[opus] Compiling FFmpeg with libopencore-amrnb and opus-git.

[Jean-Marc Valin]

It appears that both Opus and amrnb have a function called
preemphasis(). In the short term, your options are:
1) Not building statically
2) Renaming that function in the Opus code
3) Renaming that function in the amrnb code

I can do the rename for the next version of libopus.

Cheers,

	Jean-Marc

On 11/13/2013 05:51 PM, batguano999 wrote:
> 
> Hi
> Any idea what's causing these errors:-
> 
> /home/user/build/lib/libopencore-amrnb.a(preemph.o): In function `preemphasis':
> /home/user/build/opencore-amr-0.1.3/amrnb/../opencore/codecs_v2/audio/gsm_amr/amr_nb/dec/src/preemph.cpp:193: multiple definition of `preemphasis'
> /home/user/build/lib/libopus.a(celt_encoder.o):/home/user/build/opus/celt/celt_encoder.c:455: first defined here
> collect2: error: ld returned 1 exit status
> Makefile:105: recipe for target 'ffmpeg_g' failed
> make: *** [ffmpeg_g] Error 1
> 
> Compiling FFmpeg with "--enable-libopencore-amrnb --enable-libopus".
> With opus-git-a71c9ad FFmpeg gives the errors and fails to build. :-(
> With opus-1.1-beta FFmpeg builds OK. :-)
> 
> @arch ~]$ ./ffmpeg
> ffmpeg version 2.1 Copyright (c) 2000-2013 the FFmpeg developers
>   built on Nov 13 2013 22:45:33 with gcc 4.8.2 (GCC)
>   configuration: --extra-cflags=-I/home/user/build/include --extra-ldflags=-L/home/user/build/lib --enable-libopencore-amrnb --enable-libopus --enable-version3
>   libavutil      52. 48.100 / 52. 48.100
>   libavcodec     55. 39.100 / 55. 39.100
>   libavformat    55. 19.104 / 55. 19.104
>   libavdevice    55.  5.100 / 55.  5.100
>   libavfilter     3. 90.100 /  3. 90.100
>   libswscale      2.  5.101 /  2.  5.101
>   libswresample   0. 17.104 /  0. 17.104
> 
> Tests were carried out using...
> ArchBang Linux OS.
> FFmpeg-2.1.
> opencore-amr-0.1.3.
> 
> Test build scripts...
> "bad" is here ---> http://pastebin.com/raw.php?i=vfvEDHG8
> "good" is here ---> http://pastebin.com/raw.php?i=kxuAQQBD
> 
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