shaky frozen frame

defucius wrote on 9/19/2002, 2:54 PM

I used track motion to freeze a frame. It appears to be perfect until it played on TV. The frozen frame kept jumping between two apparently adjacent frames, and made the screen appear shaky. Is that a result of intelace? I had about five different frozen frames in the same clip, and only one appeared jumpy.

The clip was rendered as DVD NTSC, burned onto a CD-R as a miniDVD, and played on a Sampo DVD desktop dvd player. And it plays just fine on my computer using powerDVD.

I also tried to render it as VCD. It played fine without any problem.

Interestingly enough, I saw the same shaky screen on last night's Larry King live. Somehow, Larry King got frozen and jumpy -- quite funny.

Comments

mako wrote on 9/20/2002, 5:45 PM

Yes, shaky freeze frame images are due to interlacing. If you have a camera that has a progressive mode, you can use that to eliminate the shakes on a freeze frame. Otherwise, someone had the good idea to render the clip involved as a progressive avi file, then use that in lieu of the original. I am not sure if this works, for I myself haven't tried it, but it does sound plausible and probable. Let us know if this works for you.

BTW, I too did a freeze frame at the end of a movie recently in hommage to the end scene of Truffaut's the 400 blows. :) Goodluck.

Art

sonicboom wrote on 9/20/2002, 5:55 PM

i tried freezing a frame from velocity envelope and i got the shakes for a still
then i read in this forum that this can happen
whenever i want to FREEZE FRAME now--i take a snapshot and then edit it in
it works perfectly for me
this way you don't have to render
just take a snapshot and throw it in
hope that helps
sb

mako wrote on 9/20/2002, 5:59 PM

Great suggestion sonicboom! Just do it baby! :)

salad wrote on 9/20/2002, 6:03 PM

That's what I've been doing also SB! Works ok here!

In the cold, I freeze, & I shake. The cold will soon be here....:-(

defucius wrote on 9/20/2002, 7:22 PM

I've been searching on the creative cow forum, and found another way of doing the freeze, besides the way you mentioned here:

Zoom into to frame level view
split the frame from the clip
select and copy the frame
paste repeat (ctrl-B) the fame N times -- N is the duration of the freeze

An alternative to paste repeat is to use velocity envelop on the singled out frame.

Sounds like both should work. Any comments?

vicmilt wrote on 9/21/2002, 7:59 PM

I used a velocity envelope on the clip, added two adjacent points and dragged the velocity on the second point down to zero. I then dragged the clip to the length that I needed, and the freeze held. It's all working fine. Fast implementation, too.

Spot|DSE wrote on 9/21/2002, 10:29 PM

vicmilt, this is the correct way to do this, and to have yet a better result, right click the clip, select Properties, then check the "resample" and "reduce interlace flicker" and all will be well.

salad wrote on 9/22/2002, 2:06 PM

Thanks Guys!
Will use these techniques next time.

defucius wrote on 9/23/2002, 9:49 AM

SPOT, you are correct. I went back to the video I had problem with and turned on both resample, and reduce interlace flicks switches. And sure enough, it fixed the problem. This turns out to be the simplest of the three methods to freeze a frame.

Now my question is where is the "resample" switch for the entire project? It only shows up in quicktime and avi encoders, not in any others. The only choice is to enable it on individual clips?