How to reproduce:
1. Create a new project
2. In Unity select Assets > Import Package > Custom Package
3. Import the video.package attached to this project
Result: Editor crashes
Expected result: it should open editor and print an error if something is wrong with this video

Other reproduction steps:
1. Create a new project
2. Download arcore-unity-sdk-1.7.0.unitypackage from https://github.com/google-ar/arcore-unity-sdk/releases
3. In Unity select Assets > Import Package > Custom Package
4. Pick that package
Result: while importing Editor crashes

Part of crash log:
#0 0x0000010ae18c35 in ConvertJob::Perform(unsigned int)
#1 0x000001095f2220 in JobQueue::Exec(JobInfo*, long long, int)
#2 0x000001095f255e in JobQueue::Steal(JobGroup*, JobInfo*, long long, int, bool)
#3 0x000001095f3ad7 in JobQueue::WaitForJobGroupID(JobGroupID)
#4 0x000001095d9d41 in CompleteFenceInternal(JobFence&)
#5 0x0000010ae17be8 in AVFoundationVideoMedia::AddVideoFrame(ImageReference const&, Media::MediaTime const&)
#6 0x0000010ae17914 in AVFoundationVideoMedia::AddVideoFrame(ImageReference const&)
#7 0x00000108524893 in VideoClipTranscode::Import(core::basic_string<char, core::StringStorageDefault<char> > const&, core::basic_string<char, core::StringStorageDefault<char> > const&, VideoClipTranscode::TranscodeInfo const&, VideoClipTranscode::ClipInfo*, void (*)(float, float, core::basic_string<char, core::StringStorageDefault<char> > const&, bool), AssetImporter*)

Reproducible: 2019.2.0a7, 2019.1.0b6, 2019.1.0a10,
Not reproducible: 2019.1.0a9