How to deal with horizontal lines on the picture?

[xuguang_he]

If you look closely enough, you may notice that there are many horizontal lines on the picture, making it quite VHS-like.
May I ask how to decimiate this lines as much as possible but not to destroy the picture itself?

[jagabo]

It would be better to post a short sample of your source video, without reencoding.

[themaster1]

At first glance these look like hanovers bars but only on the luma (?) that's an odd one

[poisondeathray]

Yes , original sample video would be better

But I can suggest destripe() by *mp4guy (applied on rotated 90 degree image) is one approach for these types of situations

Original thread and more info, function
http://forum.doom9.org/showthread.php?t=154863
http://forum.doom9.org/showthread.php?p=1408276#post1408276

(this is just a suggestion for the starting point, you have to play with the settings for optimal results)

turnleft()
destripe(2,1,20)
turnright()
finesharp(sstr=0.1) #mild sharpening

[jagabo]

At first glance these look like hanovers bars but only on the luma (?) that's an odd one

They're not Hanover bars because they appear on both greyscale and color portions of the image. Hanover bars result from the chroma channels being phase shifted on alternate scan lines (it's in the name: Phase Alternating Line) so they only appear over colored portions of the image.