Missing and trailing pixels
by Ignacio Triana
on
May 11, 2008 at 9:16:54 pm
Hi everyone. I'm hoping someone could help me figure out why these images are "breaking up" when played from the timeline. They are mov files captured in FCP 5.1.4 and then exported into After Effects 6.0 using Quicktime conversion.
The clip plays smoothly without loss from the project window but when played from the timeline pixelation occurs. Also, when exported back into FCP the image trails and appears pixelated. If anyone can help it would be greatly appreciated! Thanks in advance.
Re: Missing and trailing pixels by Joey Foreman on May 12, 2008 at 12:15:12 am
What codec did you use to export the file? Really there's no need to use Quicktime Conversion. You should just use Export > Quicktime Movie, using Current Settings.
It looks like a lossy codec was used.
Joey Foreman
Editor/Animator
Nowhere Productions, Athens, GA
Re: Missing and trailing pixels by Ignacio Triana on May 12, 2008 at 1:16:45 am
Thanks Joey. I'm trying to find the original FCP file and retrace my steps-- I use the same codec for every export which is the Animation preset. The mystery is that I don't get loss on every file-- it happens seemingly sporadically. But I'm going to try it again the way you suggested. Thanks a lot!! I'll repost after I try it out.
Re: Missing and trailing pixels by Ignacio Triana on May 12, 2008 at 3:01:16 am
It seems to work with the new footage, but as I've noticed the breakage occurs so randomly it will be hard to tell for sure if the 'new' export method works until I've located the original (broken) FCP clips created for AfterFX and re-export. Thanks again!!
Re: Missing and trailing pixels by Dave LaRonde on May 12, 2008 at 3:42:03 pm
It looks like the footage might be 16x9, which means it might be HDV, which means......
Dave's Stock Answer #1:
If the footage you imported into AE is any kind of the following -- Native HDV, MPEG1, MPEG2, mp4, m2t, H.261 or H.264 -- you need to convert it to a different codec.
These kinds of footage use temporal, or interframe compression. They have keyframes at regular intervals, containing complete frame information. However, the frames in between do NOT have complete information. Interframe codecs toss out duplicated information.
In order to maintain peak rendering efficiency, AE needs complete information for each and every frame. But because these kinds of footage contain only partial information, AE freaks out, resulting in a wide variety of problems.
Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA
