I did a 'yum update' just to see if anything had changed as a result of removing 'ffmpeg' and got the following:
[root@localhost philtr]# yum update
Loading "installonlyn" plugin
Setting up Update Process
Setting up repositories
Reading repository metadata in from local files
Resolving Dependencies
--> Populating transaction set with selected packages. Please wait.
---> Package apt.i386 0:0.5.15lorg3.2-9.fc6 set to be updated
---> Package libdca.i386 0:0.0.2-3.lvn6 set to be updated
---> Package lame.i386 0:3.97-3.lvn6 set to be updated
---> Package lesstif-devel.i386 0:0.95.0-15.fc6 set to be updated
---> Package lame-devel.i386 0:3.97-3.lvn6 set to be updated
---> Package hplip.i386 0:1.6.10-1.fc6.4 set to be updated
---> Package redhat-menus.noarch 0:6.7.8-2.fc6 set to be updated
---> Package hpijs.i386 1:1.6.10-1.fc6.4 set to be updated
---> Package libsane-hpaio.i386 0:1.6.10-1.fc6.4 set to be updated
--> Running transaction check
--> Processing Dependency: libmp3lame.so.0 for package: lame-devel
--> Processing Dependency: lame-libs = 3.97-3.lvn6 for package: lame
--> Processing Dependency: lame-libs = 3.97-3.lvn6 for package: lame-devel
--> Processing Dependency: libmp3lame.so.0 for package: lame
--> Restarting Dependency Resolution with new changes.
--> Populating transaction set with selected packages. Please wait.
---> Package lame-libs.i386 0:3.97-3.lvn6 set to be updated
--> Running transaction check
Dependencies Resolved
=============================================================================
Package Arch Version Repository Size
=============================================================================
Installing:
lesstif-devel i386 0.95.0-15.fc6 extras 473 k
replacing openmotif-devel.i386 2.2.3-10.FC4.2
Updating:
apt i386 0.5.15lorg3.2-9.fc6 extras 988 k
hpijs i386 1:1.6.10-1.fc6.4 updates 288 k
hplip i386 1.6.10-1.fc6.4 updates 8.4 M
lame i386 3.97-3.lvn6 livna 327 k
lame-devel i386 3.97-3.lvn6 livna 22 k
libdca i386 0.0.2-3.lvn6 livna 103 k
libsane-hpaio i386 1.6.10-1.fc6.4 updates 58 k
redhat-menus noarch 6.7.8-2.fc6 updates 203 k
Installing for dependencies:
lame-libs i386 3.97-3.lvn6 livna 331 k
Transaction Summary
=============================================================================
Install 2 Package(s)
Update 8 Package(s)
Remove 0 Package(s)
Total download size: 11 M
Is this ok [y/N]: y
Downloading Packages:
(1/7): libdca-0.0.2-3.lvn 100% |=========================| 103 kB 00:00
(2/7): lame-3.97-3.lvn6.i 100% |=========================| 327 kB 00:02
(3/7): lesstif-devel-0.95 100% |=========================| 473 kB 00:01
(4/7): lame-devel-3.97-3. 100% |=========================| 22 kB 00:00
http://redhat.secsup.org/fedora/core...c6.noarch.rpm: [Errno 4] IOError: <urlopen error (101, 'Network is unreachable')>
Trying other mirror.
(5/7): redhat-menus-6.7.8 100% |=========================| 203 kB 00:00
(6/7): lame-libs-3.97-3.l 100% |=========================| 331 kB 00:02
(7/7): libsane-hpaio-1.6. 100% |=========================| 58 kB 00:00
Running Transaction Test
Finished Transaction Test
Transaction Check Error: file /etc/apt/apt.conf from install of apt-0.5.15lorg3.2-9.fc6 conflicts with file from package apt-config-2.0.dockyard-1ark
file /etc/apt/rpmpriorities from install of apt-0.5.15lorg3.2-9.fc6 conflicts with file from package apt-config-2.0.dockyard-1ark
file /etc/apt/sources.list from install of apt-0.5.15lorg3.2-9.fc6 conflicts with file from package apt-config-2.0.dockyard-1ark
file /etc/apt/vendors.list from install of apt-0.5.15lorg3.2-9.fc6 conflicts with file from package apt-config-2.0.dockyard-1ark
Next I removed the old version of 'apt':
[root@localhost philtr]# rpm -q apt
apt-0.5.15lorg3.2-9.fc4
[root@localhost philtr]# rpm -e apt-0.5.15lorg3.2-9.fc4
And did another 'update':
[root@localhost philtr]# yum update
Loading "installonlyn" plugin
Setting up Update Process
Setting up repositories
Reading repository metadata in from local files
Resolving Dependencies
--> Populating transaction set with selected packages. Please wait.
---> Package libdca.i386 0:0.0.2-3.lvn6 set to be updated
---> Package lame.i386 0:3.97-3.lvn6 set to be updated
---> Package lesstif-devel.i386 0:0.95.0-15.fc6 set to be updated
---> Package lame-devel.i386 0:3.97-3.lvn6 set to be updated
---> Package hplip.i386 0:1.6.10-1.fc6.4 set to be updated
---> Package redhat-menus.noarch 0:6.7.8-2.fc6 set to be updated
---> Package hpijs.i386 1:1.6.10-1.fc6.4 set to be updated
---> Package libsane-hpaio.i386 0:1.6.10-1.fc6.4 set to be updated
--> Running transaction check
--> Processing Dependency: libmp3lame.so.0 for package: lame-devel
--> Processing Dependency: lame-libs = 3.97-3.lvn6 for package: lame
--> Processing Dependency: lame-libs = 3.97-3.lvn6 for package: lame-devel
--> Processing Dependency: libmp3lame.so.0 for package: lame
--> Restarting Dependency Resolution with new changes.
--> Populating transaction set with selected packages. Please wait.
---> Package lame-libs.i386 0:3.97-3.lvn6 set to be updated
--> Running transaction check
Dependencies Resolved
=============================================================================
Package Arch Version Repository Size
=============================================================================
Installing:
lesstif-devel i386 0.95.0-15.fc6 extras 473 k
replacing openmotif-devel.i386 2.2.3-10.FC4.2
Updating:
hpijs i386 1:1.6.10-1.fc6.4 updates 288 k
hplip i386 1.6.10-1.fc6.4 updates 8.4 M
lame i386 3.97-3.lvn6 livna 327 k
lame-devel i386 3.97-3.lvn6 livna 22 k
libdca i386 0.0.2-3.lvn6 livna 103 k
libsane-hpaio i386 1.6.10-1.fc6.4 updates 58 k
redhat-menus noarch 6.7.8-2.fc6 updates 203 k
Installing for dependencies:
lame-libs i386 3.97-3.lvn6 livna 331 k
Transaction Summary
=============================================================================
Install 2 Package(s)
Update 7 Package(s)
Remove 0 Package(s)
Total download size: 10 M
Is this ok [y/N]: y
Downloading Packages:
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
Updating : hpijs ####################### [ 1/17]
Installing: lame-libs ####################### [ 2/17]
Updating : libsane-hpaio ####################### [ 3/17]
Updating : libdca ####################### [ 4/17]
Updating : lame ####################### [ 5/17]
Installing: lesstif-devel ####################### [ 6/17]
Updating : lame-devel ####################### [ 7/17]
Updating : hplip ####################### [ 8/17]
Updating : redhat-menus ####################### [ 9/17]
Cleanup : libdca ####################### [10/17]
Cleanup : lame ####################### [11/17]
Removing : openmotif-devel ####################### [12/17]
Cleanup : lame-devel ####################### [13/17]
Cleanup : hplip ####################### [14/17]
Cleanup : redhat-menus ####################### [15/17]
Cleanup : hpijs ####################### [16/17]
Cleanup : libsane-hpaio ####################### [17/17]
Installed: lesstif-devel.i386 0:0.95.0-15.fc6
Dependency Installed: lame-libs.i386 0:3.97-3.lvn6
Updated: hpijs.i386 1:1.6.10-1.fc6.4 hplip.i386 0:1.6.10-1.fc6.4 lame.i386 0:3.97-3.lvn6 lame-devel.i386 0:3.97-3.lvn6 libdca.i386 0:0.0.2-3.lvn6 libsane-hpaio.i386 0:1.6.10-1.fc6.4 redhat-menus.noarch 0:6.7.8-2.fc6
Replaced: openmotif-devel.i386 0:2.2.3-10.FC4.2
Complete!
[root@localhost philtr]# yum check-update -C
Loading "installonlyn" plugin
Setting up repositories
Reading repository metadata in from local files
[root@localhost philtr]#
Now the question is, was it the old version of 'apt' the problem all along? Such are the mysteries of the universe. phil