Guy Barwood
Forum Replies Created
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could it be a progressive CCD could output 30p or 60i? or would a CCD be either interlaced or progressive only, so for 60i it would actually need 60p capabilities and drop the unrequired field?
When can you start actually discussing the HD100 Ken? Is it the 13th?
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[Luis Caffesse] “Although, what sort of ‘integration’ level are you looking for? “
Look at the integration level of the JVC HDD unit on the GY-DV5000 and 5100. You get viewfinder status display etc It’s not just a dumb HDD recorder hanging off a 1394 port looking for start/stop messages.[Luis Caffesse] “Then Panasonic and Apple partnered up to bring us DVCProHD over firewire. Avid is now supporting DVCProHD over firewire as well. “
Thanks, always good to understand these things. -
[Jan Crittenden] “so how is my wanting it to work going to det it past that threshold? “
Pretty simple really. Any DVCPROHD firestore product is going to need to be a new model anyway, so the new model simply uses a processor that can handle the data throughput.
We never mention a particular Firestore model, just the product in general.
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[Graeme Nattress] “HDCAM uses 440mbitspersecond”
That’s quite a nice high data rate, especially for MPG4. The samples I have seen are the samples really to demo the concept of HD with MPG4 at low data rates (like 8Mbps), and from what I have seen that is just too much compression even for MPG4.[Graeme Nattress] “A 50mbits MPEG2 for HD acquisition would make total sense, but I’d still want to edit it uncompressed. “
Can’t argue with that, but I guess one of the the idea of 25Mbps was not just for compatibility with existing DV transports etc but also to seperate the HDV market from broadcast markets without killing it before it even starts by making it too low a bit rate altogether. Otherwise why wouldn’t 720p use the full 25Mbps it has available to it? -
[Luis Caffesse] “If FireStore wants to offer an external drive which can record DVCProHD, then they very well may. “
Perhaps, but it is unlikely to have the integration level that Panasonic could provide if the made their own unit.I also don’t know what the digital data interface for this camera would be anyway. Does it use a firewire interface? How is DVCPRO HD normally ‘captured’ (ie pre P2).
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I tried to register for those emails but the system created an error on every attempt. I think it was because I selected Australia from the country list, but didn’t put in a valid US post code…
Sounds like “Brian” is saying the JVC has a true native progressive CCD block while ‘others’ don’t. I sort of assumed the JVC would be a native progressive block, did anyone else think otherwise?
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[Jan Crittenden] “The only problem with this Michael is that the Firestore cannot capture DVCPRO HD. “
Sure it could if you wanted it to, but then no one would want to use P2 so its never going to happen, which is a shame as it is by far the most popular non tape ‘media’ around.
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[Graeme Nattress] “I don’t think a 15 frame GOP MPEG2 is 4 times as efficient as, say, DV, never mind a 6 frame GOP. It might just reach sort of DV quality on images with less movement. If they really wanted to use an efficient codec, why did they not use MPEG4?? Because they want to keep the cheap cameras lower quality?? As for chroma sampling, 4:2:0 is just about acceptable on progressive video, but quite ghastly on interlaced. “
I never said it was 4 times as efficient, I just reminded people that its not 4x as bad. MPEG4 is a very demanding codec to encode, MPG2’s got nothing on it. A real time MPG4 HD encoder would be much harder to develop (increasing costs) and consume much more power to run. Of the MPG4 HD videos I have seen (Microsoft’s HD WMV showcase which are essentially MPG4), they also have some serious problems encoding gradients (such as skys) and I for one am very happy they avoided it.
As for 4:2:0, I’m not sure what makes you say that as I have seen the Z1’s footage and when displayed properly it’s so far from ghastly its not funny. HDV 1080i 4:2:0 would have about twice the amount of colour info as 4:2:2 SD, yet everyone always raves about how beautiful the colours are in 4:2:2 SD….. With the pixels being so much smaller, the visual difference between 4:2:0 and 4:2:2 will be significantly less with HD than SD unless projected on very large screens.
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[Noah Kadner] “They’re both shooting HDV which is 4x as compressed as DVCPROHD and with less color depth”
More efficient codec means less loss in the compression for the same data rate. Then, with a lower colour space you don’t need the same data rate. I’m not here saying HDV is as good as DVCPRO HD at all, but I strongly argue agains a factor of 4x in the compression which is not so, as you are only basing your comparison on the pure bit rates.Although probably correct, the JVC may shoot higher bit rate or colour space than HDV, it is after all discribed as also ProHD compatible, which is as yet not specifically defined.
[Noah Kadner] “If you think that level of MPEG-2 type compression is going to endure 30 years on a mini DV tape with no dropouts you could be in for an unpleasant surprise or two. “
So your planning on archiving your P2 recorded footage on P2 media are you?[Noah Kadner] “And neither shoots 24p at 1080 like the HVX”
But you don’t know how the HVX shoots 24p/1080 either. Is it a 1280x720p CCD block with a software upres (in which case it is really no more capable than the JVC anyway)? Who knows, don’t assume you’ve got a 1920x1080p CCD block just yet.All I am thinking here is the points you are making are pretty flawed at the moment. It’s no time to can P2, but it also no time to sing the glory of P2.
[Noah Kadner] “And P2’s prices can only go down while capacities go up.”
Lucky for Panasonic of few of us could afford to even consider it. Then again who wants to spend a lot of money on a product that depreciates so quickly in price? “If I just wait a bit longer the price will drop some more”…