Just tested this on a broadcast monitor by adding a big diagonal line across some upper-field HD footage. Exported as QuickTime ProRes upper-field, which I them imported into Premiere and played back: smooth motion and no aliasing while interpreted as upper-field. When I switched the interpretation to lower-field, I got all the horrible shuddering from fields being played in the wrong order, but the static diagonal line showed no aliasing at all.
I would say your assumption about fields being re-positioned is wrong. When someone mis-interprets upper-field-first footage as lower-field-first, they just get the fields played in the wrong order. That's it. No re-positioning. Just (in this case) the lower field played first, then the upper field.I would have thought that to take the upper field and shift it down a line to the lower field position and vice versa would be quite a deliberate process. I can't right now think of a way to *accidentally* tell the system to actually reposition the fields like this (though since there generally tends to be a way to easily screw anything up, I don't doubt that it can be done with a single bad keystroke...).
D.
On 9 November 2015 at 01:24, bigfish@pacbell.net [Avid-L2] <Avid-L2@yahoogroups.com> wrote:
If the fields are in reverse order then they are not playing in the same field the are intended for. Think of a diagonal line. I am assuming that with wrong field order Field 2 plays first and is positioned on the lines intended for Field 1 and Field 1 plays second in the lines intended for Field 2. That would mean the horizontal scan lines are inverted too. To me that would create the stair stepping even on a static frame.
__._,_.___
Posted by: David Ross <speckydave@gmail.com>
| Reply via web post | • | Reply to sender | • | Reply to group | • | Start a New Topic | • | Messages in this topic (28) |
this is the Avid-L2
.
__,_._,___
No comments:
Post a Comment