This isn't exactly a bug, so I didn't want to send a report of one, but I 
encountered a 404 Not Found when trying to download some libav tools, that I 
was hoping I could get a pointer with!  Apologies for the newbie question... 
I'm not adept with running command lines in my terminal window, but I use the 
DownloadHelper add-on in Firefox that required getting libav to convert certain 
video formats.  As I have a Mac (OS 10.12), their suggestion was to paste the 
following line in my terminal window in Homebrew:  brew install libav 
--with-fdk-aac --with-ffplay --with-freetype --with-libass --with-libquvi 
--with-libvorbis --with-libvpx --with-opus --with-x265
I did that, and got various errors about tools not being installed and files 
not being writeable.  Found what commands to type to fix it thanks to Google, 
tried again, and it said it was installing all the necessary libav tools (x264, 
xvid, libpng, freetype, fdk-).  All of them installing up to when it got to 
libpng, at which point got:
==> Installing libav dependency: libpng
==> Downloading https://downloads.sf.net/project/libpng/libpng16/1.6.16/libpng-1

curl: (22) The requested URL returned error: 404 Not Found
Error: Failed to download resource "libpng"
Download failed: 
https://downloads.sf.net/project/libpng/libpng16/1.6.16/libpng-1.6.16.tar.xz

And now I'm not sure what command to give it next to try it again, since it's 
hard to narrow down the answer in a search, or even know what kind of command 
I'm looking for, being unfamiliar.  Would appreciate any pointers!
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