-
File conversion strange lines, jagged edge
I was recently converting an MPEG file to DV so I could edit with it for the news. I was finally successfull with “MPEG Streamclip” but there was a problem that I have had on several kinds of files.
Initially each time I converted the file if there was any kind of motion there would be jagged horizontal lines coming off any hard edges in the motion. Sort of like a comb look. It seems like this would be something to do with the scan lines or interlacing, but no change in settings seemed to affect it.
I get the same problem when people send VNR’s on Beta tapes. Especially if the stuff was shot on film (like the movie trailer reels we get a lot of). It looks good coming from the tape machine or over the routing system, but the final capture will have this horizontal breakup around motion. Here is a link to Jpeg with some samples: https://www.kutvfreshair.com/images/BADLines.jpg
Also had some stuff that looked good in Uncompressed 8bit, but on conversion to M4v had the same problem.
Any ideas?
DWR
-
5 Replies
-
erm…. the link only seems to work if you cut-&-paste it into your browser
DWR
-
Initially this looks like a field domninace issue. What process are you using to encode the media?
-
I think that this problem comes from how you used MPEG Streamclip.
Try this:
Open your clip in MPEG Strea,clip.
Go to the clip start.
Going frame by frame, find a piece of material that has movement. You will probably now better see the “comb effect” to which you refer. You might find, for instance, that there are two “combed” frames, followed by three normal frames. These combed frames are interlaced frames.Move forward frame by frame until you get to the end of two interlaced frames and the start of the three normal frames.
Hit “i” (in point)
Now, click in the that box on the screen called “deinterlace”.
Make your movie.
If there are still interlaced frames present when you have done this, then you should try a slightly different “i” point.
This should work.
Best
Harry.
-
Harry what do you mean by hit I in point. Thanks Fred
-
I mean hit the lower case letter “i” to create an “in” point.
Harry
Reply to this Discussion! Login or Sign Up