Hi Martin,

ffmpeg is an open source project; you'll probably need to compile it for your target platform.   For our QNX 6.6-based 
system we found there were no additional patches required to cross compile for QNX and get it working for our 
application - it built "out of the box" so to speak with the right configure options.

That said: if you need https support, you may also need to port gnutls, which did require a little more porting effort.

Here is a quick copy-and-paste of the configure and make lines from our Linux-based cross build system:

CC=qcc
CXX=QCC
CFLAGS="$CFLAGS -D__EXT"
CARCH="ntox86"
export AR="${CARCH}-ar"
export AS="${CARCH}-as"
export ELFEDIT="${CARCH}-elfedit"
export LD="${CARCH}-ld"
export NM="${CARCH}-nm"
export OBJDUMP="${CARCH}-objdump"
export OBJCOPY="${CARCH}-objcopy"
export RANLIB="${CARCH}-ranlib"
export SIZE="${CARCH}-size"
export STRINGS="${CARCH}-strings"
export STRIP="${CARCH}-strip"

  ./configure \
    --prefix='/usr' \
    --disable-debug \
    --disable-static \
    --disable-stripping \
    --enable-gmp \
    --enable-gnutls \
    --enable-gpl \
    --enable-shared \
    --enable-version3 \
    --enable-cross-compile \
    --cc=${CC} \
    --cxx=${CXX} \
    --ld=qcc \
    --ranlib=${RANLIB} \
    --strip=${STRIP} \
    --nm=${NM} \
    --ar=${AR} \
    --as=${AS} \
    --target-os=qnx \

make -j10


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Hope this helps some,

-Will