[FFmpeg-user] Video does not see when compiling ffplay using mingw

[Ignacio Gonzalez]

Thanks, I solved my problem, I was having problems with other ffmpeg
version installed in the mingw, I had to reinstall mingw and then use
-lavcodec -lsdl  ,,, etc to thake the librarys.



2012/8/27 Ignacio Gonzalez <mylaneza at gmail.com>

> Sorry, i don't explain myself very well, I want to use ffplay in java, so
> i am going to change the name of main function to "play", then i will use
> java native interface to create a dll so i can call this play function, but
> i need to create a .lib and .dll files for such a purpose.
>
> I am reading http://www.mingw.org/wiki/MSVC_and_MinGW_DLLs to create this
> static library, but it does not working, this is what I am doing:
>
> 1. I made a copy of ffplay.c and put it into J:\Nacho\Proyectos\Ffplay\.
> 2. I create ffplay.h with the declaration of
>
> int play(int argc , char **argl );
>
> 3. I modify ffplay.c main line
> ...
> int main( int argc, char **argv ) -> int play( int argc, char **argv )
> ...
>
>
> 4. I copy cmdutil.c to J:\Nacho\Proyectos\Ffplay\
>
> 5. I use this command line to create the .def file
>
> gcc -shared -o ffplaydll.dll ffplay.c cmdutils.c
> -Wl,--output-def,ffplaydll.def,--out-implib,libffplaydll.a
> -IJ:/ffmpeg/ffmpeg-0.10.4 -IJ:/SDL/SDL-1.2.15/include
>
> but this responds with a lot of errors of this kind:
>
> C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\ccvex5FS.o:cmdutils.c:(.text+0x3323):
> undefined reference to `av_mallocz'
>
> and this is where i'm stuck.
>
>
> i tried to add -LJ:/ffmpeg/ffmpeg-0.10.4/libavdevice/avdevice.lib and
> others paths but this doesn't work.
>
>
>
>
>
>
> 2012/8/27 Roger Pack <rogerdpack2 at gmail.com>
>
>> > Ok, i use "export CFLAGS=" and then configure, make and make install for
>> > SDL and then configure, make and make install for ffmpeg and the video
>> > displays fine. Thanks for your help, now i will like to modify ffplay
>> > source code and the make file so instead of an .exe file i create a .lib
>> > file, i don't know if you could help me with the makefile modification
>> or
>> > where can i read documentation about creating .lib files with mingw.
>>
>> The zeranoe builds contain a "-dev" download that I believe has .lib
>> files that can be used in association with the .dll's...
>> -r
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>
>