[MEncoder-users] A good compromise for deinterlacing camcorder-dv-files

[Christian Ebert]

* Grozdan on Sunday, June 27, 2010 at 08:05:29 +0200
> On Sun, Jun 27, 2010 at 1:21 AM, Al Bogner
> <mencoder at ml093.pinguin.uni.cc> wrote:
>> There are so many possibilities to deinterlace a video and most times
>> deinterlacing is discussed with ripped dvds.
>> 
>> Do you have a recommendation for camcorder-videos, captured from tape
>> to dv1-format?
>> 
>> For a first try, I used this. The source ist 720x576 interlaced, 16:9
>> PAL
>> 
>> mencoder "$FILE" -fps "$FPS" -aspect "$DAR" \
>> -vf
>> yadif=0,softskip,scale=1024:576,eq2=1.15,hqdn3d,unsharp=l:5x5:0.9:c:5x5:0.1
>> \
>> -sws 9 \
>> -ovc lavc -lavcopts vcodec=ffv1 \
>> -ofps "$FPS" -nosound \
>> -o "$FFV1VIDEOFILE"
>> 
>> If I use yadif=1 I get slow motion, which I found recommended somewhere.
> 
> That's because yadif=1 is a bobber which doubles the frame rate, ie it
> outputs one frame for each field thus doubling the fps...
> If you use a bobber in mencoder, you should specify both -fps and
> -ofps that is double of the original frame rate. So if you have 25fps
> interlaced content, use yadif=1 with -fps 50 and -ofps 50.

Shouldn't that be -fps 25 -ofps 50 ? At least this worked for
me[tm], but perhaps mencoder just worked around my stupidity.

> If you have
> 29.970fps interlaced content, use yadif=1 with -fps 60000/1001 and
> -ofps 60000/1001
> 
> As Andrew recommended, you could also use the pp=lb (linear blend)
> filter but personally I find it blurs too much for my taste so if I
> had to use a deint filter from the pp, I'd got for the pp=ci one
> (cubic interpolation, gives pretty sharp images after deint)

Have to try that one. However, as _camcorder_ material often has
shaky images -- as opposed to industrial preprocessed dvd
material -- I often found the need to work around the sharpness
which resulted in sharp squares e.g. in areas that are mostly one
color but with "gradient" transitions (blue sky).

c
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