To P2 or not P2, that is the question…
April 30, 2006
I discuss Panasonic’s P2 technology and workflow in Part 2 of my article about the Panasonic AG-HVX200 camera that appears in the most recent issue of New England Film. As part of my research for the article I put together a music video shoot using P2 workflow and spoke with several filmmakers about their experience including Barry Braverman. I spoke with him about his perspective on P2 technology and its implications on workflow.
David Tamés: What do you see as the role of P2 technology in production and post-production?
Barry Braverman: P2 is Panasonic’s implementation of the SMPTE MXF format, Sony has XDCAM, their MXF format. P2 is a transport stream, very similar to any other transport stream, except it was created by the entertainment industry to facilitate the movement of files through the production process from image acquisition, hopefully, ultimately, through the digital intermediate. Digital cinema, for example, is an MXF format. The idea of MXF is that you have your audio and video, but you also have your metadata which is really at the focus of a lot of our discussion because metadata, accurately tracking metadata, represents for studios and producers a significant potential savings of money, because you can track for example, who shot this, who modified it, who graded it, who composited it, you have a record of access to that clip, which is contained in the metadata which travels along on this transport stream. And it’s effective because there’s no change to the video data or the audio data itself. The data simply moves along the pipe and pulling along all this other metadata which is what we need to facilitate digital workflow.
Tamés: Why did you get involved with P2 technology?
Braverman: I got involved with P2 because it represents Panasonic’s foray into an IT (information technology) based camera, [Panasonic’s P2 cameras] are the first IT based cameras that anybody has really produced. In the sense that we record data onto a card, like you would record a [word processing or spreadsheet] document, or anything else. The good side is that gives us additional capabilities, such as adjustable frame rates but the down side is that we’re not always dealing with a video stream and our equipment and our workflows have always been predicated on a video stream moving from here to there. If you don’t have a video stream, then how do you deal with it?
Tamés: So what kind of challenges does this new approach raise?
Braverman: Many users are uncomfortable making this transition. I think one of the challenges from an image acquisition perspective at the moment is limited storage, of the P2 cards, is probably the biggest, issue. Another challenge, from an operator’s point-of-view, is that since the camera is so quiet, it’s hard to tell when it’s running. Another challenge is archiving. Where’s your backup? This is the really big challenge, you don’t have original tapes to go back to, so that’s another thing you have to provide in your workflow, sufficient redundancy and protection to protect against loss of data.
Tamés: I think the possibility of data loss scares many producers.
Braverman: Early on in using P2 there have been cases of lost data for a variety of reasons. So not only do you need a workflow that has sufficient redundancy in place, you also need to understand when a clip is defective and corrupt, and it does happen. If you’re recording to the FireStore [hard drive recorder], if someone pulls the FireWire cable out, what happens to your show, or your clip? That clip has to be repaired. So any MXF device, including the HVX200, any P2 device, has the capability to repair clips, or disks, or cards. That’s a basic functionality because the transport stream is subject to corruption.
Tamés: Any recording system is subject to failure, videotape has it’s own set of problems.
Braverman: Tape is subject to dropouts, signal level problems, shrinkage, longevity issues. Betacam is stable for about fifteen years, consumer tape is even shorter, in two years you can begin to see signs of degradation.
Tamés: I guess your media is never really safe, no matter what it’s stored on. Clearly, the P2 card is simply a way to move media from the camera to a nonlinear editing station, from which you have to make your own archival backup. So how are we going to preserve our media?
Braverman: I think the biggest part of it is organization, be very careful to name things, name folders, and file folder hierarchy, it becomes really important now because of the use of servers, and locating files by servers, and database search engines, because ten years from now you’re only going to be able to find clips that you adequately and satisfactorily logged today. So that takes time and to understand what database you’re using. That’s what HD Log on the Mac side is intended to get you into, so you can manage [your media]. HDLog can also be used for other things. it’s also a viewer, and it allows you to edit your metadata. While you’re shooting [and attaching metadata to clips] that metadata is forever linked to the clip, it’s never lost, unless you bring it into Final Cut Pro (ouch). FCP and Avid do not currently use this metadata, Avid uses the fields for their own metadata, deviating from the MXF standard.
Tamés: So it looks like HDLog can help you keep track of your clip metadata even if your editing system does not preserve it at this time.
Braverman: The Panasonic P2 Viewer [for Windows XP and Windows 2000] is not as strong [as HDLog], it’s basically a free piece of software that comes with camera. These products are all in their infancy as manufacturers get feedback about how people are actually using them.
Tamés: Are there some things that a P2 workflow is better for than others?
Braverman: The camera works much better in it’s present state for commercials and music videos rather than long form documentaries or events where the camera needs to be running all of the time. That’s the the thing to remember, if you’re rehearsing and doing specified length scenes, then the camera works very well, because then you can anticipate if you have enough room on the card for this shot, but if you’re doing a documentary thing, you don’t know what’s going to happen, it’s a whole different deal.
Tamés: How would you compare Panasonic’s P2 to Sony’s XDCAM?
Braverman: XDCAM requires a playback device, you need a disk reader, a piece of hardware to play it back. Whereas the P2 card requires only a Cardbus compliant card slot. You can buy a card reader at a CompUSA for $30.00. There’s a quantitative difference in terms of orders of magnitude between the [cost of] integrating P2 into an IT based workflow and the integration of XDCAM into a workflow. Having said that, the advantage of XDCAM includes [being able to] offload disks at very high speed, and you can upload them to a server, but you still need a rather expensive disk player. Theoretically out of the camera you can upload through ethernet to a server, otherwise, you have to deal with the h ardware of a disk reader. I love what Sony did with the disk, they are very robust, very well engineered, very resistant to heat and humidity, and actual live moisture, because the disk spins off any excess moisture that builds up on the disk. Either route (P2 or XDCAM) in terms of technology makes sense to me. With the P2 route you have lower capacity to start with, the challenge of P2 is the lower capacity, whereas with XDCAM you have 23 GB on a disk, you have a much higher capacity out of the box.
Barry Braverman is a Hollywood-based cinematographer recognized for his work on National Geographic specials, commercials, and music videos.