1px black added to bottom of MPEG-2 ???


	Cow Forums : Compression techniques VIEW POSTS • ADD A NEW POST • SEARCH • CHANGE FORUM

Respond to this post • Return to posts index • Read entire thread

1px black added to bottom of MPEG-2 ???
by Andy DeVries on Apr 2, 2009 at 4:46:01 pm

hi folks,

I am using squeeze to convert some 720x486 D1 avid source QT's to MPEG-2 for DG FastChannel Upload.

The resulting compressed file has a 1~ pixel horizontal bar added to the very bottom of the picture. I have done numerous tests, and from what I can tell the picture is not being shifted up OR scaled- the black bar actually goes OVER the picture - I created a comp with a 1 pixel red edge to test this and the black replaced the bottom red line! What?!

Their specs prefer 720x486, but from what I understand MPEG-2 is a 720x480 format. In Squeeze, I "force" 720x486. This is where the problem occurs. My biggest concern is that my field order would get disrupted, but from all tests thus far, they look fine. THERE'S JUST A BLACK BAR AT THE BOTTOM.

I can relay my complete squeeze settings if anyone's interested but I am quite positive the 480 vs. 486 dimension is the root of the problem.

Respond to this post • Return to posts index • Read entire thread

Current Message Thread:

1px black added to bottom of MPEG-2 ??? by Andy DeVries on Apr 2, 2009 at 4:46:01 pm
- Re: 1px black added to bottom of MPEG-2 ??? by Chris Blair on Apr 3, 2009 at 12:23:29 am
  - Re: 1px black added to bottom of MPEG-2 ??? by Andy DeVries on Apr 3, 2009 at 12:47:35 am

Note: If you are a registered user please click here to login before posting.

Your post will not be accepted if your name and email address are not registered in our database. Click here if you do not have an account.

Name

E-Mail Address

Subject

E-Mail me when someone responds

Just This Message

Entire Thread

None

Message:

Note: The following are HTML characters and may cause parts of your post to disappear if not used correctly: < > &
To include any portion of the post in your response, highlight the desired text and hit the "Q" key. Read more...

Add your message signature

Note: By clicking "Post Direct" button above, you are agreeing to the Creative Cow's Code of Conduct.