IMO you are safer compiling from source than you are using old packages from old repositories.
Best advice I can give you is to file a bug report with blackmagic, they need to update their dependencies.
To compile, go to the relevant ubuntu package to identify the package and upstream source
So you want "libpng_1.2.54.orig.tar.xz"
download, extract, compile, install (starting after download and extracting the tar ball).
sudo make install
To remove again (if needed)
#run within libpng-1.2.54 directory
sudo make uninstall
I understand it seems like a few extra steps, but it is trivial to download and compile in this way and there is no risk of breaking apt.