Moje pytanie wynika z mojego problemu z uruchomieniem ffmpeg. Zainstalowałem ffmpeg i jest on wyświetlany jako zainstalowany:
whereis ffmpeg
ffmpeg: /usr/bin/ffmpeg /usr/bin/X11/ffmpeg /usr/share/ffmpeg /usr/share/man/man1/ffmpeg.1.gz
Później zorientowałem się, że niektóre programy zależą od bibliotek, które nie są dostarczane z samą instalacją, więc sprawdziłem za pomocą komendy ldd, czego brakuje:
# ldd /usr/bin/ffmpeg
linux-vdso.so.1 => (0x00007fff71fe9000)
libavfilter.so.0 => not found
libpostproc.so.51 => not found
libswscale.so.0 => not found
libavdevice.so.52 => not found
libavformat.so.52 => not found
libavcodec.so.52 => not found
libavutil.so.49 => not found
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f5f20bdf000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f5f209c0000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f5f205fb000)
/lib64/ld-linux-x86-64.so.2 (0x00007f5f20f09000)
Jak się okazuje moja ffmpeg jest odcięta od 7 bibliotek, też działa. Najpierw pomyślałem, że każda z tych bibliotek musi być zainstalowana, ale później zorientowałem się, że niektóre lub wszystkie mogą być zainstalowane, ale ich lokalizacja nie jest znana ffmpeg. Przeczytałem, że /etc/ld.so.conf i /etc/ld.so.cache zawierają ścieżki do bibliotek, ale byłem zdezorientowany, ponieważ była tylko jedna linia w
/etc/ld.so.conf
cat /etc/ld.so.conf
include /etc/ld.so.conf.d/*.conf
ale bardzo długo /etc/ld.so.cache
.
Jestem teraz w punkcie, w którym czuję się zagubiony, jak badać dalej. Może być pomocny następny krok, aby dowiedzieć się, w jaki sposób mogę ustalić, czy dana biblioteka jest rzeczywiście zainstalowana, nawet jeśli jej lokalizacja jest nieznana dla ffmpeg.
---------Output---of----apt-cache-policy-----request---------
apt-cache policy
Package files:
100 /var/lib/dpkg/status
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Pinned packages:
apt-get -f install
do swojego pytania? Uwaga: Ubuntu jest oparty na Ubuntu 14.04, więc możesz tam zajrzeć, jeśli ffmpeg nie jest zawarty w twojej dystrybucji.