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P2

Système d’enregistrement stable proposé par Panasonic pour l’enregistrement de vidéos DV, DVCPRO et DVCPRO HD sur mémoire flash, la norme P2 assure meilleures vitesse et fiabilité des que l’enregistrements sur bande. Cependant, elle ne permet pas d’effectuer des enregistrements aussi longs et son prix de revient reste élevé. Actuellement, les cartes P2 permettent de stocker jusqu’à 8 Go de données, soit environ 40 minutes en DV, 20 minutes en DVCPRO 50 ou 10 minutes en DVCPRO HD.

Toutefois, grâce aux fonctionnalités d’enregistrement en boucle et d’accès aléatoire, cet espace est mieux optimisé que la longueur de bande équivalente. Le processus peut inclure une sélection automatique de plans et un vidage ultra-rapide des données vers un emplacement de disque dur, à des fins de montage, le tout directement à partir de la caméra.

 

 

P2: (Professional Plug-in). Solid state cards used to record video for all of the latest crop of Panasonic HD cameras. Cards have no moving parts, making them a robust recording format. The most exciting part of this format is the ability to bypass the traditional videotape route, instead recording data on to cards similar to storing files in a computer. This allows the user to access any shot from any part of a shoot without having to rewind or fast forward through a tape. All content is available in a random access manner. Any shots photographed in slow or fast motion can immediately be viewed (on set or in the computer) at their intended playback speed without any additional processing. These cards are compatible with both Avid and Final Cut systems. Unlike tape, the "ingest" process into the computer editing system can happen in faster than real time. The cards are meant to be re-recordable, so a backup strategy is highly recommended.

The cards are capable of recording several different flavors of  720 and 1080 line HD formats, as well as 480 SD formats, but overall, the cards are capable of recording using one of two different compression schemes:

  • DVCPRO 25, 50
  • DVCPRO HD
  • AVC-Intra

More information about DVCPRO HD can be found in the section SD Tape Formats. More information about AVC-Intra can be found in the section Compression Formats. Whichever format is used, the P2 cards store the data in the form of the MXF file format, which you can think of as a "wrapper" for the video content. An editing system may be capable of reading the MXF data natively, or the data may need to be converted into a different "wrapper". For example, Final Cut Pro converts the MXF data into QuickTime files. Its still the same data, just with a different wrapper, this time a QuickTime wrapper.

Not all Panasonic cameras are capable of recording to the newer AVC-Intra format. One popular camera capable of recording to P2 cards is the HVX-200 but this camera can only record toDVCPRO or DVCPRO HD. On the other hand, a newer camera like the HPX-2000 can record DVCPRO and AVC-Intra formats.

The current crop of cards comes in the following sizes: 2GB, 4GB, 8GB, 16GB and 32GB. To get an idea of the differences between recording DVCPRO HD vs. one of the two recording modes of AVC-Intra, the following chart provides recording times, recorded frame size, color space and bit depth for a couple differentHD formats.

As you can see, AVC-Intra (100) provides for the same recording time as DVCPRO HD, but AVC-Intra records a full frame size and higher bit depth than DVCPRO HD. On the other hand, if you need to maximize recording time, AVC-Intra (50) doubles the recording time, but at the sacrifice of a smaller horizontal frame size and a lower quality color space.

 

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