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JVC GY-HD Series Camera Systems
GY-HD 100 & 200 series ProHD HDV camcorders & decks.

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Old March 14th, 2005, 09:24 AM   #16
Major Player
Join Date: Jul 2004
Posts: 587
I don't think any special editing software would be needed. All you need is the ability to import the footage and output it in an uncompressed format. If they record 24 real frames per second only then there would be no further processing required.
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Old March 14th, 2005, 02:16 PM   #17
Barry Wan Kenobi
Join Date: Jul 2003
Location: North Carolina
Posts: 3,830
Sounds like "ProHD" will indeed be a new format, sort of like a DVCAM version of DV was a new format, even though the internals were all basically the same.

I don't know if JVC has announced any specs on the GOP or anything else about the 24P option, other than to say that it's still 19mbps. Even if the GOP is the same length, that's still good news, as it means each frame will get more bits allocated to it than would have happened in HDV 720/30p, so more efficient compression and fewer artifacts.

If the GOP is shorter or longer, that's both good and bad. Shorter GOP means easier/more efficient editing, less impact of dropouts, and less impact of variable-resolution imaging on high-motion, high-frequency changes. However, MPEG compression excels at longer-GOP lengths, that's where the efficiency of the MPEG compression really comes into play, and why HDV on the FX1/Z1 can look so great (especially on relatively static shots) at such a tiny bitrate.

The thing to keep in mind is, the GOP in 720p is already a *lot* shorter than it is in 1080i. In Sony's 1080i version of HDV the GOP is 15 frames, but in JVC's 720p implementation it's already a six-frame GOP. So even if the GOP stays the same for ProHD 720/24p, it'll still be much shorter than the GOP in 1080/60i HDV.
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Old March 14th, 2005, 08:48 PM   #18
MPS Digital Studios
Join Date: Apr 2003
Location: Palm Beach County, Florida
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I thought it was still mpeg2-ts, which would require special software, unfortunately. ARGH!

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