Alexander, I don't fully understand your problems.
Mixing MS VisualStudio and stuff compiled with another toolset can be
trouble. I have the feeling that all the things you describe have a
mixture of our tools and MS's.
Can you avoid such mixture, and see if you still have problems ?
Danny
On Sat, 2007-06-16 at 16:57 +0300, Alexander Zubko wrote:
> Hi.
>
> I've been fighting to make and use ffmpeg for nearly a month. As I see
> there was some guys with same problem in nearest past. But there is no
> even smallest manual about this.
>
> I was successful to build it in MSVisualStudio with its native
> compiler. But because I need to enable arm asm optimizations that
> ffmpeg has, I need to build it normaly using your mingw32ce
> toolchain.
>
> But because I'm totally new in *nix programming tools, all my steps
> are like man in totaly dark room. So I'm asking for your help, people.
>
> Here are my results for now.
>
> 1. I have successfully buit ffmpeg source files using MS Visual Studio
> and mingw32ce compiler which relative path is
> mingw32ce/bin/arm-wince-mingw32ce-gcc.exe. But had an access violation
> error in function ff_h263_decode_init() which is called from
> avcodec_open().
>
> This error is very interesting: function ff_h263_decode_init() demands
> a pointer to structure (AVCodecContext *avctx), because it needs
> another pointer from this structure (MpegEncContext *s =
> avctx->priv_data), access violation comes in the first assignment
> operation (s->avctx = avctx), so I think this means that
> avctx->priv_data is broken and points to wrong address. But, in
> function avcodec_open() it points to normally allocated memory array.
> And if I change ff_h263_decode_init() declaration to
> ff_h263_decode_init( AVCodecContext*, void* ) and pass explicitly
> avctx->priv_data as second parameter - function ff_h263_decode_init()
> does its job without any access violations.
>
> 2. By second step, I've built ffmpeg under msys/mingw using mingw32ce
> toolchain and binary files of mingw32ce downloaded form SourceFourge
> mingw32ce-0.10.0.20070208-cygwin.tar.gz and dll libraries of cygwin to
> provide running of mingw32ce tools. I've used next command line
> parameters to configure it
>
> ./configure --cross-compile
> --cross-prefix=/opt/mingw32ce/arm-wince-mingw32ce/bin/ --enable-gpl
> --disable-armv5te --disable-armv6 --disable-iwmmxt --disable-debug
> --arch=armv4l --enable-static --disable-shared --disable-ipv6
> --prefix=/usr/local/wince --log=no --disable-encoders
> --disable-decoders --disable-parsers --disable-muxers
> --disable-demuxers --disable-protocols --disable-ffplay
> --disable-ffserver --disable-ffmpeg --disable-network
> --enable-decoder=mpeg4 --enable-decoder=h263 --enable-parser=h263
> --enable-parser=mpeg4video --disable-opts --enable-memalign-hack
>
> then
> make
>
> and then grabbed .a files, and linked them to MSVC project, but for my
> dissapointment I've got the same access violation error as i had with
> the 1st try. :(
> also I linked with
> "opt/mingw32ce/lib/gcc/arm-wince-mingw32ce/4.1.0/libgcc.a" and
> "opt/mingw32ce/arm-wince-mingw32ce/lib/libmingwex.a".
>
> I don't know maybe I've choosed wrong libraries, or used wrong
> compiller, as there are two bin folders in mingw32ce folder, and what
> is the difference between them I don't know.
>
> 3. Then after two fails with mingw32ce I tried to build ffmpeg with
> cegcc toolchain.
> I've used the same configure string except
> --cross-prefix=/opt/cegcc/bin/arm-wince-cegcc- and
> Compilation was done successfully, but in MS Visual Studio I get
> constantly stack overflow error even before WinMain call ( I got it
> earlier with mingw32ce, when I choosed wrong libraries to link with)
> But now I tried different combination of libraies and it did not
> helped me.
>
> Can you wrote with what libraries I must link in MS Visual Studio if I
> has following unressolved symbols:
> snprintf, __divsi3 and other mathematical operations and functions,
> __ctype_ptr?
>
> Thank in advance.
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--
Danny Backx ; danny.backx - at - scarlet.be ; http://danny.backx.info
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