Why am I getting horizontal lines at the occasional frame.

Kumatora · Post by **Kumatora** » Sun Apr 01, 2007 6:14 pm

I notice this alot when the mouths are moving. My guess is that it's Divx. Should I go to another codec or what? Also, I've ripped all the episodes of Azumanga and doing it again would take forever.

Kariudo · Post by **Kariudo** » Sun Apr 01, 2007 6:23 pm

sounds like leftover interlacing artifacts
depending on the way you deinterlaced you may be able to go back and increase the threshold.

WC Annihilus · Post by **WC Annihilus** » Sun Apr 01, 2007 6:24 pm

Nah, more likely it's interlacing. Read more here, here, here, and here

Note: due to the word filters of the day, you'll need to change the urls for the 1st to links from video to v1deo (the actual word, not with the 1)

WC Annihilus · Post by **WC Annihilus** » Sun Apr 01, 2007 6:26 pm

Ah damn, Kariudo beat me to it

Kumatora · Post by **Kumatora** » Sun Apr 01, 2007 6:30 pm

Kariudo wrote:sounds like leftover interlacing artifacts
depending on the way you deinterlaced you may be able to go back and increase the threshold.

I'm still new to this but interlacing?

Kumatora · Post by **Kumatora** » Sun Apr 01, 2007 6:33 pm

By the way, when the videos are played in WMM, they're fine with no problem. Is it possible that I just need to increase the framerate?

Kariudo · Post by **Kariudo** » Sun Apr 01, 2007 6:35 pm

no, look at this
look at interlaced vs progressive under "the big picture"

Willen · Post by **Willen** » Sun Apr 01, 2007 9:51 pm

Kumatora wrote:By the way, when the VAHDIO are played in WMM, they're fine with no problem. Is it possible that I just need to increase the framerate?

The preview monitor in WMM will either deinterlace on playback, or resize the video in such a way that the interlacing is eliminated or reduced. Most video players will also deinterlace videos on playback (WMP, MPC, VLC, etc.). Of course, the method of deinterlacing will vary and so will the results.

Editing with interlaced footage isn't a big deal unless you do a lot of speed changes (slowdown, speedup) which may exaggerate the visibility of the interlacing. If you stay interlaced all the way through the editing chain to export, the final interlaced video can be played back as is (deinterlaced in the player on playback) or deinterlaced in post via VirtualDub(Mod) and/or AviSynth. Most of the times that I've noticed interlacing artifacts in a finished video it's usually due to improper deinterlacing (wrong field order) or encoding an interlaced video to a progressive format without performing deinterlacing in the process (essentially hard-coding the interlacing making it impossible for a player to deinterlace the obviously interlaced video).

It generally better to deinterlace footage before doing any editing for best results. Depending on the method that you use, this may mean a change in framerate. IVTC (inverse telecine) will normally change 29.97 fps video to 23.976 fps, so keep this in mind if mixing footage and/or using certain video editing software (Premiere, Magix, WMM, etc.)