[x264-devel] Re: Sparc optimization (8x8 SAD) & test sequences

[Guillaume POIRIER]

Hello,

On 7/18/05, Phil Jensen <philj at csufresno.edu> wrote:
> Tuukka Toivonen wrote:
> 
> >What about
> >   dd if=/dev/urandom of=random-176x144.yuv bs=38016 count=100
> >Encode it with and without VIS and see if the results are identical.
> >Actually you need to modify the original x264 as well (just add a comment
> >somewhere) otherwise the bitstream headers differ by one byte.
> >
> >Solaris probably doesn't have /dev/urandom, but I think you got the
> >idea: just generate random data and cmp the results.
> >
> >Here are some real test videos:
> >http://media.xiph.org/video/derf/
> >but you need to convert the y4m files to yuv with
> >mencoder or something. Or Google for the yuv versions.

> Thanks Tuukka,
> 
> My first attempt with mencoder was not good, and that was the test file
> I was using for my tests.  Once I got everything working, the PSNR for
> both versions of the file were identical, and looked the same (though
> quite mangled).

You need to make sure both the optimized and non-optimized version
produce a bit-identical result. Maybe "diff" can do the trick,
otherwise, just compare the mdsum of both files.


Guillaume

-- 
A lie gets halfway around the world before the truth has a chance to
get its pants on.
 -- Winston Churchill

-- 
This is the x264-devel mailing-list
To unsubscribe, go to: http://developers.videolan.org/lists.html