Mi pregunta se origina en mi problema para iniciar ffmpeg. He instalado ffmpeg y se muestra como instalado:
whereis ffmpeg
ffmpeg: /usr/bin/ffmpeg /usr/bin/X11/ffmpeg /usr/share/ffmpeg /usr/share/man/man1/ffmpeg.1.gz
Más tarde, descubrí que algunos programas dependen de bibliotecas que no vienen con la instalación en sí, así que verifiqué con el comando ldd lo que falta:
# 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)
Como resultado, mi ffmpeg está cortado de 7 bibliotecas también funciona. Primero pensé que cada una de esas bibliotecas tenía que estar instalada, pero de lo que deduje, algunas o todas podrían estar instaladas, pero su ubicación es desconocida para ffmpeg. Leí que /etc/ld.so.conf y /etc/ld.so.cache contienen las rutas a las bibliotecas, pero estaba confundido, porque solo había una línea en
/etc/ld.so.conf
cat /etc/ld.so.conf
include /etc/ld.so.conf.d/*.conf
pero un tiempo muy largo /etc/ld.so.cache
.
Ahora estoy en un punto en el que me siento perdido cómo investigar más a fondo, podría ser un siguiente paso útil para averiguar, cómo puedo determinar si una biblioteca determinada está realmente instalada, incluso si su ubicación es desconocida para ffmpeg.
---------Output---of----apt-cache-policy-----request---------
apt-cache policy
Package files:
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release a=now
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origin packages.linuxmint.com
Pinned packages:
apt-get -f install
tu pregunta, por favor? Nota: ubuntu se basa en Ubuntu 14.04, por lo que puede buscar allí si ffmpeg no está incluido en su distribución.