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Introduction
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| Table of Contents |
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Introduction
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| Version | DVCPRO | DVCPRO50 | DVCPRO HD |
|---|---|---|---|
| Record time | Large cassettes: up to 126 minutes Medium cassettes: up to 66 minutes | Large cassettes: up to 63 minutes Medium cassettes: up to 33 minutes | Large cassettes: up to 31 minutes Medium Cassettes: up to 16 minutes |
| Track pitch | 18 microns | 18 microns | Long play: 18 microns Short play: 9 microns |
| Track width | 18 microns | 18 microns | 18 microns |
| Record/playback speed | 33.82 mm/sec (1x) | 67.63 mm/sec (2x) | 135.28 mm/sec (4x) |
| Bitrate | 25 Mbit/s | 50 Mbit/s | 100 Mbit/s |
| Bit depth | 8 bit | 8 bit | 8 bit |
| Colour sampling | 4:1:1 | 4:2:2 | 4:2:2 |
| Resolution | NTSC: 720x480 PAL: 720x576 | NTSC: 720x480 PAL: 720x576 | Uses downsampling:
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| Compression | 5:1 DCT compression | 3.3:1 DCT compression | 6.7:1 DCT compression |
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| Panasonic DVCPRO Tape | DVCPRO | DVCPRO50 | DVCPROHD | DVCPROHD-LP | Tape Length |
|---|---|---|---|---|---|
| Model | Recording and playback times | (metres) | |||
| AJ0P12M (Medium Cassette) | 12 minutes | 6 minutes | 3 minutes | 6 minutes | 27 m |
| AJ-P24M (Medium Cassette) | 24 minutes | 12 minutes | 6 minutes | 12 minutes | 51 m |
| AJ-P33M (Medium Cassette) | 33 minutes | 16.5 minutes | 8 minutes | 16.5 minutes | 70 m |
| AJ-P46M (Medium Cassette) | 46 minutes | 23 minutes | 11.5 minutes | 23 minutes | 96 m |
| AJ-P66M (Medium Cassette) | 66 minutes | 33 minutes | 16.5 minutes | 33 minutes | 137 m |
| AJ-P34L (Large Cassette) | 32 minutes | 17 minutes | 8.5 minutes | 17 minutes | 72 m |
| AJ-P66L (Large Cassette) | 66 minutes | 33 minutes | 16.5 minutes | 33 minutes | 137 m |
| AJ-P94L (Large Cassette) | 94 minutes | 47 minutes | 23.5 minutes | 47 minutes | 194 m |
| AJ-P126L (Large Cassette) | 126 minutes | 63 minutes | 31.5 minutes | 63 minutes | 259 m |
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| Info | ||
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Panasonic DVCPro Compatibility & Interchangeability Recording & Playback Times/Application |
Technical standards
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| Format | Standards |
|---|---|
| DVCPRO, DVCPRO 50 |
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| DVCPRO HD |
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| Binder deterioration | ||
|---|---|---|
| Description | Commonly known as "sticky shed syndrome." Affected records will have a visible gummy or powdery residue on the surface of the tape. This can damage both the recorded material and playback equipment. Back-coated tapes are most affected by this type of deterioration. | |
| Cause | Polyester urethane is prone to moisture absorption which can cause the molecular structure of the binder to break down. This process is accelerated by high temperature and high humidity. | |
| Remedy | Environmental conditioning: Moving the tape to a controlled storage environment (40°C / 20 to 25% Relative Humidity) may reverse the affects of hydrolysis over time. Baking: Holding the tape at an elevated temperature (45°C to 55°C) for a brief period of time (up to 36 hours) can temporarily remove moisture and allow normal playback for a period of one to two weeks. Tapes should not be rewound before baking. | |
| Drop-out | ||
| Description | A brief signal loss caused by a tape head clog, missing magnetic oxide particles, tape defect, or debris on the tape or machine. These factors can reduce head-to-tape spacing and result in the appearance of white spots or streaks on playback. Multiple drop-outs per frame will result in a snowy appearance. | |
| Cause | Tapes kept in dusty conditions will accumulate particulate matter, increasing the risk of drop-out. | |
| Remedy | Flaking/missing magnetic oxide particles are an indication of tape deterioration. This type of drop-out cannot be corrected physically. | |
| Mould | ||
| Description | Active mould is generally moist while dormant mould is dry and dusty. Mould growths may be white, black, brown or mustard-coloured and usually have a pattered, fuzzy, or thread-like appearance. Mould can cause permanent damage to tapes over time if not removed. Fungus and mould is also a significant health hazard and affected materials should be handled using gloves and masks. | |
| Cause | Storing tapes at high temperature and relative humidity levels can facilitate the growth of mould. | |
| Remedy | Mouldy tapes should be isolated from unaffected materials to prevent cross contamination. Store tapes at a temperature of 24°C in an environment with effective air circulation and less than 50% Relative Humidity. Loose mold can be vacuumed from the tape pack and then the tape should be treated with an appropriate fungicide. | |
| Stretching and breaking | ||
| Description | The elongation of parts of the tape, across the full width of the tape or -most likely- on one or the other side of the tape The separation of tape into two or more pieces. | |
| Cause | usually results from either improper wind or from faulty equipment. May cause long-edge or curvature problems, and distort the signal, but the data can generally be retrieved from an analog tape, usually with a decrease in signal quality." Improper handling or use of playback equipment. | Remedy |
| Accidental recording | ||
| Description | Camera operators can accidentally record over pre-existing footage | |
| Cause | Tape is set to "record mode" when it is inserted into camera or deck | |
| Remedy | Ensure tape is set to "safe mode" before inserting into camera or deck | |
Further Reading
Visit the /wiki/spaces/ALC/overview for further reading on /wiki/spaces/ALC/pages/1891631115.
References
Casey, Mike. "FACET: Format characteristics and preservation problems." Bloomington, IN: Indiana University, 2007.
Gibson, Gerald. D. "Magnetic tape deterioration: recognition, recovery and prevention." Paper presented at the IASA Conference, Perugia, August 26, 1996.
MediaCollege.com. (n.d.). The DVCPRO Video format. Retrieved from https://www.mediacollege.com/video/format/dv/dvcpro.html
MediaCollege.com. (n.d.). The DVCPRO50 format. Retrieved from https://www.mediacollege.com/video/format/dv/dvcpro50.html
MediaCollege.com. (n.d.). The DVCPRO HD format. Retrieved from https://www.mediacollege.com/video/format/dv/dvcprohd.html
Museum of Obsolete Media. (2020). DVCPRO (1995 – early 2010s). Retrieved from https://obsoletemedia.org/dvcpro/
Museum of Obsolete Media. (2020). DVCPRO HD (2000 – early 2010s). Retrieved from https://obsoletemedia.org/dvcpro-hd/
Museum of Obsolete Media. (2020). DVCPRO50 (1997 – early 2010s). Retrieved from https://obsoletemedia.org/dvcpro50/
TapeOnline. (2020). DVCPRO FAQ. Retrieved from https://tapeonline.com/dvcpro
Texas Commission on the Arts. (2004). Videotape Identification and Assessment Guide. Retrieved from https://www.arts.texas.gov/wp-content/uploads/2012/04/video.pdf
Wheeler, Jim. "Videotape preservation handbook." 2002.
https://www.digimad.es/en/dv-video-ntsc-pal-dvcpro-hd.html
DVCPro FAQ: https://tapeonline.com/dvcpro
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| equipment. | |
| Remedy | |
| Accidental recording | |
| Description | Camera operators can accidentally record over pre-existing footage |
| Cause | Tape is set to "record mode" when it is inserted into camera or deck |
| Remedy | Ensure tape is set to "safe mode" before inserting into camera or deck |
Further Reading
...
Visit the /wiki/spaces/ALC/overview for further reading on /wiki/spaces/ALC/pages/1891631115.
References
...
Casey, Mike. "FACET: Format characteristics and preservation problems." Bloomington, IN: Indiana University, 2007.
DigiMad. "Digital Video DV." Accessed February 2, 2021.
Gibson, Gerald. D. "Magnetic tape deterioration: recognition, recovery and prevention." Paper presented at the IASA Conference, Perugia, August 26, 1996.
MediaCollege.com. "The DVCPRO Video format." Accessed January 10, 2021.
MediaCollege.com. "The DVCPRO50 format." Accessed January 10, 2021.
MediaCollege.com. "The DVCPRO HD format." Accessed January 10, 2021.
Museum of Obsolete Media. "DVCPRO (1995 – early 2010s)." January 10, 2021.
Museum of Obsolete Media. "DVCPRO HD (2000 – early 2010s)." January 10, 2021.
Museum of Obsolete Media. "DVCPRO50 (1997 – early 2010s)." January 10, 2021.
TapeOnline. "DVCPRO FAQ." January 10, 2021.
Jimenez, Mona and Liss Platt. "Videotape Identification and Assessment Guide." Texas Commission on the Arts. 2004.
Wheeler, Jim. "Videotape preservation handbook." 2002.
Wilt, Adam J. "The DV, DVCAM & DVCPRO Formats." August 28, 2005.
https://www.broadcaststore.com/pdf/model/777279/AJ-HD150.pdf
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