For the record: The concluding part of my experiment:

On Saturday 17 March 2012 at 22:16 Petra Ruebe-Pugliese
(de...@prp.in-berlin.de) wrote:

>  I suppose I'll have to install one by one each of
>  the formerly removed packages, starting by the libraries,
>  and see, after which installation moc stops playing again ...

 I first did
   dpkg -i libquicktime2_2%3a1.2.3-4+b3_i386.deb
 and
   dpkg -i libmjpegtools-2.0-0_2.0.0-0.5_i386.deb
 without ill effects on moc.

 Then it was no longer possible to proceed "one by one"
 because of conflicts with the installed Debian packages.

 The next step I took was:
 
,-----[ /bin/bash ]-------------------------------------------------
| netty:/var/cache/apt/archives# apt-get remove libavcodec-extra-53
| Reading package lists... Done
| Building dependency tree
| Reading state information... Done
| The following packages were automatically installed and are no longer 
required:
|   libtalloc2 libcdio10 libtwolame0 libva-x11-1 libmtp9 libegl1-mesa 
libdc1394-22
|   libxcb-keysyms1 libevent-execflow-perl vcdimager libsvga1 libanyevent-perl
|   libvamp-hostsdk3 libintl-perl libzvbi0 liblircclient0 libxcb-xv0 
libportsmf0 libtar0
|   libroar-compat1 libdca0 libx86-1 audacity-data libxcb-xfixes0 libflac++6 
libbs2b0
|   libcddb2 transcode-utils libaften0 libass4 libraw1394-11 libdvbpsi7 
libsmbclient
|   libggi-target-x dvdauthor libmtp-common python-gi libvlc5 libgbm1 
libcdio-cdda0
|   libavc1394-0 libggi2 libdirac-decoder0 libsoundtouch0 libevent-rpc-perl 
python-glade2
|   libgii1 gtk2-ex-formfactory-perl libupnp3 gir1.2-glib-2.0 libzvbi-common
|   avidemux-common lsdvd python-dbus libgirepository-1.0-1 liblzo2-2 
libxcb-randr0
|   libxcb-composite0 libvorbisidec1 libgii1-target-x fping libshout3 
libwbclient0
|   libiso9660-7 libxss1 libkate1 libcdio-paranoia0 gocr libevent-perl libvdpau1
|   libggiwmh0 vlc-data libvlccore5 libvcdinfo0 libebml3 libmatroska5 libmpeg2-4
|   libsdl-image1.2 liba52-0.7.4
| Use 'apt-get autoremove' to remove them.
| The following extra packages will be installed:
|   libavcodec53 libavformat53 libavutil51 libswscale2
| The following packages will be REMOVED:
|   libavcodec-extra-53 libavformat-extra-53 libavutil-extra-51 
libswscale-extra-2
| The following NEW packages will be installed:
|   libavcodec53 libavformat53 libavutil51 libswscale2
| 0 upgraded, 4 newly installed, 4 to remove and 47 not upgraded.
| Need to get 0 B/7,634 kB of archives.
| After this operation, 969 kB of additional disk space will be used.
| Do you want to continue [Y/n]?
| dpkg: libavcodec-extra-53: dependency problems, but removing anyway as you 
requested:
|  libsox-fmt-ffmpeg depends on libavcodec53 (>= 4:0.7-1) | libavcodec-extra-53 
(>= 4:0.7-1); however:
|   Package libavcodec53 is not installed.
|   Package libavcodec-extra-53 is to be removed.
|  libavformat-extra-53 depends on libavcodec-extra-53 (>= 4:0.8.0.1+b1).
|  libavformat-extra-53 depends on libavcodec-extra-53 (<< 4:0.8.0.1+b1-99).
|  libavformat-extra-53 depends on libavcodec-extra-53 (>= 4:0.8.0.1+b1).
|  libavformat-extra-53 depends on libavcodec-extra-53 (<< 4:0.8.0.1+b1-99).
|  libquicktime2 depends on libavcodec53 (>= 4:0.8-1~) | libavcodec-extra-53 
(>= 4:0.8-1~); however:
|   Package libavcodec53 is not installed.
|   Package libavcodec-extra-53 is to be removed.
| (Reading database ... 178101 files and directories currently installed.)
| Removing libavcodec-extra-53 ...
| dpkg: libavutil-extra-51: dependency problems, but removing anyway as you 
requested:
|  libsox-fmt-ffmpeg depends on libavutil51 (>= 4:0.7-1) | libavutil-extra-51 
(>= 4:0.7-1); however:
|   Package libavutil51 is not installed.
|   Package libavutil-extra-51 is to be removed.
|  libavformat-extra-53 depends on libavutil-extra-51 (>= 4:0.8.0.1+b1); 
however:
|   Package libavutil-extra-51 is to be removed.
|  libavformat-extra-53 depends on libavutil-extra-51 (<< 4:0.8.0.1+b1-99); 
however:
|   Package libavutil-extra-51 is to be removed.
|  libavformat-extra-53 depends on libavutil-extra-51 (>= 4:0.8.0.1+b1); 
however:
|   Package libavutil-extra-51 is to be removed.
|  libavformat-extra-53 depends on libavutil-extra-51 (<< 4:0.8.0.1+b1-99); 
however:
|   Package libavutil-extra-51 is to be removed.
|  libswscale-extra-2 depends on libavutil-extra-51 (>= 4:0.8.0.1+b1).
|  libswscale-extra-2 depends on libavutil-extra-51 (<< 4:0.8.0.1+b1-99).
|  libswscale-extra-2 depends on libavutil-extra-51 (>= 4:0.8.0.1+b1).
|  libswscale-extra-2 depends on libavutil-extra-51 (<< 4:0.8.0.1+b1-99).
| Removing libavutil-extra-51 ...
| dpkg: libswscale-extra-2: dependency problems, but removing anyway as you 
requested:
|  libquicktime2 depends on libswscale2 (>= 4:0.8-1~) | libswscale-extra-2 (>= 
4:0.8-1~); however:
|   Package libswscale2 is not installed.
|   Package libswscale-extra-2 is to be removed.
| Removing libswscale-extra-2 ...
| Selecting previously unselected package libavutil51.
| (Reading database ... 178073 files and directories currently installed.)
| Unpacking libavutil51 (from .../libavutil51_0.10-0.1_i386.deb) ...
| Unpacking libavcodec53 (from .../libavcodec53_0.10-0.1_i386.deb) ...
| Setting up libavutil51 (5:0.10-0.1) ...
| Setting up libavcodec53 (5:0.10-0.1) ...
| dpkg: libavformat-extra-53: dependency problems, but removing anyway as you 
requested:
|  libsox-fmt-ffmpeg depends on libavformat53 (>= 4:0.7-1) | 
libavformat-extra-53 (>= 4:0.7-1); however:
|   Package libavformat53 is not installed.
|   Package libavformat-extra-53 is to be removed.
|  moc-ffmpeg-plugin depends on libavformat53 (>= 4:0.8-1~) | 
libavformat-extra-53 (>= 4:0.8-1~); however:
|   Package libavformat53 is not installed.
|   Package libavformat-extra-53 is to be removed.
| (Reading database ... 178088 files and directories currently installed.)
| Removing libavformat-extra-53 ...
| Selecting previously unselected package libavformat53.
| (Reading database ... 178079 files and directories currently installed.)
| Unpacking libavformat53 (from .../libavformat53_0.10-0.1_i386.deb) ...
| Setting up libavformat53 (5:0.10-0.1) ...
| (Reading database ... 178087 files and directories currently installed.)
| Unpacking libswscale2 (from .../libswscale2_0.10-0.1_i386.deb) ...
| Setting up libswscale2 (5:0.10-0.1) ...
| netty:/var/cache/apt/archives#
`-----------------------------------------------------------------

 If I haven't missed something important, the net outcome of
 this was the reinstallation of

        libavcodec53
        libavformat53
        libavutil51
        libswscale2

 ...  and after this moc returned to its brokens state.

 So it seems that the lists of suspects has been narrowed down
 to four packages, and the next task should be to find out in
 what way which of the latest changes in moc conflicts with
 features in one or more of these packages.

 Because of
  moc-ffmpeg-plugin depends on libavformat53 (>= 4:0.8-1~) | 
libavformat-extra-53 (>= 4:0.8-1~); [...]
 I think attention should be centered on libavformat53.

 Just to be sure about the exact versions:

,-----[ /bin/bash 
]---------------------------------------------------------------------
| ~ > apt-cache policy libavformat53
| libavformat53:
|   Installed: 5:0.10-0.1
|   Candidate: 5:0.10-0.1
|   Version table:
|  *** 5:0.10-0.1 0
|         500 http://localhost/www.debian-multimedia.org/ testing/main i386 
Packages
|         100 /var/lib/dpkg/status
|      4:0.8-2 0
|         500 http://localhost/debian.tu-bs.de/debian/ testing/main i386 
Packages
| ~ >
`------------------------------------------------------------------------------------

 Someone else please take over!

 I am now _trying_ to put back my system into a coherent state.

    Petra



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