Akode and FFmpeg

Dan Nicholson dbn.lists at gmail.com
Tue Aug 14 15:43:45 PDT 2007

On 8/14/07, M.Canales.es <macana at macana-es.com> wrote:

> /bin/sh ../../../libtool --silent --tag=CXX --mode=link g++  -Wno-long-long
> -Wundef -ansi -D_XOPEN_SOURCE=500 -D_BSD_SOURCE -Wcast-align
> -Wchar-subscripts -Wall -W -Wpointer-arith -DNDEBUG -DNO_DEBUG -O2
> -Wformat-security -Wmissing-format-attribute -Wno-non-virtual-dtor
> -fno-exceptions -fno-check-new -fno-common    -o libakode_ffmpeg_decoder.la
> -rpath /opt/kde-3.5.6/lib -avoid-version -no-undefined -Wl,--no-undefined
> -Wl,--allow-shlib-undefined   ffmpeg_decoder.lo ../../lib/libakode.la
> -lavcodec -lz -la52 -lmp3lame -lm -ldl -lX11 -lXext -lavutil   -lavformat
> -lavcodec -lz -la52 -lmp3lame -lm -ldl -lX11 -lXext -lavutil
> .libs/ffmpeg_decoder.o: In function `aKode::FFMPEGDecoder::seek(long)':
> ffmpeg_decoder.cpp:(.text+0x39a): undefined reference to
> `av_seek_frame(AVFormatContext*, int, long long, int)'
> .libs/ffmpeg_decoder.o: In function
> `aKode::FFMPEGDecoder::FFMPEGDecoder(aKode::File*)':

Well, it looks like it's trying to get the linker to not barf on
undefined symbols with -Wl,--allow-shlib-undefined, but maybe I don't
understand that option correctly. Anyway, in my ffmpeg from 20070128,
libavformat has av_seek_frame, and it looks like ffmpeg_decoder.o is
getting linked with -lavformat. Maybe you can check on yours.

$ grep -r av_seek_frame /usr/include/ffmpeg/
/usr/include/ffmpeg/avformat.h:    /* av_seek_frame() support */
/usr/include/ffmpeg/avformat.h:    /* av_seek_frame() support */
/usr/include/ffmpeg/avformat.h:int av_seek_frame(AVFormatContext *s,
int stream_index, int64_t timestamp, int flags);
av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t
target_ts, int flags);
$ nm /usr/lib/libavformat.so | grep av_seek_frame
0001bdc0 T av_seek_frame
000191e0 T av_seek_frame_binary


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