[FFmpeg-devel] [PATCH 4/6] dv: fix weight table for 2x4x8 transform

Reimar Döffinger Reimar.Doeffinger at gmx.de
Sat Oct 25 18:25:22 CEST 2014

On Sat, Oct 25, 2014 at 05:35:37PM +0200, Christophe Gisquet wrote:
> 2014-10-25 13:35 GMT+02:00 Reimar Döffinger <Reimar.Doeffinger at gmx.de>:
> > Could you maybe add e.g. a FATE test that clearly shows the before-after
> > improvements?
> I've tried for a small while, by swapping fields on lena and converting to
> yuv42[02]p and feeding it to ffmpeg with:
> -pix_fmt yuv422p -s 720x576 -i lena.yuv -flags ildct -vf
> "setfield=1,fieldorder=bff" -vcodec dvvideo out.dv
> The PSNR results were weird (with 2 exes I thought were before/after), so I
> didn't follow through. Maybe someone more versed in libavfi can offer a
> command-line doing the job.
> The only conclusive impact is on the #2970 sequence, but it has too few
> blocks coded as interlaced (!) to matter for anything but visual. And
> indeed the fate tests do not seem to exercise the affected code.

Maybe I misunderstand the issue, but maybe a encoder option
to force interlaced encoding would work to trigger this reliably?

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