R: [GRASS-dev] GRASS FFMPEG support

[marco.pasetti at alice.it]

Hi Glynn,
 
I succesfully built ffmpeg with the following configure options:
 
--enable-shared --disable-static --enable-gpl 
 
>Configure checks for the headers avcodec.h, avformat.h and swscale.h,
>for the function avcodec_init with -lavcodec (and optionally
>-lavutil), and for the function av_set_parameters with -lavformat (and
>optionally -lavutil).
 
mmm... the configure log it's long to post it here, but there's a line that may be *interesting*:
 
software scaler enabled   no
 
you say that configure checks for swscale.h ... maybe software scaler must be enabled?
 
another thing: vhook is not enabled, because it has been replaced by LibAVFilter, and because to build it I need some works around with libraries... so I would be very happy if GRASS would not need it :-) ... do you know if it is needed?
 
Many thanks for your help,
 
Marco

________________________________

Da: Glynn Clements [mailto:glynn at gclements.plus.com]
Inviato: gio 12/06/2008 7.04
A: marco.pasetti at alice.it
Cc: grass-dev at lists.osgeo.org
Oggetto: Re: [GRASS-dev] GRASS FFMPEG support




marco.pasetti at alice.it wrote:

> I'm building ffmpeg on windows through MinGW; standard build went
> succesfully, but I have some doubts: what does GRASS need to enable
> ffmpeg support in it?

You need to run configure with the --with-ffmpeg switch, and possibly
the --with-ffmpeg-includes= and/or --with-ffmpeg-libs= switches.

I would expect that you need --with-ffmpeg-includes=, as the headers
normally get installed into a subdirectory, but the headers don't
specify the subdirectory when they include each other.

> I built ffmpeg enabling shared and disabling static libraries, but
> enabling shared produces only libavutil, libavcodec and libavformat as
> DLLs, and not a ffmpeg DLL, as I roughly expected (I checked on the
> official ffmpeg web site, that's normal, there is any ffmpeg.dll
> mentioned)

That's correct (on Linux, I also have libpostproc, but that isn't
required by any of the other libraries).

Configure checks for the headers avcodec.h, avformat.h and swscale.h,
for the function avcodec_init with -lavcodec (and optionally
-lavutil), and for the function av_set_parameters with -lavformat (and
optionally -lavutil).

If using --with-ffmpeg results in configure errors, and you used any
necessary --with-ffmpeg-includes= and/or --with-ffmpeg-libs= switches,
then look in config.log for any error messages.

--
Glynn Clements <glynn at gclements.plus.com>


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