linux x86_64:

bilboed@pitivisink ~/work/cvs/gst-ffmpeg $ nm gst-libs/ext/ffmpeg/libavformat/.libs/libavformat.a | grep -i pcm_read
0000000000000750 T pcm_read_seek
                 U pcm_read_seek
                 U pcm_read_seek
                 U pcm_read_seek
                 U pcm_read_seek
                 U pcm_read_seek

bilboed@pitivisink ~/work/cvs/gst-ffmpeg $ nm ext/ffmpeg/.libs/libgstffmpeg.so | grep -i pcm_read
0000000000046de0 t pcm_read_seek


MacOSX i386:

fluendos-computer:~/gst/uninstalled/gst-ffmpeg fluendo$ nm gst-libs/ext/ffmpeg/libavformat/.libs/libavformat.a | grep -i pcm_read
00000282 T _pcm_read_seek
         U _pcm_read_seek
         U _pcm_read_seek
         U _pcm_read_seek
         U _pcm_read_seek
         U _pcm_read_seek

fluendos-computer:~/gst/uninstalled/gst-ffmpeg fluendo$ nm ext/ffmpeg/.libs/libgstffmpeg.so | grep -i pcm_read
         U _pcm_read_seek