Minha pergunta se origina do meu problema em iniciar o ffmpeg. Eu instalei o ffmpeg e ele é exibido como instalado:
whereis ffmpeg
ffmpeg: /usr/bin/ffmpeg /usr/bin/X11/ffmpeg /usr/share/ffmpeg /usr/share/man/man1/ffmpeg.1.gz
Mais tarde, descobri que alguns programas dependem de bibliotecas que não vêm com a instalação em si, então verifiquei com o comando ldd o que está faltando:
# 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 se vê, meu ffmpeg é cortado de 7 bibliotecas também funciona. Primeiro pensei que cada uma dessas bibliotecas deveria ser instalada, mas do que eu imaginava, que algumas ou todas podem estar instaladas, mas sua localização é desconhecida pelo ffmpeg. Eu li que /etc/ld.so.conf e /etc/ld.so.cache contêm os caminhos para as bibliotecas, mas fiquei confuso, porque havia apenas uma linha
/etc/ld.so.conf
cat /etc/ld.so.conf
include /etc/ld.so.conf.d/*.conf
mas muito tempo /etc/ld.so.cache
.
Agora estou em um ponto em que me sinto perdido em como investigar mais. Pode ser um próximo passo útil para descobrir, como posso determinar se uma determinada biblioteca está realmente instalada, mesmo que seu local seja desconhecido para ffmpeg.
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Pinned packages:
apt-get -f install
sua pergunta, por favor? Nota: O ubuntu é baseado no Ubuntu 14.04, então você pode procurar lá se o ffmpeg não estiver incluído na sua distribuição.