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stuttering image when exporting mts from AE

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geoff swartz
stuttering image when exporting mts from AE
on Mar 30, 2010 at 9:01:19 pm

I have a panasonic AG-HMC150 and imported a clip (MTS) to AE for exporting. It's about 4 minutes long and about 25 seconds into it it starts stuttering the video (not the audio) for about 30 seconds. After the 30 seconds it's fine. I've watched the original mts file and it does not stutter. Anyone know why it would do this and how to get around it? I shot the clip with the camera set to 24p. After Effects interpreted the frame rate correctly. But do I need to do a pulldown for it? If so, could that be what's causing it? If so I would think it'd stutter through the whole video. Thanks.


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Dave LaRonde
Re: stuttering image when exporting mts from AE
on Mar 30, 2010 at 9:22:22 pm

Dave's Stock Answer #1:

If the footage you imported into AE is any kind of the following -- footage in an HDV acquisition codec, MPEG1, MPEG2, AVCHD, mp4, mts, 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


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geoff swartz
Re: stuttering image when exporting mts from AE
on Mar 31, 2010 at 12:40:46 pm

Thanks Dave. Is there a best practice way of converting this type of file? Usually I bring the file into vegas and export it as a .mov file to use in AE. However there are times when vegas gets to 75% and never completes. Thanks.



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Dave LaRonde
Re: stuttering image when exporting mts from AE
on Mar 31, 2010 at 1:16:03 pm

You could give Adobe Media Encoder a whirl, or Sorenson squeeze... even quicktime pro. I don't know beans about Vegas.

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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