Sidebar Sidebar
Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.

What causes this horizontal "lag" i video? W/PIC

brendanryder

brendanryder

macrumors 6502a
Original poster
Dec 28, 2006
654
0
Calgary
so i was watching a video and noticed that whe ever there was motion going on there would be parts that looked like they suffer from lag.
from what i can see form the screen grab it looks really bad. Is this from a shooting in like 60i and then converting to 24P because it almost looks like its missing part of the image?

picture3hpv.png


I would of googled this but im not sure what it is haha

Thanks
 
Could be the video - depends where you're watching it (if it's on YouTube, for example, it could have been uploaded like that).
 
Ah - that's an interlacing artefact. That's cos it was recorded on a rubbish camcorder, edited on a ***** computer, ripped onto a DVD, uploaded to a website etc. etc. and each time its being converted and reconverted from different formats and some things think it's interlaced, others progressive and it all gets messed up.

It's not your display.
 
haha ok thanks.
So moral of the story is dont compress and recompress and export and import a bunch of times at different points?
 
suburbiton said:
Ah - that's an interlacing artefact. That's cos it was recorded on a rubbish camcorder, edited on a ***** computer, ripped onto a DVD, uploaded to a website etc. etc. and each time its being converted and reconverted from different formats and some things think it's interlaced, others progressive and it all gets messed up.

It's not your display.
Click to expand...
Playback interlaced footage on a progressive monitor (like a computer monitor) and you will always see the individual fields. It doesn't matter if you are using a $50 camera off eBay or a $50,000 camera new off the shelf. Interlaced footage is designed to be viewed on an interlaced display and, w/o de-interlacing at some point, will not playback properly on a progressive display.


Lethal
 
brendanryder said:
haha ok thanks.
So moral of the story is dont compress and recompress and export and import a bunch of times at different points?
Click to expand...

The moral of the story is that interlace video look great on an interlaced display, and progressive video looks great on a progressive display.

If, as most indi videos are, viewed on peoples computers (which have progressive displays) your interlaced material will show all its nasty artefacts. It's best to covert to progressive by de-interlacing for this purpose.

The up side is that scenes with masses of action will be artefact free.
The down side is that the resolution of you video will be trounced.

Advise: use a smart de-interlacer to preserve vertical resolution. :D
 
You must log in or register to reply here.
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.
Top Bottom
Back