[Ffmpeg-devel] Bad interation of rc_strategy=1 and qprd (original) (raw)

Loren Merritt lorenm
Sun Feb 5 00:26:58 CET 2006

On Sat, 4 Feb 2006, Nico Sabbi wrote:

Michael Niedermayer wrote:

On Sat, Feb 04, 2006 at 05:47:47PM +0100, Nico Sabbi wrote:

I wanted to test how the quality of lavc's encodes would differ using xvidrc; the short answer is bad (they look much worse than with lavc's rc code), but what well, you at least have to post 1st pass, 2nd pass stats of lavc, lavc+xvidrc and xvid ... I'm not comparing the two codecs (I prefer lavc much more than xvid): I'm only encoding to lavc (mpeg2) with and without vrcstrategy=1 to see if there is any improvement. I'll post the psnr figures when I've collected them

But you should compare lavc+xvid_rc against xvid+xvid_rc, otherwise you won't know if you've accurately implemented xvid_rc.

First guess for why qprd borks: did you not set lambda appropriately? xvid's rc deals only with quantizers.

--Loren Merritt

More information about the ffmpeg-devel mailing list