[Theora] trying to encode from dvd using mplayer

Ivan Popov pin at medic.chalmers.se
Thu Dec 16 07:39:01 PST 2004

On Thu, Dec 16, 2004 at 01:20:19PM +0100, David Kuehling wrote:
> > theora-encoder -va -vf -va crop=704:424,scale=528:320,hqdn3d=4:3:6 \
> > -s 64 -S 45 \ -a 0 -v 5.4 -o 528-320-5.4-0-436.ogg \ dvd://1
> Be careful with applying too heavy denoising `hqdn3d=...

[talking about a video done with heavier denoising]
> when viewing the whole movie another time, the temporal "tearing"
> introduced by the last argument to hqdn3d got more and more annoying...

Hi David,

sure it is a good suggestion.

In fact, I chose the values above (though they are mplayer hqdn3d default)
rather consciously. Bigger values create a noticeable difference in the
visual perception (in my eyes), but as above they go practically unnoticed,
while improving the bitrate by about 10%, for that particular movie.

I tested several combinations of theora quality and hqdn3d strength
and that one looks like a nice compromise for dvd.
For VHS rips one probably would prefer stronger hqdn3d,
depending on the quality of the original.


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