Le 10 oct. 2009 à 13:53, Russell Edwards a écrit :
Hello Everyone.
I'm sure that this question has been asked many times so my apologies
if i'm going over old ground.
I'm trying to develop a specialist one-off media player for Mac OS X
and
Windows. I'm doing my main development on OS X 10.5.8.
I'm a fairly proficient programmer but much of my work of done using
xcode
with java or Qt (which has an automatic installer) so the full
procedure for
installing things via the command line is a little alien.
I have followed the process for installing FFmpeg as given on the main
documents page. and have set the following flags when running
configure.
--enable-shared
--enable-static
--enable-libmp3lame
--enable-libfaac
--enable-libfaad
--disable-mmx
--arch=x86_64
--enable-gpl
--enable-nonfree
The header files are located in /usr/local/include/libxxxx/xxxx.h
and calling ffmpeg -h gives me the help file, so it has been
included in my
path
I have written a simple c file that just makes a call to
av_register_all and
this fails to compile. Initially it failed because gcc couldn't find
the header
files both with and without the -lavcodec and -lavformat flags given
in Martin
Bohme's example.
This suggests that the install didn't complete properly as
the directories haven't been added to gcc's search path.
Not a surprise as -l flags (lower case L) are used to tell the liker
which libraries it has to use, but not to tell anything about header
paths to the compiler.
To tell the compiler to search header in non-standard location, you
have to use the -I flags (upper case i).
gcc -I/path/to/my/header/ -I/other/path/to/custom/headers -c myfile.c
I therefore put in a direct reference to the header files. This
results in a
different error of : -
Undefined symbols:
"av_register_all()", referenced from:
_main in ccTlsXof.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
I also tried adding the -static flag to the g++ call and get the
following error
that cant be removed even by adding the -dynamic flag as requested
/var/folders/VP/VPvhBRGPHTmiDcjDfUtnTk+++TI/-Tmp-//cczY3qou.s:64:
FATAL:incompatible feature used: section type
non_lazy_symbol_pointers
(must specify "-dynamic" to be used)
Does anyone have any ideas what i am / have done wrong?
Many Thanks
Russell Edwards
-- Jean-Daniel
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