Calling FFmpegKit cancel method 4 times kills the application

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Description
Calling FFmpegKit.cancel() 4 times, without any parameters kills the application.

Expected behavior
None of the API methods should cause the application to crash.

Current behavior
Application crashes.

To Reproduce
Call FFmpegKit.cancel() 4 times, without any method parameters.

Expected behavior
No crash.

Logs
No logs are printed to console.

Environment

• Platform: Android
• Architecture: arm-v7a, arm-v7a-neon, arm64-v8a, x86, x86_64
• Version: v4.4
• Android Studio version: 2020.3.1
• Android NDK version: r22b

Other
The issue was discovered on Android but it affects all platforms. Initial investigation show that the sigterm_handler method is responsible of that crash. The implementation coming from ffmpeg calls the exit method on the 4th call. See sigterm_handler method.

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Fixed in the development.