Interlacing lines in Compressor

[David Roth weiss]

Don’t sweat the interlace while viewing in compressor, no one will see that but you. In terms of things you encode gor the Web, the rule of thumb is, deinterlace everything that will be viewed at greater than 50% of the original pixel dimension. At 50 or less the interlace essentially becomes indistiguishable.

David Roth Weiss
Director/Editor
David Weiss Productions, Inc.
Los Angeles

POST-PRODUCTION WITHOUT THE USUAL INSANITY ™

A forum host of Creative COW’s Apple Final Cut Pro, Business & Marketing, and Indie Film & Documentary forums.

[Martin Zinkel]

Thanks David,

For comparison, I am doing a batch in Compressor right now going from a self-contained DV Anamorphic QT to
1) Deinterlaced using frame controls
2) Deinterlaced using the deinterlace filter
3) Nothing altered
I’m not resizing. I will post my results.

Is the reason I’m seeing the interlacing in the Compressor viewer the same reason that I always see interlacing when playing back an mpeg2 file ripped from DVD in mpeg streamclip?
Something having to do with viewing interlaced footage on a computer screen, right?

And for good measure…when is the best time to deinterlace the above mentioned mpeg2 files for editing? Before editing or after picture lock?

I appreciate the help David and all!

24″ iMac 3.06GHz 4GB RAM

[Sean Oneil]

[David Roth Weiss] “At 50 or less the interlace essentially becomes indistiguishable.”

It’s not that it becomes indistinguishable, it’s that the compressor generally throws away one of the fields since it’s going to be half-size or less anyways.

Sean

[David Roth weiss]

[Martin Zinkel] “Is the reason I’m seeing the interlacing in the Compressor viewer the same reason that I always see interlacing when playing back an mpeg2 file ripped from DVD in mpeg streamclip?
Something having to do with viewing interlaced footage on a computer screen, right? “

Yes, and the better your computer monitor the more likely you are to see the interlace.

[Martin Zinkel] “when is the best time to deinterlace the above mentioned mpeg2 files for editing? Before editing or after picture lock? “

Well, you wouldn’t want to deinterlace for normal editing or for a DVD, etc., only for a large Web video, so don’t ever deinterlace until you have a very good reason to do so.

David Roth Weiss
Director/Editor
David Weiss Productions, Inc.
Los Angeles

POST-PRODUCTION WITHOUT THE USUAL INSANITY ™

A forum host of Creative COW’s Apple Final Cut Pro, Business & Marketing, and Indie Film & Documentary forums.

[David Roth weiss]

[Sean ONeil] “It’s not that it becomes indistinguishable, it’s that the compressor generally throws away one of the fields since it’s going to be half-size or less anyways.”

Sean,

Since I’ve never personally examined the garbage can into which Compressor throws away those fields you mention, all that kind of remains a mystery to me. So, I choose to use language such as “indistinguishable” cuz I don’t really know exactly how the magic happens, I just know it does…

David Roth Weiss
Director/Editor
David Weiss Productions, Inc.
Los Angeles

POST-PRODUCTION WITHOUT THE USUAL INSANITY ™

A forum host of Creative COW’s Apple Final Cut Pro, Business & Marketing, and Indie Film & Documentary forums.

[Sean Oneil]

What you said sounded to me like it was still there but too small to distinguish. Thought you’d like to know that it isn’t there at all.

Sean