libav 9 is available in the motumedia PPA: https://launchpad.net/~motumedia/+archive/libav9-raring/+packages
Build logs:
https://launchpad.net/~motumedia/+archive/libav9-raring/+build/3959131
amitk_canvas.o amitk_canvas_object.o amitk_color_table.o amitk_color_table_menu.o amitk_data_set.o amitk_dial.o amitk_fiducial_mark.o amitk_filter.o amitk_line_profile.o amitk_object.o amitk_object_dialog.o amitk_point.o amitk_preferences.o amitk_progress_dialog.o amitk_raw_data.o amitk_roi.o amitk_space.o amitk_space_edit.o amitk_study.o amitk_threshold.o amitk_tree_view.o amitk_volume.o amitk_window_edit.o alignment_mutual_information.o alignment_procrustes.o analysis.o dcmtk_interface.o fads.o image.o legacy.o libecat_interface.o libmdc_interface.o mpeg_encode.o pixmaps.o raw_data_import.o render.o tb_alignment.o tb_crop.o tb_export_data_set.o tb_fads.o tb_filter.o tb_fly_through.o tb_math.o tb_profile.o tb_roi_analysis.o ui_common.o ui_gate_dialog.o ui_preferences_dialog.o ui_render.o ui_render_dialog.o ui_render_movie.o ui_series.o ui_study.o ui_study_cb.o ui_time_dialog.o xml.o -pthread -L/usr/lib -lgsl -lgslcblas /usr/lib/libvolpack.so -lxml2 -lgnomecanvas-2 -lart_lgpl_2 -lgtk-x11-2.0 -lgdk-x11-2.0 -latk-1.0 -lgio-2.0 -lpangoft2-1.0 -lpangocairo-1.0 -lgdk_pixbuf-2.0 /usr/lib/x86_64-linux-gnu/libcairo.so -lpango-1.0 /usr/lib/x86_64-linux-gnu/libfreetype.so -lfontconfig /usr/lib/x86_64-linux-gnu/libgnomevfs-2.so -lgconf-2 -lgthread-2.0 -lgmodule-2.0 -lrt -lgobject-2.0 /usr/lib/libmdc.so -lm -L/usr/lib/x86_64-linux-gnu -lglib-2.0 -lpng12 -ldcmdata -lofstd -loflog -lavcodec -lavutil -lz -lpthread -pthread
mpeg_encode.o: In function `mpeg_encoding_init':
/build/buildd/amide-1.0.1/src/mpeg_encode.c:215: undefined reference to `avcodec_init'
mpeg_encode.o: In function `mpeg_encode_setup':
/build/buildd/amide-1.0.1/src/mpeg_encode.c:264: undefined reference to `avcodec_alloc_context'
/build/buildd/amide-1.0.1/src/mpeg_encode.c:302: undefined reference to `avcodec_open'
collect2: error: ld returned 1 exit status
This bug was fixed in the package amide - 1.0.1-1ubuntu1
---------------
amide (1.0.1-1ubuntu1) raring; urgency=low
* Fix compilation against Libav 9. LP: #1075665
-- Reinhard Tartler <email address hidden> Tue, 06 Nov 2012 16:23:36 +0100