Deinterlace Your Online Videos

Posted on November 12th, 2008 by


Deinterlace your videos!

Here are FOUR simple steps to remove interlacing when you export your videos in Quicktime Pro, iMovie HD, iMovie ’08, or Final Cut Pro.

****See original size****

1. File > Export

2. If you want this to be DEAD SIMPLE choose ‘Movie to Apple TV‘ (.m4v – playable on iPod, Zune, any computer, uploads to Viddler). DONE. If you need a Quicktime MOV, then choose ‘Movie to Quicktime Movie’ and move on to Step 3.

3. Choose ‘Size…’ (The last dialog box will open.) — You can find more information about tweaking window 3 here.

4. Tick ‘Deinterlace Source Video’.

Giddy up!

Want to learn WHY you should deinterlace your videos before you put them online? Okie dokie!

(I will use NTSC (30fps / 525 interlaced lines) as an example because most online video is played at 30fps. Discover PAL here.)

Back in the days of (analog) television, video was interlaced (a technique to improve the picture quality of a video signal primarily on CRT devices without consuming extra bandwidth). This meant your television alternated between odd and even lines of light beaming out of the monitor 30 times every second. It moves so fast our eyes can’t even tell. Sweet!

Technology has changed though. First there was HD 1080i (i = interlaced), then that was superseded by HD 1080p (p = progressive). Progressive scan is a method for displaying, storing or transmitting moving images in which all the lines of each frame are drawn in sequence. First being a low quality image and progressively improving. Remember, this all happens at 30 frames per second.


This animation shows the difference between progressive and interlaced video.

Web video is progressive. If you upload a video that has been interlaced, then it won’t display properly and you’ll end up with video that looks like Justine’s My new show on Pluggedin! or Lisa’s Mostly Madonna.

Note: I know Justine and Lisa are both very experienced in video production, so I assume it was the companies that they each work for that exported as interlaced (who knows why…) and the girls just uploaded *that* file to the web.

Go deinterlace your video now and put it on Viddler.

Update! Here’s a list of programs (thanks to Miro’s blog) that can deinterlace video on Windows operating systems:
Editing Suites:
Adobe Premiere (Windows, Mac ~ $$$)
Sony Vegas (Windows ~ $$$)
Windows Movie Maker (free)

Video Processing Application Guides/Tutorials/Manuals:
VirtualDub (Windows ~ free; open source)
MPEG Streamclip (Windows, Mac ~ free)
mencoder (Linux ~ free; open source)
FFmpeg (Linux ~ free; open source)
VLC (Windows, Mac, Linux ~ free; open source)

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    Nice post Derek. I remember when you were talking about this in Podcamp.
    Cheers.

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    No love for us PC folks? :-)

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    John,

    Dean Jansen, from Miro, has a good post here that mentions Windows alternatives. I've also added this list to the bottom of my post. :)

    Giddy.

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    Great Tip! But in iMovie '08, you need to do share –>Export Using Quicktime. Trying this now, can't wait to see the results!

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    This is simply GREAT!
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    Would be great to deinterlace my videos, thanks for your post.

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    Adobe Media Encoder, select the “deinterlace” option on the output tab and give the video 50 frames per second. Adobe then converts every field into a frame, as there are 2 fields per second you need 50 frames per second for a 25fps video. So in essence, you get a 50 “fake” progressive fps video instead of the usual 25 interlaced. The result of such a process is very smooth video, just as smooth as the source.

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    i didnt know that about 1080i, i thought 1080p was the same thing.