[FFmpeg-user] Disable decoder for shared library

[tyler wear]

not exactly sure what the --enable-fft flag is doing, but it worked.

For the question about cross compiling, it is necessary when the CC is
looking for a different command with that prefix.

Thanks for all the help.
Tyler


On Tue, Feb 12, 2013 at 4:50 PM, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:

> tyler wear <tylerbwear <at> gmail.com> writes:
>
> > libavcodec/libavcodec.so: undefined reference to `ff_fft_calc_neon'
> > libavcodec/libavcodec.so: undefined reference to `ff_fft_fixed_calc_neon'
> > libavcodec/libavcodec.so: undefined reference to `ff_fft_permute_neon'
>
> I know this isn't your fault, but all ia32 and
> intel64 compilers / linkers I ever tested reported
> in which object files they found unresolved symbols...
>
> > collect2: ld returned 1 exit status
> > make: *** [ffprobe_g] Error 1
> >
> > full configure command:
> >
> > ./configure --enable-cross-compile
> > --cross-prefix=.../codesourcery/arm-2010q1/bin/arm-none-linux-gnueabi-
> > --cc=.../codesourcery/arm-2010q1/bin/arm-none-linux-gnueabi-gcc
>
> (100% unrelated: Is it really necessary to specify
> both a cross-prefix and an identical complete path
> to gcc? I never used cross-compilation.)
>
> > --arch=arm --target-os=linux --enable-armv5te --disable-armv6
> > --disable-mmx --enable-shared --disable-doc --disable-htmlpages
> > --disable-manpages --disable-podpages --disable-txtpages
> > --disable-avdevice --disable-swresample --disable-swscale
> > --disable-postproc --enable-small --disable-avfilter --disable-debug
> > --disable-ffserver --disable-ffplay --extra-cflags=-fPIC
> > --enable-gpl  --disable-network  --disable-zlib
> > --disable-ffmpeg  --disable-encoders --disable-decoders
>
> It is absolutely possible (and even likely) that there
> is a bug, but since I honestly don't see how this
> configure line makes any sense and I cannot reproduce
> the problem on intel64, I suggest you simply add
> --enable-fft.
>
> If you want to fix this yourself, search for the file in
> libavcodec/arm that is missing an "#if CONFIG_FFT" and
> add it there, don't forget to send a patch.
>
> Carl Eugen
>
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>



-- 
Tyler B. Wear
Qualcomm - Software Engineer