Compare x264 and x265

[mathiasb]

Hello .
i would like to have a method to compare X264 and x265.
I am tring with -qp but i ma not sure of results.

Was would be the good way to do such a thing ?
(need to write an article).

Tahnks a lot

[sneaker_ger]

Encode to the same bitrate using 2pass encoding (--pass X --bitrate Y). Then compare visually (recommended) or using a metric like PSNR or SSIM. If you want to compare metrics use --tune psnr --psnr or --tune ssim --ssim respectively. Never use --qp.

[mathiasb]

Thanks for your quick answer .

Already test this method also .
but i do not obtain same size with x264 and x265 , seems suprising .
(will try again )

have read in other news , some guy made it with -crf .
is it a good way ?

why qp not a good way to do such a thing ?

Thanks a lot , hop i will able to write my newspaper :)

[stax76]

Also take a look at recently posted comparisons like this:

http://forum.doom9.org/showthread.php?p=1716059#post1716059

5000 Kbps is roughly 5 GB per movie.

[mathiasb]

Thanks a lot..seems to work better with latest x265 from git and with latest ffmpeg from git with your method ....

thanks a lot:) :)