skullmunky
May 3rd, 2009, 10:46 PM
I've always wanted to learn how to use ffmpeg in my own code. I found this wonderful tutorial(http://www.dranger.com/ffmpeg/tutorial01.html, but I can't get any of the linking to work. I get a spew of errors such as
undefined reference to `av_freep'
undefined reference to `av_mallocz'
undefined reference to `av_log'
etc. which obviously means it's not linking correctly.
the compile command looks like this:
gcc -o tutorial05 tutorial05.c -lavformat -lavcodec -lavutil -lm -lswscale -lz `sdl-config --cflags --libs`
whenever anyone has this problem, the advice is always to link to libavformat first. So something must be wrong with that step, I imagine.
I'm on 8.04 with an ffmpeg built from SVN, following the excellent guide on the forums here on building ffmpeg with H.264.
I went hunting for libavformat, here's what locate found for me:
/usr/lib/libavformat.so.1d
/usr/lib/libavformat.so.1d.51.10.0
/usr/local/lib/libavformat.a
as well as many others scattered amongst various src folders for different things, but I these should be the only ones in my path.
undefined reference to `av_freep'
undefined reference to `av_mallocz'
undefined reference to `av_log'
etc. which obviously means it's not linking correctly.
the compile command looks like this:
gcc -o tutorial05 tutorial05.c -lavformat -lavcodec -lavutil -lm -lswscale -lz `sdl-config --cflags --libs`
whenever anyone has this problem, the advice is always to link to libavformat first. So something must be wrong with that step, I imagine.
I'm on 8.04 with an ffmpeg built from SVN, following the excellent guide on the forums here on building ffmpeg with H.264.
I went hunting for libavformat, here's what locate found for me:
/usr/lib/libavformat.so.1d
/usr/lib/libavformat.so.1d.51.10.0
/usr/local/lib/libavformat.a
as well as many others scattered amongst various src folders for different things, but I these should be the only ones in my path.