able to get about 4 typical .avi movies on one DVD. The bottom bar GB numbers and green(enough room to burn) or red(not enough space) indicators will tell you.
Burn.
Enjoy.
Most DivX set top players will invoke/stop subs with a SUBTITLE button on remote. If your .srt file contains multiple languages, it will scroll through them.