Sergio, here's what I get:

$ fedpkg build
Building avidemux-2.6.12-2.fc25 for rawhide
Created task: 14808402
Watching tasks (this may be safely interrupted)...
14808402 build (rawhide, /free/avidemux:52a92e702c83a6ecf39466ecc8109b1d9a8e486a): free
14808402 build (rawhide, /free/avidemux:52a92e702c83a6ecf39466ecc8109b1d9a8e486a): free -> open (buildvm-11.phx2.fedoraproject.org)
  14808403 buildSRPMFromSCM (/free/avidemux:52a92e702c83a6ecf39466ecc8109b1d9a8e486a): free
  14808403 buildSRPMFromSCM (/free/avidemux:52a92e702c83a6ecf39466ecc8109b1d9a8e486a): free -> open (buildvm-06.phx2.fedoraproject.org)
  14808403 buildSRPMFromSCM (/free/avidemux:52a92e702c83a6ecf39466ecc8109b1d9a8e486a): open (buildvm-06.phx2.fedoraproject.org) -> FAILED: BuildError: Error running GIT command "git clone -n git://pkgs.fedoraproject.org/free/avidemux /var/lib/mock/f25-build-5983575-617946/root/tmp/scmroot/avidemux", see checkout.log for details
  0 free  1 open  0 done  1 failed
14808402 build (rawhide, /free/avidemux:52a92e702c83a6ecf39466ecc8109b1d9a8e486a): open (buildvm-11.phx2.fedoraproject.org) -> FAILED: BuildError: Error running GIT command "git clone -n git://pkgs.fedoraproject.org/free/avidemux /var/lib/mock/f25-build-5983575-617946/root/tmp/scmroot/avidemux", see checkout.log for details
  0 free  0 open  0 done  2 failed

14808402 build (rawhide, /free/avidemux:52a92e702c83a6ecf39466ecc8109b1d9a8e486a) failed

Looking at checkout.log I see:

$ git clone -n git://pkgs.fedoraproject.org/free/avidemux /var/lib/mock/f25-build-5983575-617946/root/tmp/scmroot/avidemux
Cloning into '/var/lib/mock/f25-build-5983575-617946/root/tmp/scmroot/avidemux'...
fatal: remote error: access denied or repository not exported: /free/avidemux

Thanks,

Richard