La mia domanda nasce dal mio problema nell'avvio di ffmpeg. Ho installato ffmpeg e viene visualizzato come installato:
whereis ffmpeg
ffmpeg: /usr/bin/ffmpeg /usr/bin/X11/ffmpeg /usr/share/ffmpeg /usr/share/man/man1/ffmpeg.1.gz
Successivamente, ho capito che alcuni programmi dipendono da librerie che non vengono fornite con l'installazione stessa, quindi ho controllato con il comando ldd cosa manca:
# 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)
A quanto pare il mio ffmpeg è tagliato anche da 7 librerie. In primo luogo ho pensato che ognuna di quelle librerie dovesse essere installata, ma di quanto ho capito, che alcune o tutte potrebbero essere installate, ma la loro posizione è sconosciuta a ffmpeg. Ho letto che /etc/ld.so.conf e /etc/ld.so.cache contengono i percorsi delle librerie, ma ero confuso, perché c'era solo una riga in
/etc/ld.so.conf
cat /etc/ld.so.conf
include /etc/ld.so.conf.d/*.conf
ma molto lungo /etc/ld.so.cache
.
Ora sono a un punto in cui mi sento perso come indagare ulteriormente, Potrebbe essere un utile passo successivo per capire, come posso determinare se una determinata libreria è effettivamente installata anche se la sua posizione è sconosciuta a ffmpeg.
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Pinned packages:
apt-get -f install
tua domanda, per favore? Nota: ubuntu si basa su Ubuntu 14.04, quindi puoi guardare lì se ffmpeg non è incluso nella tua distribuzione.