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

Matthew Einhorn moiein2000 at gmail.com
Wed Jul 6 05:39:54 CEST 2011

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.


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