Me too.
Pause
No sound
quit (Hangs)
Force quit.
start again and it's OK.
EDIT:
A few mins later it crashed entirely:
Blank screen. Buzzing sound. Black screen.
Mac rebooted - the first time thatn has EVER happened.
Rebooted OK.
Restarted VLC and other apps.
ran OK...
Movie was The.Founder.2016.DVDScr.XVID.AC3.HQ.Hive-CM8.avi with subtitles: The.Founder.2016.WEB-DL.XviD.MP3-FGT.srt
Crash was at VLC -1:18:55 or so.
===
Hardware Overview:
Model Name: iMac
Model Identifier: iMac18,3
Processor Name: Quad-Core Intel Core i5
Processor Speed: 3.4 GHz
Number of Processors: 1
Total Number of Cores: 4
L2 Cache (per Core): 256 KB
L3 Cache: 6 MB
Memory: 16 GB
Boot ROM Version: 181.0.0.0.0
SMC Version (system): 2.41f2
Serial Number (system): C02TL8M0J1GG
Hardware UUID: 877807B4-B7A1-58C8-B3AB-62AA75DA2795
===
System Software Overview:
System Version: macOS 10.15.4 (19E287)
Kernel Version: Darwin 19.4.0
Boot Volume: Macintosh HD
Boot Mode: Normal
Computer Name: IMAC’s iMac
Username: IMAC 27 (imac27)
Secure Virtual Memory: Enabled
System Integrity Protection: Enabled
Time since boot: 7 days 10:07