Problems with AVCHD in Premiere CS6

T

TonyP

New member
I shot a video for the cafe I work at on a Panasonic AC90 at 1080p24. While I was editing the images looked fine--some occasional ghosting that I've inquired about in another thread--but when I export it looks all sorts of messy. I used the Vimeo presets in export since that is where the video went. At vimeo HD 1080p24 the video was all jittery. I solved that problem bumping it down to the 720p24 preset for Vimeo but that resulted in a lot of noise and pixels that weren't there in the preview. Exporting it with Match Sequence Setting selected corrects the jittery play back, but the ghosting and noise is still there. Those could be technical issues outside of the editing process (would not enough light account for the noise? No idea on the ghosting...) but I'm asking here because again, I didn't see any of these problems prior to export. I've gone back and expanded the program monitor window and can't find any traces of ghosting in the project. Sorry to pull a total noob move and come crying here with what very well could be a simple issue, I just have exhausted searching for the answer on my own.
Here's the 720p24 version of the clip on Vimeo. The blacks are the noisiest, and I wasn't using gain at all:
https://vimeo.com/62674653

Thanks guys!
 
If you captured at 1080p24, bring it into PPro in a 1080p24 sequence. Do your work at 1080p24, then use AME to export it to whatever settings you want. Let AME do the transcoding.

Vimeo, YouTube, and just about any web video service you can find compress and squeeze the life out of videos for at least two reasons. Storage space on their servers, and bandwidth when serving up your video to the web. This compression can result in all sorts of interesting artifacts, not the least of which is macroblocking.
 
I captured, imported and worked all in 1080p24, yes. But what accounts for the ghosting when I export via PPro with Match Sequence Settings? That option makes it sound like the easiest way to get a viewable, high quality export, but that could just be my own misunderstanding. If I just wanted to have a quality video on my computer to watch and show people what would be best? I've tried H.264 with similar results as listed above.
 
It could be an issue with your computer monitor/video card settings too. I am not seeing any serious macro blocking or noise issues on my laptop but the video card can do a lot to clean it up. There is some noise in the blacks, maybe you underexposed just a tad. But it doesn't seem that objectionable to me. The issues with motion I put down to AVCHD codecs and CMOS sensor rolling shutter. The slight ghosting seems to be a pretty common motion artifact depending on the computer doing the decoding. My Tohsiba laptop with a high end Radeon graphics chipset doesn't show it most of the time. My Dell desktop at work does show it more it seems.
 
Ok, maybe I'll take this footage and the PPro project to campus and use their hardware. I'm using a Dell desktop and I do know it exceeds the minimum requirements but is closer to the lower side. Thanks for the help!
 
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