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| Unofficial VirtualDub Support Forums > Advanced Video Processing > Fixing Badly Interlaced Divx |
| Posted by: stein Feb 18 2003, 10:27 AM |
| Hi! I got a divx movie, that has some ugly inrterlacing artefacts. After a closer look I discovered the following : - it is 688x544 at 25 fps - there is a pattern of behavior that repeats every 12 frames. For further discussion I will use the names "frame 1" to "frame 12" to refer to a particular frame in this repeating sequence ( the movie picture does not repeat, only some of the properties of those frames ) : - frames 11 and twelve are always the same ( except for divx compression artefacts ) - every frame is made up of two fields, that were not taken at the same moment, so there is an ugly comb effect. - one field of a frame is from the same moment of time as one field from the following frame, except frames 8 and 9 , that have no "common" part - if I could split the fields of all frames and then put them together like this : from : [ 1a 1b ] ( this is one original frame, "a" and "b" are the fields ) [ 2a 2b ] [ 3a 3b ] [ 4a 4b ] to : [ 1b 2a ] [ 2b 3a ] [ 3b 4a ] then I would ( I assume ) get a picture with no interlace effect. ( frames 8 and 9 would require special treatment tho ) In virtualdub I managed to split the movie into two parts by using the deinterlace filter ( unfold side-by-side ) and crop. Now I have two avi files , one has the even lines of original, the other the odd lines. How can I put them back tigether , correctly ? How do I delete each 12th frame ( to get rid of the duplicates ) ? TIA, stein |