Why can does it look like my edited footage is composed of blocks? at DVinfo.net

James A. Davis · October 12th, 2006, 10:22 AM

I did some color correction and also some 60i to 24p conversion and I can see blocks/lines in the footage now. You can only notice if you look real hard. Why is that? This happens with various programs. Is it how the softwares process the footage? Anyone know what I mean?

Emre Safak · October 12th, 2006, 10:44 AM

It might be artifacting related to chroma subsampling. Try using uncompressed intermediates.

Glenn Chan · October 12th, 2006, 02:04 PM

Chroma blur may help. Perhaps more so than using uncompressed intermediates (although it depends what codecs you're using to generate the "uncompressed" intermediate, and whether it's no codec or a 4:2:2 codec).

What program are you using?

2- Can you post a picture? Maybe you are talking about something else like interlacing artifacts.

October 12th, 2006, 10:22 AM	#1
James A. Davis Regular Crew Join Date: Dec 2004 Location: Philadelphia, PA Posts: 90	Why can does it look like my edited footage is composed of blocks? I did some color correction and also some 60i to 24p conversion and I can see blocks/lines in the footage now. You can only notice if you look real hard. Why is that? This happens with various programs. Is it how the softwares process the footage? Anyone know what I mean?

October 12th, 2006, 10:44 AM	#2
Emre Safak Trustee Join Date: Feb 2004 Location: Brookline, MA Posts: 1,447	It might be artifacting related to chroma subsampling. Try using uncompressed intermediates.

October 12th, 2006, 02:04 PM	#3
Glenn Chan Inner Circle Join Date: Jun 2003 Location: Toronto, Canada Posts: 4,750	Chroma blur may help. Perhaps more so than using uncompressed intermediates (although it depends what codecs you're using to generate the "uncompressed" intermediate, and whether it's no codec or a 4:2:2 codec). What program are you using? 2- Can you post a picture? Maybe you are talking about something else like interlacing artifacts.