Re: Getting an image into octave from web-camera?

[Philip Nienhuis]

Davinder Kaur wrote
> I am sorry.
> 
> 
> I'm following these
> steps(https://gist.github.com/xdamman/e4f713c8cd1a389a5917) to install
> ffmpeg and got this warning-
> 
> PC:~/x264$ ./configure --enable-static Warning: AV_PIX_FMT_FLAG_RGB is
> missing from libavutil, update for swscale support
> platform:      X86_64
> system:        LINUX
> cli:           yes
> libx264:       internal
> shared:        no
> static:        yes
> asm:           yes
> interlaced:    yes
> avs:           avxsynth
> lavf:          no
> ffms:          no
> mp4:           gpac
> gpl:           yes
> thread:        posix
> opencl:        yes
> filters:       crop select_every 
> debug:         no
> gprof:         no
> strip:         no
> PIC:           no
> bit depth:     8
> chroma format: all
> 
> You can run 'make' or 'make fprofiled' now.

OK a few more hints.
I can only vouch for (.rpm-based) Mageia-4 and Octave-4.1.0+ (development
version). 
Note that the pic stuff and arch is required for me as I have 64-bit Linux.
For 32-bit it isn't required I think.

Downloaded and unpacked ffmpeg-2.7.1.
In another (build) directory did:
/full/path/to/unpacked/ffmpeg-2.7.1/configure <several codec/demux options>
--enable-arch-x86_64 --enable-pic --enable-shared --prefix=/usr

In the unpacked ffmpeg source tree, I edited the root"common.mak" and added
-fPIC to CFLAGS and CPPFLAGS.

In the build dir, ran make -5 (core i5) & sudo make install

Next, I unpacked the github video source archive
("....-blah-blah-master.zip") and targz-ed it to video.tar.gz.
Oh yes I commented out the OCTAVE_ALLOCATOR macros and settings in
oct-avifile.h and (IIRC) avifile.cc - you'll see the error mesages in Octave
to guide you which files it were.

In Octave I did:
more off
pkg install -verbose video.tar.gz

...and the rest is in my previous post. In the end when building the docs,
pkg complained it couldn't find libavformatl.so.56 (or something like that),
a symlink that *does* point to a similarly named .so in /usr/lib.  It may
have to do with the configure prefix stuff, I don't know.
Maybe I can have another try tonight but I have a family life as well.....

Philip



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