have no idea what any of this means but after 24 hours of it being stuck I force quit it again and am going to see if the first DVD gets stuck like this one did.
This is the information given in the comments of the force quit section. There's a lot more than I'm posting but I can't seem to post all of it on the site.
Date/Time: 2017-08-09 10:36:59 -0400
OS Version: Mac OS X 10.12.6 (Build 16G29)
Architecture: x86_64h
Report Version: 25
Data Source: Stackshots
Command: iDVD
Path: /Applications/iDVD.app/Contents/MacOS/iDVD
Version: 7.1 (1145)
Build Version: 21
Project Name: iDVD
Source Version: 11450000
Parent: launchd [1]
PID: 2044
Event: hang
Duration: 1.10s (process was unresponsive for 61278 seconds before sampling)
Steps: 11 (100ms sampling interval)
Hardware model: iMac15,1
Active cpus: 4
Fan speed: 1195 rpm
--------------------------------------------------
Timeline format: stacks are sorted chronologically
Use -i and -heavy to re-report with count sorting
--------------------------------------------------
Heaviest stack for the main thread of the target process:
11 <truncated backtrace>
11 __psynch_cvwait + 10 (libsystem_kernel.dylib + 111374) [0xa17e330e]
*11 psynch_cvcontinue + 0 (pthread + 38973) [0xffffff7f8104d83d]
Process: iDVD [2044]
Path: /Applications/iDVD.app/Contents/MacOS/iDVD
Architecture: i386
Parent: launchd [1]
UID: 501
Task size: 79.14 MB (-8192 B)
CPU Time: 0.004
Note: Unresponsive for 61278 seconds before sampling
Note: 2 idle work queue threads omitted