[Ffmpeg-devel] Differences between mencoder andffmpegwhenencoding using x264 (original) (raw)

Michael Niedermayer michaelni
Mon Feb 20 16:34:40 CET 2006

Hi

On Mon, Feb 20, 2006 at 04:06:09PM +0100, Luca Abeni wrote:

Hi all,

On Mon, 2006-02-20 at 09:53 +0100, Luca Abeni wrote: [...] > > My recommendation for anyone using x264 in FFmpeg would be to check the x264 > > command line defaults and explicitly specify all parameters to FFmpeg using > > the defaults from the x264 CLI and whatever alterations one may want to make. > I tried to do that, but I got lost :( > I think the problem could be related to the rate control settings, but I > am not sure. Ok, I think I tracked down part of the problem: it seems that the deblocking filter is involved (in ffmpeg, it is disabled by default. In mencoder and in the x264 CLI, it is enabled). Adding the "-loop" option to ffmpeg, the quality improves a lot (BTW: are "loop filter" and "deblocking filter" the same thing?).

strictly speaking no deblocking filter removes blocks loop filter performs some filter operation in the motion compensation loop

so some postprocessing filters may be deblock filters but never loop filters

what h264 and h263 have are deblocking-loop filters ... mpeg4 asp has neither, but you can of course do anyting with the final output like passing it through a deblock-postprocess filter

everything clear? or did i successfully confused you?

[...]

-- Michael

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