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

[Dominik 'Rathann' Mierzejewski]

On Thursday, 25 January 2007 at 10:11, Luca Abeni wrote:
> 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.

Yes, it was built with --enable-swscaler. That was the main reason for
the upgrade and it caused other livna packagers quite a headache, due
to problems with vlc, kino and gstreamer. ;)

> (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)

I see.

Thanks,
R.

-- 
MPlayer developer and RPMs maintainer: http://mplayerhq.hu http://rpm.livna.org
There should be a science of discontent. People need hard times and
oppression to develop psychic muscles.
	-- from "Collected Sayings of Muad'Dib" by the Princess Irulan