Corrupt Clips? --Trying to figure out the cause... at DVinfo.net

Go Back   DV Info Net > Panasonic P2HD / AVCCAM / AVCHD / DV Camera Systems > Panasonic P2HD / DVCPRO HD Camcorders

Panasonic P2HD / DVCPRO HD Camcorders
All AG-HPX and AJ-PX Series camcorders and P2 / P2HD hardware.


Reply
 
Thread Tools Search this Thread
Old January 25th, 2007, 09:10 PM   #1
Major Player
 
Join Date: Jul 2004
Location: Los Angeles, CA
Posts: 327
Corrupt Clips? --Trying to figure out the cause...

I just finished a show shooting 720/24pN onto two 8 GB cards that were rotated through P2 Genie on a PB G4.

3 of the 8 card loads we shot would not import into Final Cut 5.1.2, so I used P2 Log to export those cards as XML. It seems that most, if not all, of the clips have corrupted audio. All four channels constantly cut in and out, and not in unison.
What's more-- at the end of the clip, I see flat grey macroblocking/artifacting-- something I have NEVER seen before with P2 footage.

Attached are screen caps of the artifacting and the audio waveforms from the bad channels (all channels are doing this, not just the XLR-in on CH 1/2).

Any ideas as to the source of the problem? Is it the camera?
Attached Thumbnails
Corrupt Clips? --Trying to figure out the cause...-artifactsp2.jpg   Corrupt Clips? --Trying to figure out the cause...-audiobreaksp2.jpg  

__________________
Matt Irwin
DP / matt.irwincine.com
Matt Irwin is offline   Reply With Quote
Old January 26th, 2007, 12:47 AM   #2
Go Go Godzilla
 
Join Date: Nov 2004
Location: Scottsdale, AZ USA
Posts: 2,739
Images: 15
There's not enough info to determine if the culprit lies with the camera, P2 Genie or the PB. Here's what I would do to see if the camera/cards themselves are working properly:

- Wipe the card/s and shoot some test footage. If you don't see an "!" symbol in any of the thumbnails then you know the footage as-is in the camera is good. Play the clips back in-camera and see if you notice any issues.
- Connect an external FW drive directly to the camera and offload the clips using HOST mode. Make sure the "verify" function is turned on. If they transfer to the drive without errors then you know the data came out intact.
- Import the clips directly into FCP; don't use P2 Genie or P2 Log to trancode them into QT's or XML's. If you don't see problems there then you can eliminate the camera, cards, FCP and the PB as the source of the problem.
- Take those same clips and use either P2 Genie or P2 Log to transcode them again. See if the same issues return.

This process of elimination should point to where the problem lies; let us know what you find out.
__________________
Producer/CEO
Reel Lane Films LLC
Robert Lane is offline   Reply With Quote
Old January 26th, 2007, 01:42 AM   #3
Major Player
 
Join Date: Jul 2004
Location: Los Angeles, CA
Posts: 327
Thanks Robert. I'll test this in the morning and post my findings.

Perhaps it could be a problem with the on-set workflow we used:
-Card from camera to PB G4's PC card slot.
-Use P2 Genie to transfer the card contents to an external FW400 drive
-Reformat card in the camera during reload
-Ingest into FCP from the external FW400 drive to work drive
__________________
Matt Irwin
DP / matt.irwincine.com
Matt Irwin is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > Panasonic P2HD / AVCCAM / AVCHD / DV Camera Systems > Panasonic P2HD / DVCPRO HD Camcorders

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 07:00 PM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network