Many of the mythtv dependencies may very well be taken care of now, my last attempt was shortly after 0.28 was released and I could use the qt5 from EPEL.

Here's the list of packages that it took for me to get a good build:

a52dec-0.7.4-15.el7.centos.3.src.rpm

arts-1.5.10-26.el7.centos.src.rpm

celt-0.11.3-3.el7.centos.src.rpm

faad2-2.7-6.el7.centos.src.rpm

ffmpeg-2.2.9-1.el7.centos.src.rpm

gpac-0.5.0-11.20140915svn.el7.centos.src.rpm

iguanaIR-1.1.0-11.el7.centos.src.rpm

lame-3.99.5-1.el7.centos.src.rpm

libbs2b-3.1.0-13.el7.centos.src.rpm

libdc1394-2.2.2-3.el7.centos.src.rpm

libdca-0.0.5-6.el7.centos.src.rpm

libftdi-1.1-4.el7.centos.src.rpm

libmad-0.15.1b-14.el7.centos.src.rpm

libmodplug-0.8.8.5-3.el7.centos.src.rpm

libmpeg2-0.5.1-11.el7.centos.src.rpm

libquicktime-1.2.4-17.el7.centos.src.rpm

lirc-0.9.1a-4.el7.centos.src.rpm

mjpegtools-2.1.0-4.el7.centos.src.rpm

mpg123-1.19.0-2.el7.centos.src.rpm

mplayer-1.1-29.20140919svn.el7.centos.src.rpm

mythtv-0.27.3-2.2.el7.centos.src.rpm

mythweb-0.27.3-1.el7.centos.src.rpm

nas-1.9.4-2.el7.centos.src.rpm

perl-Email-Find-0.10-18.el7.centos.src.rpm

perl-HTML-FromText-2.07-3.el7.centos.src.rpm

perl-HTTP-Cache-Transparent-1.1-5.el7.centos.src.rpm

perl-Image-Size-3.232-5.el7.centos.src.rpm

perl-Lingua-EN-Numbers-2.00-1.el7.centos.src.rpm

perl-Lingua-EN-Numbers-Ordinate-1.03-2.el7.centos.src.rpm

perl-Lingua-Preferred-0.2.4-19.el7.centos.src.rpm

perl-Log-TraceMessages-1.4-18.el7.centos.src.rpm

perl-Net-UPnP-1.4.2-15.el7.centos.src.rpm

perl-Term-ProgressBar-2.16-1.el7.centos.src.rpm

perl-Tk-TableMatrix-1.23-22.el7.centos.src.rpm

python-oauth-1.0.1-9.el7.centos.src.rpm

rtmpdump-2.3-3.el7.centos.src.rpm

SDL_gfx-2.0.25-2.el7.centos.src.rpm

twolame-0.3.13-4.el7.centos.src.rpm

x264-0.120-4.20120303.el7.centos_bootstrap.src.rpm

x264-0.120-5.20120303.el7.centos.src.rpm

xmltv-0.5.63-1.el7.centos.src.rpm

xmms-1.2.11-22.20071117cvs.el7.centos.src.rpm

xvidcore-1.3.2-3.el7.centos.src.rpm

Thanks,

Richard