Error opening mp4 file

I tried to open an mp4 file in Fiji (using ffmpeg plugin). It works fine when ‘Use virtual stack’ option is disabled. But when I enable that option, I get the following:

— start of error message —
(Fiji Is Just) ImageJ 2.0.0-rc-69/1.52t21; Java 1.8.0_172 [64-bit]; Linux 5.3.0-24-generic; 1733MB of 17321MB (10%)

java.lang.NullPointerException
at ij.VirtualStack.(VirtualStack.java:41)
at fiji.ffmpeg.IO$2.(IO.java:144)
at fiji.ffmpeg.IO.readMovie(IO.java:144)
at fiji.ffmpeg.Importer.run(Importer.java:45)
at ij.IJ.runUserPlugIn(IJ.java:233)
at ij.IJ.runPlugIn(IJ.java:196)
at ij.Executer.runCommand(Executer.java:150)
at ij.Executer.run(Executer.java:68)
at java.lang.Thread.run(Thread.java:748)
– end of error message —

I don’t think I ran our of memory (see below).
How to fix this?

Info about my PC:
Kernel: Linux user01-pc 5.3.0-24-generic #26-Ubuntu SMP Thu Nov 14 01:33:18 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Memory: using 4231088 of a total of 24507472 (as reported by ‘free’ command)

Short hardware info:

H/W path Device Class Description

                 system         Computer                                                                                                                                                                                                 

/0 bus Motherboard
/0/0 memory 24GiB System memory
/0/1 processor Intel® Core™ i7-6700 CPU @ 3.40GHz
/0/100 bridge Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Host Bridge/DRAM Registers
/0/100/2 display HD Graphics 530
/0/100/14 bus 100 Series/C230 Series Chipset Family USB 3.0 xHCI Controller
/0/100/14.2 generic 100 Series/C230 Series Chipset Family Thermal Subsystem
/0/100/16 communication 100 Series/C230 Series Chipset Family MEI Controller #1
/0/100/17 storage Q170/Q150/B150/H170/H110/Z170/CM236 Chipset SATA Controller [AHCI Mode]
/0/100/1c bridge 100 Series/C230 Series Chipset Family PCI Express Root Port #5
/0/100/1c/0 enp1s0 network RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
/0/100/1d bridge 100 Series/C230 Series Chipset Family PCI Express Root Port #9
/0/100/1f bridge H110 Chipset LPC/eSPI Controller
/0/100/1f.2 memory Memory controller
/0/100/1f.3 multimedia 100 Series/C230 Series Chipset Family HD Audio Controller
/0/100/1f.4 bus 100 Series/C230 Series Chipset Family SMBus
/0/2 system PnP device PNP0c02
/0/3 system PnP device PNP0c02
/0/4 system PnP device PNP0c02
/0/5 system PnP device PNP0b00
/0/6 generic PnP device INT3f0d
/0/7 system PnP device PNP0c02
/0/8 system PnP device PNP0c02
/0/9 system PnP device PNP0c02

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