[FFmpeg-trac] #1465(build system:new): atempo filter fails to compile when ffmpeg is configured without rdft

[FFmpeg]

#1465: atempo filter fails to compile when ffmpeg is configured without rdft
-------------------------------------+-------------------------------------
             Reporter:  jamal        |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  build        |                  Version:  git-
  system                             |  master
             Keywords:  atempo       |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Any ffmpeg configuration that enables the atempo filter but doesn't enable
 rdft will fail to compile with the following errors:

 {{{
 LD      ffmpeg_g.exe
 libavfilter/libavfilter.a(af_atempo.o): In function `yae_flush':
 D:/msys/1.0/home/jamal/ffmpeg/src/libavfilter/af_atempo.c:906: undefined
 reference to `_av_rdft_calc'
 libavfilter/libavfilter.a(af_atempo.o): In function `yae_xcorr_via_rdft':
 D:/msys/1.0/home/jamal/ffmpeg/src/libavfilter/af_atempo.c:611: undefined
 reference to `_av_rdft_calc'
 libavfilter/libavfilter.a(af_atempo.o): In function `yae_release_buffers':
 D:/msys/1.0/home/jamal/ffmpeg/src/libavfilter/af_atempo.c:204: undefined
 reference to `_av_rdft_end'
 D:/msys/1.0/home/jamal/ffmpeg/src/libavfilter/af_atempo.c:207: undefined
 reference to `_av_rdft_end'
 libavfilter/libavfilter.a(af_atempo.o): In function `yae_reset':
 D:/msys/1.0/home/jamal/ffmpeg/src/libavfilter/af_atempo.c:259: undefined
 reference to `_av_rdft_end'
 D:/msys/1.0/home/jamal/ffmpeg/src/libavfilter/af_atempo.c:262: undefined
 reference to `_av_rdft_end'
 D:/msys/1.0/home/jamal/ffmpeg/src/libavfilter/af_atempo.c:265: undefined
 reference to `_av_rdft_init'
 D:/msys/1.0/home/jamal/ffmpeg/src/libavfilter/af_atempo.c:271: undefined
 reference to `_av_rdft_init'
 libavfilter/libavfilter.a(af_atempo.o): In function `yae_apply':
 D:/msys/1.0/home/jamal/ffmpeg/src/libavfilter/af_atempo.c:815: undefined
 reference to `_av_rdft_calc'
 libavfilter/libavfilter.a(af_atempo.o): In function `yae_xcorr_via_rdft':
 D:/msys/1.0/home/jamal/ffmpeg/src/libavfilter/af_atempo.c:611: undefined
 reference to `_av_rdft_calc'
 libavfilter/libavfilter.a(af_atempo.o): In function `yae_apply':
 D:/msys/1.0/home/jamal/ffmpeg/src/libavfilter/af_atempo.c:847: undefined
 reference to `_av_rdft_calc'
 collect2.exe: error: ld returned 1 exit status
 make: *** [ffmpeg_g.exe] Error 1
 }}}

 The solution would be to either make the atempo filter depend on rdft or
 to force the later's compilation.
 Either making
 {{{
 atempo_filter_deps="avcodec"
 }}}
 be
 {{{
 atempo_filter_deps="avcodec rdft"
 }}}
 or by adding a new line like
 {{{
 atempo_filter_select="rdft"
 }}}
 [[BR]]
 Considering that none of the other filters force the compilation of any
 other component, maybe the former is the better option.

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1465>
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