How to configue libvpx for mingw

[YIRAN LI]

Hi friends,

I am building libvpx on mingw for windows and want to use it together with ffmpeg.

I've downloaded libvpx-v1.1.0 source code. and did a simple configure: ./configure --prefix=/mingw

and build failed because of undefined reference to '_imp__pthread_once' 

Could any one tell me how to correctly configure that? I'm building on Windows with MinGW and 

I want to generate dll so that I can build it into FFmpeg (also on Windows),

Thanks! 

[Johann Koenig]

On Sat, May 11, 2013 at 10:59 PM, YIRAN LI <mrfun...@gmail.com> wrote:
> I am building libvpx on mingw for windows and want to use it together with
> ffmpeg.
>
> I've downloaded libvpx-v1.1.0 source code. and did a simple configure:
> ./configure --prefix=/mingw
> and build failed because of undefined reference to '_imp__pthread_once'

I believe this is fixed in v1.2.0
https://gerrit.chromium.org/gerrit/#/c/33908/

However we don't have a tarball for v1.2.0 posted.

You can get it with:
$ git clone http://git.chromium.org/webm/libvpx.git
$ cd libvpx
$ git checkout v1.2.0

[YIRAN LI]

Thanks Koenig,

Yes I got the latest code using git. and configured with --disable-multithread. But I still met a 'Bad file number' error.

[STRIP] libvpx.a < libvpx_g.a

/bin/sh: /mingw/bin/strip: Bad file number

make[1]: ***[libvpx.a] Error 126

make: ***[.DEFAULT] Error 2

I copied libvpx_g.a to libvpx.a and make again, and finally build succeeded.

2013/5/13 Johann Koenig <johann...@google.com>

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[Johann Koenig]

On Sun, May 12, 2013 at 11:53 PM, YIRAN LI <mrfun...@gmail.com> wrote:
> Yes I got the latest code using git. and configured with
> --disable-multithread. But I still met a 'Bad file number' error.
>
> [STRIP] libvpx.a < libvpx_g.a
> /bin/sh: /mingw/bin/strip: Bad file number

That's strange. MSDN suggests that "Bad file number" relates to file
permissions:
http://msdn.microsoft.com/en-us/library/ms832230.aspx

If you can reproduce, please check the permissions on the file (we may
not be setting it correctly) and try to run 'strip' manually. You can
check the command line by running 'make V=1'

[YIRAN LI]

Hi Johann,

Here I have some questions maybe you can help with.

I'm building ffmpeg with libvpx enabled. I've downloaded libvpx and built succeeded. ffmpeg.exe can convert video into webm format.

And I can programmatically use VP8 encoder in my program via opening AVCODE_ID_VP8 encoder and then do video conversion, everything is ok

And then I'd like to know, what's that ffmpeg patch used for?  Here you have a patch for ffmpeg 0.6.3 https://code.google.com/p/webm/downloads/list

I never applied it and everything works fine. In what circumstance do I need it? Can I apply it to latest ffmpeg version?

Great thanks! 

[Lou Quillio]

On Mon, May 20, 2013 at 1:55 AM, YIRAN LI <mrfun...@gmail.com> wrote:

> And then I'd like to know, what's that ffmpeg patch used for? Here you have
> a patch for ffmpeg 0.6.3 https://code.google.com/p/webm/downloads/list

That's deprecated. I'll take it down and substitute this link:

https://sites.google.com/a/webmproject.org/wiki/ffmpeg/building-with-libvpx

LQ


--
Lou Quillio
Webmaster, WebMProject.org

[Frank Galligan]

Awesome job on the ffmpeg guide!