I have installed ffmpeg from the Ubuntu repositories. This creates the
following files:
* /usr/bin/ffmpeg
* /usr/lib/libavcodec.so.51.50
* /usr/lib/libavformat.so.52.7.0
* /usr/lib/i686/cmov/libavcodec.so.51
* /usr/lib/i686/cmov/libavformat.so.52
as well as some others, including some symlinks.
I have also built a new version of ffmpeg from the ffmpeg project. This
creates the following files:
* /usr/local/bin/ffmpeg
* /usr/local/lib/libavcodec.so.52.18
* /usr/local/lib/libavformat.so.52.29.2
and some others.
$ which ffmpeg reports /usr/local/bin.
When I run ffmpeg, it fails with a message about a missing symbol.
I know that all the libraries have been built correctly, because if I
set LD_LIBRARY_PATH=/usr/local/lib, then my new ffmpeg works correctly.
I read somewhere on google that it is Bad to set LD_LIBRARY_PATH, except
during development or to work around problems that have no other solution.
I have modified /etc/ld.so.conf, adding /usr/local/lib at the top of the
file, and run ldconfig -v; it indicates that the correctly libraries are
there in /usr/local/lib, and are at the top of the listing, so I assume
that they are loaded first.
Now, the only indication that something is wrong comes from
$ ldd /usr/local/bin/ffmpeg
:
: snip
:
libavformat.so.52 => /usr/lib/i686/cmov/libavformat.so.52 (0xb7ffa000)
libavcodec.so.52 => /usr/local/lib/libavcodec.so.52 (0xb7823000)
This shows that /usr/local/bin/ffmpeg is trying to use version 52 of
libavcodec; there is only the one in /usr/local/lib, so it uses the
right one.
However, it is trying to use version 0.52 of libavformat: there are two
of these. For some reason, it is ignoring the setting in /etc/ld.so.conf
and using the /usr/lib/i686/... version instead of my one.
* Is there something INSIDE /usr/local/bin/ffmpeg that makes it
prefer the /usr/lib... version? If so, how do I override it?
* Is /etc/ld.so.conf and ldconfig broken?
* ./configure can somehow detect which libraries are installed.
Perhaps this is broken and uses the wrong search path.
* How do I make it use MY version of libavcodec, libavformat, etc
without resorting to LD_LIBRARY_PATH?
* There is another library (libx264) that gives the same problem...
Some heavyweight solutions spring to mind:
* install into /usr/bin and /usr/lib, overwriting those files from
the packages; however, I am concerned that this will break during
upgrades.
* remove ffmpeg and its dependencies; however, this will mean
uninstalling everything that depends on these packages. I would
prefer not to do this.
* create my own .deb package and install that
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