Debug

Debug procedure:

Universal method:

#get real root privileges, not sudo
su -
#backup original setup of core files.
sysctl -n kernel.core_pattern > oldvalue
#setup core files to be produced in the curent dir.
echo "core.%e.%p" > /proc/sys/kernel/core_pattern
exit

#open other terminal or start QtVsPlayer from menu/desktop.
QtVsPlayer

#return in the first terminal 
ps aux |grep -i qtvsp
#surfzoid      1015906  0.0  0.0  45432  1540 pts/1    D    06:35   0:00 QtVsPlayer
#produce a core file
gcore 1015906

#quit QtVsPlayer
#create the backtrace of the bug and/or the crash
gdb /usr/bin/QtVsPlayer -c ./core.1015906
run
#reproduce the bug/crash
bt
thread apply all bt full
quit

#upload the core.1015906 file, for example at https://wetransfer.com/ and provide the link in your bug report

#clean and restore
rm -f ./core.1015906
su -
cat ./oldvalue > /proc/sys/kernel/core_pattern
rm -f ./oldvalue