Minha pergunta vem do meu problema em começar 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, eu descobri que alguns programas dependem de bibliotecas que não vêm com a própria instalação, então eu 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 acontece, meu ffmpeg é cortado de 7 bibliotecas também. Eu pensei primeiro que cada uma dessas bibliotecas tem que ser instalada, mas que eu descobri que algumas ou todas podem ser instaladas, mas sua localização é desconhecida para o 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 em
/etc/ld.so.conf
cat /etc/ld.so.conf
include /etc/ld.so.conf.d/*.conf
mas muito /etc/ld.so.cache
Estou agora em um ponto onde me sinto perdido para investigar mais,
Pode ser um próximo passo útil para descobrir como posso determinar se uma determinada biblioteca está realmente instalada, mesmo que sua localização seja desconhecida para o ffmpeg.
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