HandBrake / private libraries

[Bernard Johnson]

I'd like to submit a package for HandBrake (http://handbrake.fr).  I 
have a package that compiles well, but uses private libraries.  One 
reason that it does this is to patch in features or patch out bugs not 
released in upstream yet.

HandBrake originally used these private libraries:

a52dec-0.7.4.tar.gz + A52_DOLBY patch
faac-1.26.tar.gz
faad2-2.6.1.tar.gz
ffmpeg-r15462.tar.gz, precursor to 0.5 + several patches
lame-3.98.tar.gz
libdca-r81-strapped.tar.gz + additional ABI changes
libdvdread-0.9.7.tar.gz
libmkv-0.6.3.tar.gz
libmp4v2-r45.tar.gz
libogg-1.1.3.tar.gz
libsamplerate-0.1.4.tar.gz
libtheora-1.0.tar.gz
libvorbis-aotuv_b5.tar.gz
mpeg2dec-0.5.1.tar.gz + patch
x264-r1028-83baa7f.tar.gz + several patches
xvidcore-1.1.3.tar.gz + fdct patch


In some cases, I was able to just remove the private library, and in 
other cases I was able to verify upstream had integrated the patches and 
replace with a newer version.  Once instance required patching out minor 
functionality from HandBrake.  In a few cases, I dropped the private 
library and it's patch hoping that it would not impact the quality of 
the product.  I've even had one success with a downrev.  One library has 
been submitted to Fedora.

I'm still left with these five private libraries that seem to be 
considerably different from upstream (either in snapshot or patches). 
I'm afraid that removing these actually will impact functionality or 
stability:

a52dec-0.7.4.tar.gz + A52_DOLBY patch
ffmpeg-r15462.tar.gz, precursor to 0.5 + several patches
libdca-r81-strapped.tar.gz + additional ABI changes
libmp4v2-r45.tar.gz
x264-r1028-83baa7f.tar.gz + several patches

So my question - before submitting a RPM for review:  How aggressive 
should I be in removing private libraries?  Should I remove them at the 
expense of functionality?  Or just as many as I can that allows the 
product to be fully functional?