[Ffmpeg-devel] [BUG?] missing symbols in shared libavcodec build

[Luca Abeni]

Hi Dominik,

On Thu, 2007-01-25 at 02:22 +0100, Dominik 'Rathann' Mierzejewski wrote:
[...]
> ffmpeg 0.4.9-0.34.20061214.lvn7 is missing some symbols, breaking gstreamer-ffmpeg.
> 
> With ffmpeg-0.4.9-0.25.20061030.lvn6.i386.rpm installed
> "[hans at localhost ~]$ objdump -T /usr/lib/libavcodec.so | grep img_" gives:
> 000face0 g    DF .text  000000aa  Base        img_crop
> 00141630 g    DF .text  00000185  Base        img_resample_full_init
> 001417c0 g    DF .text  00000068  Base        img_resample_init
> 000fad90 g    DF .text  000001b7  Base        img_get_alpha_info
> 00140c20 g    DF .text  00000025  Base        img_resample_close
> 000fd7d0 g    DF .text  00000291  Base        img_pad
> 000fb8f0 g    DF .text  00000752  Base        img_convert
> 00140c90 g    DF .text  000006d7  Base        img_resample
> 000fb0e0 g    DF .text  00000046  Base        ff_img_copy_plane
> 000fb130 g    DF .text  00000181  Base        img_copy
> 
> With ffmpeg-0.4.9-0.34.20061214.lvn7 installed
> "[hans at localhost ~]$ objdump -T /usr/lib/libavcodec.so | grep img_" gives:
> [hans at localhost ~]$ objdump -T /usr/lib/libavcodec.so | grep img_
> 00107180 g    DF .text  000000aa  Base        img_crop
> 001061e0 g    DF .text  00000139  Base        img_get_alpha_info
> 00106ee0 g    DF .text  00000291  Base        img_pad
> 001064b0 g    DF .text  00000046  Base        ff_img_copy_plane
> 00106500 g    DF .text  00000181  Base        img_copy
[...]
Just a wild guess: how has ffmpeg been configured? If
"--enable-swscaler" is used, then the img_convert and img_resample
related code is not compiled, and sws_* functions have to be used
instead.
(note that sws_* functions can be used even if ffmpeg is not compiled
with "--enable-swscaler" - in this case, they will be emulated using the
old code)


			Luca
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