Is there an existing issue for this?

• I have searched the existing issues

Bug description

When in the [track refinement GUI] you attempt to fast-forward the speed you are met with DeepLabCut crashing and the following error in the terminal:

QCoreApplication::exec: The event loop is already running
QObject::startTimer: Timers can only be used with threads started with QThread
.....
QObject::startTimer: Timers can only be used with threads started with QThread
Assertion fctx->async_lock failed at libavcodec/pthread_frame.c:173

I mentioned this to Konrad Danielewski, who I beleive commented on it in a different pull-request: Here

Operating System

Windows 11

DeepLabCut version

v2.3.0

DeepLabCut mode

multi animal

Device type

RTX4080
i5-12600K

Steps To Reproduce

1. Open DLC's [Track Refinment GUI]
2. Attempt to speed-up the frames/tick by using [Alt]-[Forward]
3. Crash

Relevant log output

QCoreApplication::exec: The event loop is already running
QObject::startTimer: Timers can only be used with threads started with QThread
QObject::startTimer: Timers can only be used with threads started with QThread
QObject::startTimer: Timers can only be used with threads started with QThread
QObject::startTimer: Timers can only be used with threads started with QThread
QObject::startTimer: Timers can only be used with threads started with QThread
QObject::startTimer: Timers can only be used with threads started with QThread
QObject::startTimer: Timers can only be used with threads started with QThread
QObject::startTimer: Timers can only be used with threads started with QThread
QObject::startTimer: Timers can only be used with threads started with QThread
QObject::startTimer: Timers can only be used with threads started with QThread
Assertion fctx->async_lock failed at libavcodec/pthread_frame.c:173

Anything else?

The lack of this features makes the fixing of occasional identity swaps in a highly interacting species over hours of video very difficult if not impossible given the sluggishness of the GUI in general.

Thank you for any help in this matter

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