Digital Glitches in my AF100 footage

B

Basia

Member
Hello everyone,

I shot a talk with the AF100, on 1080/24p settings. When I used Log and Transfer to create ProRes 422 clips, there are several glitches in the resulting clips. It seems the glitches are a result of the transcoding, because when I transcoded the clips twice the glitches showed up in different places in the files. I used the same camera/computer/workflow in a previous project and didn't notice anything like this. Anyone have any ideas? Here are links to 2 short clips where the glitches are visible.

http://dl.dropbox.com/u/23034803/Digital Glitch.mov

http://dl.dropbox.com/u/23034803/OTHER DIGITAL SLIP:WEIRDNESS ON MAN'S FACE.mov

In the first, the glitch appears in the window behind the interviewee. This "matrix" like glitch that recalls the days of tape, only happened a few times in my first ten minutes of interview.

The second example is on the man's face, and it looks like a different kind of thing. Thanks very much for any help.
 
I'm on a MacBook Pro- if it's an issue with the computer it's strange because I didn't have it on the last film that I used this computer to edit. I have a MacPro as well...on which FCP crashes every time I try to use Log and Transfer. I guess if I can't fix this on my laptop I'll have to try reinstalling, etc on the desktop and see if I have better results there. Anyway, I'm trying it all again on my laptop now. I'm really hoping it's not a problem with the original AVHD files (though it doesn't seem to be based on the fact that the glitches come in different points in the footage.) Thankfully it was a short shoot! Thanks for your help.
 
What's the speed of your harddrive? If you're importing to the internal drive,
that's likely your problem (as they're usually 5400 RPM drives).

Try a FW800 external drive and create a Scratch and Render folder on the FW drive.
Make sure it's a 7200RPM drive and using FW800. Create a new project .. save it
to your FW drive .. and then do your Log and Transfer.

jeff
 
Last edited:
Thanks jmarkham- this is my laptop info:

Processor Name: Intel Core 2 Duo
Processor Speed: 2.4 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 3 MB
Memory: 8 GB
Bus Speed: 1.07 GHz

Unfortunately I don't think that's going to help because I already have once tried to use my external drive as a scratch. I will try again, maybe putting the AVHD original files on the external drive as well will help? I just keep getting glitches in all different places- very frustrating.

Thanks
 
Basia said:
Thanks jmarkham- this is my laptop info:

Processor Name: Intel Core 2 Duo
Processor Speed: 2.4 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 3 MB
Memory: 8 GB
Bus Speed: 1.07 GHz

Unfortunately I don't think that's going to help because I already have once tried to use my external drive as a scratch. I will try again, maybe putting the AVHD original files on the external drive as well will help? I just keep getting glitches in all different places- very frustrating.

Thanks
Click to expand...

I have a very similar configuration .. I'll try importing some AVCHD and see what happens.

We're moving to Premiere (which seems to handle AVCHD much better that FCP7 does).

jeff
 
Hi Basia

i experienced the same problem when using my macbook pro with a similar spec.

it seems to happen intermittently but only when using the internal drive as a capture scratch.

Joe
 
I see this consistently on my macbookpro. Doesnt seem to matter what hard drive is used. It does not happen if I use clipwrap.

Log and transfer works fine on my desktop.
 
Yikes. Well I'm glad I read this. Does it span all MBP models from the past few years? Just ones with Core 2 Duo?
 
Thanks everyone for your feedback. I used my desktop and it worked fine- no more glitches! It's a bummer though because sometimes I need to use my laptop when I travel. But strangely on my last film I had no problems at all using the MacBookPro to transcode to ProRes... I wonder what that's about.
 
I haven't seen this on my MacBook pro (similar specs) and I log/transfer most of my af102 footage with it...but always from a HD backup, not SD card. I often also log and transfer over the network to a LAN drive.
 
AnthonyR said:
I haven't seen this on my MacBook pro (similar specs) and I log/transfer most of my af102 footage with it...but always from a HD backup, not SD card. I often also log and transfer over the network to a LAN drive.
Click to expand...

I have yet to have it either with my macbook pro 3.06ghz core2duo w/ 4GB of ram. I never transcode directly from the card, I always offload to a drive and then transcode, and have not had an issue. My partner even lower spec macbook pro from the same generation that he brings a lot on set (we actually use it the most often to transcode) and has never had an issue on that. He does most of our editing, but we transcode on his or my MBP or his MacPro, but always direct from HDs, so maybe transcoding from SD cards is part of the issue...?
 
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