[FFmpeg-devel] Compiling with Intel Compiler

Gregoire Favre gregoire.favre
Tue Aug 26 19:57:07 CEST 2008

On Tue, Aug 26, 2008 at 03:22:54PM +0000, Carl Eugen Hoyos wrote:

Hello :-)

> You can't compile ffmpeg out of the box with icc if you enable-swscale.
> Following patch is a workaround.

Thanks you very much, with your patch I got it compiled, and I got less
glitches when watching ASTRA HD/Arte HD with vdr and xine than I got
with gcc-4.3.1 (my core 2 duo @ 2.4 GHz isn't powerfull enough to play
it, at least till both cores get fully used).

I compiled with -O3 -xT -gcc -mtune=core2 in case that's could be

(In case anyone would like to test a sample from Arte HD :
http://rapidshare.com/files/138962028/001.vdr.html but that's a
completly different story so I stop here my wrong ml email...).

> Carl Eugen
> Index: libswscale/yuv2rgb.c
> ===================================================================
> --- libswscale/yuv2rgb.c        (Revision 27482)
> +++ libswscale/yuv2rgb.c        (Arbeitskopie)
> @@ -157,6 +157,9 @@
>  // The volatile is required because gcc otherwise optimizes some writes away
>  // not knowing that these are read in the ASM block.
> +#ifdef __ICC
> +#define static
> +#endif
>  static volatile uint64_t attribute_used __attribute__((aligned(8))) b5Dither;
>  static volatile uint64_t attribute_used __attribute__((aligned(8))) g5Dither;
>  static volatile uint64_t attribute_used __attribute__((aligned(8))) g6Dither;

Gr?goire FAVRE  http://gregoire.favre.googlepages.com  http://www.gnupg.org

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