Linking ffplay fails if --disable-swresample is used

[Hanspeter Niederstrasser]

When linking ffplay on OS X with latest git using --disable-libswresample, this failure occurs:

clang -Llibavcodec -Llibavdevice -Llibavfilter -Llibavformat -Llibavutil -Llibpostproc -Llibswscale -Llibswresample -Wl,-dynamic,-search_paths_first -o ffplay_g ffplay.o cmdutils.o -lavdevice -lavfilter -lavformat -lavcodec -lpostproc -lswscale -lavutil -lX11 -lXext -lXfixes -lcdio_paranoia -lcdio_cdda -lcdio -ljack -L/sw/lib -Wl,-framework,Cocoa -lSDLmain -lSDL -lxvidcore -lx264 -lvpx -lvpx -lvorbisenc -lvorbis -logg -ltheoraenc -ltheoradec -logg -lspeex -L/sw/lib -lschroedinger-1.0 -lpthread -loil-0.3 -L/sw/lib -lrtmp -lssl -lcrypto -lz -lopenjpeg -lopencore-amrwb -lopencore-amrnb -lmp3lame -lmodplug -L/sw/lib -lfreetype -L/sw/lib -ldirac_encoder -ldirac_decoder -lm -lstdc++ -lcelt0 -lcelt0 -L/sw/lib -lass -lm -framework CoreFoundation -framework VideoDecodeAcceleration -framework QuartzCore -lbz2 -lz -L/sw/lib -L/usr/X11/lib  -L/sw/lib -Wl,-framework,Cocoa -lSDLmain -lSDL
ld: warning: directory not found for option '-Llibswresample'
Undefined symbols for architecture x86_64:
  "_swr_free", referenced from:
      _stream_component_close in ffplay.o
      _sdl_audio_callback in ffplay.o
  "_swr_alloc_set_opts", referenced from:
      _sdl_audio_callback in ffplay.o
  "_swr_init", referenced from:
      _sdl_audio_callback in ffplay.o
  "_swr_set_compensation", referenced from:
      _sdl_audio_callback in ffplay.o
  "_swr_convert", referenced from:
      _sdl_audio_callback in ffplay.o
ld: symbol(s) not found for architecture x86_64

Linking libavfilter.dylib similarly fails when --disable-swscale is used.

The following fixes both of these issues:

diff --git a/configure b/configure
index 525092d..4c3aa07 100755
--- a/configure
+++ b/configure
@@ -1674,11 +1674,12 @@ yadif_filter_deps="gpl"
 
 # libraries
 avdevice_deps="avcodec avformat"
+avfilter_deps="swscale"
 avformat_deps="avcodec"
 postproc_deps="gpl"
 
 # programs
-ffplay_deps="avcodec avformat swscale sdl"
+ffplay_deps="avcodec avformat swscale swresample sdl"
 ffplay_select="buffersink_filter rdft"
 ffprobe_deps="avcodec avformat"
 ffserver_deps="avformat ffm_muxer fork rtp_protocol rtsp_demuxer"

[Michael Niedermayer]

the ffplay_deps change LGTM

the avfilter change should not be needed, how can we reproduce that problem?

[Hanspeter Niederstrasser]

With --disable-swscale in ./configure:

LD	libavfilter/libavfilter.2.dylib
ld: warning: directory not found for option '-Llibswscale'
Undefined symbols for architecture x86_64:
  "_sws_convertPalette8ToPacked32", referenced from:
      _put_image in vf_palette.o
  "_sws_convertPalette8ToPacked24", referenced from:
      _put_image in vf_palette.o
  "_sws_freeContext", referenced from:
      _uninit in vf_sab.o
      _uninit in vf_screenshot.o
      _uninit in vf_smartblur.o
  "_sws_scale", referenced from:
      _blur in vf_sab.o
      _put_image in vf_screenshot.o
      _draw_slice in vf_screenshot.o
      _blur in vf_smartblur.o
  "_sws_getGaussianVec", referenced from:
      _allocStuff in vf_sab.o
      _config in vf_smartblur.o
  "_sws_getContext", referenced from:
      _allocStuff in vf_sab.o
      _config in vf_smartblur.o
      _sws_getContextFromCmdLine in vf_mp.o
     (maybe you meant: _sws_getContextFromCmdLine)
  "_sws_freeVec", referenced from:
      _allocStuff in vf_sab.o
      _config in vf_smartblur.o
  "_sws_scaleVec", referenced from:
      _config in vf_smartblur.o
ld: symbol(s) not found for architecture x86_64

[Hanspeter Niederstrasser]

Oops. needs to be a bit more than just --disable-swscale. Here's my usual configure. I'll try to get a minimal test case.

--prefix=/usr/local/ffmpeg-git --disable-static --enable-shared --enable-gpl --enable-version3 --enable-pthreads --enable-x11grab --enable-bzlib --enable-frei0r --enable-libass --enable-libcelt --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libcdio --enable-libdirac --enable-libfreetype --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-zlib --extra-cflags='-I/sw/include -I/usr/X11/include' --extra-libs='-L/sw/lib -L/usr/X11/lib' --cc=clang

[Hanspeter Niederstrasser]

OK, this is the minimal test case:

./configure --enable-gpl --disable-swscale

When defaulting to static libraries, the linking failure is in ffprobe (same symbols as in Comment 2). When building dynamic libraries (--enable-shared), the link failure is in libavfilter.2.dylib.

[Carl Eugen Hoyos]

Patch committed, missing swscale dependency for MP-filters added, thank you for the report!