My question originates from my problem in getting ffmpeg started.
I have installed ffmpeg and it is displayed as installed:
whereis ffmpeg
ffmpeg: /usr/bin/ffmpeg /usr/bin/X11/ffmpeg /usr/share/ffmpeg /usr/share/man/man1/ffmpeg.1.gz
Later, I figured out, that some programs depend on libraries that do not come with the installation itself, so I checked with ldd command what is missing:
# 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)
As it turns out my ffmpeg is cut off from 7 libraries too work. I first thought that each of those libraries have to be installed, but than I figured out, that some or all might be installed, but their location unknown to ffmpeg.
I read that /etc/ld.so.conf and /etc/ld.so.cache contain the paths to the libraries, but I was confused, because, there was only one line in
/etc/ld.so.conf
cat /etc/ld.so.conf
include /etc/ld.so.conf.d/*.conf
but a very long /etc/ld.so.cache.
I am now at a point where I feel lost how to investigate further,
It might be a helpful next step to figure out, how I can determine if a given library is indeed installed even if its location unknown to ffmpeg.
---------Output---of----apt-cache-policy-----request---------
apt-cache policy
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Pinned packages:
Best Answer
Look in /usr/lib and /usr/lib64 for those libraries. If you find one of the ones ffmpeg is missing, symlink it so it exists in the other directory.
You can also run a find for 'libm.so.6' and see where that file is at. There is a good chance ffmpeg is looking in the same directory for the missing ones. Symlink them over there once you find them.
If they don't exist on your server, install the package that includes them. If they are included in ffmpeg package but you don't see them, try reinstalling ffmpeg.