[Libav-user] How can i get just basic info from an input video file by ffmpeg?

[Amir Rouhi-Rmit]

In Zerano web site at http://ffmpeg.zeranoe.com/builds/ i can see two type
of 32 bits builds: Static and Shared. in description of shared build has
written:
"builds provide each library as a separate .dll file (libavcodec,
libavformat, libavfilter, libavdevice, libswscale), and small .exe files
that depend on those libraries for each program. ".
Do i have to use 32 bit build(shared) then? Or i should use static one?


On Wed, Jul 6, 2011 at 4:38 PM, Matthew Einhorn <moiein2000 at gmail.com>wrote:

> On Wed, Jul 6, 2011 at 2:16 AM, Amir Rouhi-Rmit <amir.rouhi at rmit.edu.au>
> wrote:
> > I am using DEV  C++ developer under windows. Here i cant find any .lib
> files
> > like old borland c compilers.
> > What i have done step by step is:
> >
> > Open ffmpeg.c file in DEV C++ compiler.
> > Set Include directory from tools/compiler options/ directories to
> > ffmpeg/libavcodec.
> > (There is a another setting place for libraries which i dont know i
> should
> > set it to which directory.)
> > Compile the program.
> >
> > I get some compiler error such as:
> > "Line 30 In file include c:\.......libavutil\avutil.h"
> > Whats your advice?
> >
> > On Wed, Jul 6, 2011 at 1:39 PM, Matthew Einhorn <moiein2000 at gmail.com>
> > wrote:
> >>
> >> On Tue, Jul 5, 2011 at 11:15 PM, Amir Rouhi-Rmit <
> amir.rouhi at rmit.edu.au>
> >> wrote:
> >> > Please help me, I use DEV c++ compiler in windows platform. I build a
> >> > project in this compiler and add utils.c (with al its headers and
> >> > functions)
> >> > to the project, but when i want to compile the program, it does not
> >> > recognise all the header files used in utils.c  such as #include
> >> > "avformat.h". It seems that i have a problem in including new library
> >> > files
> >> > or in linking. Even i add the libavecodec path for new header files
> >> > location
> >> > but still does not recognise them.
> >> >
> >> > On Tue, Jul 5, 2011 at 4:37 PM, Clément Bœsch <ubitux at gmail.com>
> wrote:
> >> >>
> >> >> On Tue, Jul 05, 2011 at 04:27:16PM +1000, Amir Rouhi-Rmit wrote:
> >> >> > I found dump_format() function (not av_dump_format() ) among ffmpeg
> >> >> > source
> >> >> > codes :  dump_format(ic, 0, is->filename, 0);
> >> >>
> >> >> You are not up to date then…
> >> >>
> >> >> > but i would be pleased if you let me know how can i find a tutorial
> >> >> > which
> >> >> > shows how can i use the function ? and which header should be
> >> >> > included?
> >> >> >
> >> >>
> >> >> av_dump_format() is just a printing function. It is defined in
> >> >> libavformat/utils.c. You can look into this file how where it finds
> the
> >> >> various information it prints.
> >> >>
> >> >> If you need some examples on how to use the API, look at the
> ffmpeg.c,
> >> >> ffplay.c and ffprobe.c. Also, doc/examples contains various codes
> that
> >> >> might help you.
> >> >>
> >> >> Note: please do not top post, it is considered rude.
> >> >>
> >> >> [...]
> >> >>
> >> >> --
> >> >> Clément B.
> >> >>
> >> >> _______________________________________________
> >> >> Libav-user mailing list
> >> >> Libav-user at ffmpeg.org
> >> >> http://ffmpeg.org/mailman/listinfo/libav-user
> >> >>
> >> >
> >> >
> >> >
> >> > --
> >> > Amir H. Rouhi
> >> > PhD Student/ CSIT RMIT University
> >> > Room: 14-09-04
> >> > rouhi_amirhossein at student.rmit.edu.au
> >> > amir.rouhi at rmit.edu.au
> >> >
> >> >
> >> > _______________________________________________
> >> > Libav-user mailing list
> >> > Libav-user at ffmpeg.org
> >> > http://ffmpeg.org/mailman/listinfo/libav-user
> >> >
> >> >
> >>
> >> Please don't top post.
> >>
> >> A couple of reasons why it might not work is that you have to wrap all
> >> the ffmpeg includes in a extern "C"  declaration. Also, assuming that
> >> you didn't build ffmpeg yourself, did you link dynamically or
> >> statically? And if statically, did you link to the .lib files? You
> >> should include some kind of error massage, otherwise it's hard to know
> >> what's going wrong.
> >>
> >> Matt
> >> _______________________________________________
> >> Libav-user mailing list
> >> Libav-user at ffmpeg.org
> >> http://ffmpeg.org/mailman/listinfo/libav-user
> >
> >
> >
> > --
> > Amir H. Rouhi
> > PhD Student/ CSIT RMIT University
> > Room: 14-09-04
> > rouhi_amirhossein at student.rmit.edu.au
> > amir.rouhi at rmit.edu.au
> >
> >
> > _______________________________________________
> > Libav-user mailing list
> > Libav-user at ffmpeg.org
> > http://ffmpeg.org/mailman/listinfo/libav-user
> >
> >
>
> I'm pretty sure that won't work. You cannot compile the files in c++.
> You should use one of the precompiled DLL builds (look at the download
> link on the ffmpeg page) and link to the required functions in the
> dll.This way you can call and incorporate the ffmpeg functions into
> your application. I haven't use DEV c++ however, only MSVC++.
>
> For example, the zeranoe builds will include the header files for most
> fffmpeg supported function which you could then call once you load the
> dll library dynamically, or statically if you link to the included
> .lib files (and of course you have to include the headers into your
> project).
>
> Matt
> _______________________________________________
> Libav-user mailing list
> Libav-user at ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/libav-user
>



-- 
Amir H. Rouhi
PhD Student/ CSIT RMIT University
Room: 14-09-04
rouhi_amirhossein at student.rmit.edu.au
amir.rouhi at rmit.edu.au
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