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

[Grozdan]

On Sun, Jun 27, 2010 at 10:57 AM, Christian Ebert <blacktrash at gmx.net> wrote:
> * 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 it works, use it. -fps 50 and -ofps 50 also works (and is highly
recommended when using the tfields filter which is very similar to
what yadif=1 does in the sense that it outputs for each field a frame,
doubling the fps as yadif=1 does)

>
>> 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).

There's no deshaker filter yet in mplayer so I can't help on that and
I don't deal with shaky stuff at all

>
> c
> --
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