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May 29th, 2012, 10:27 AM | #16 |
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Re: One Summer Evening with the FS700
Not quite sure how Den managed that and I'm not sure he is too, as the Samurai on paper can't do 1920x1080 50p or 60p.
I'm still looking in to this. I'll have access to a FS700 on Thursday and I'm taking my Gemini which can do 1080p60 to test it out.
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May 29th, 2012, 10:31 AM | #17 |
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Re: One Summer Evening with the FS700
Look forward to your results Alister - Happy Shooting!
Lonnie
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May 29th, 2012, 12:53 PM | #18 |
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Re: One Summer Evening with the FS700
Keep us posted Alister. I would enjoy getting to try one out myself.
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May 31st, 2012, 06:29 AM | #19 |
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Re: One Summer Evening with the FS700
I did a Weisscam 1000fps shoot yesterday and this is the exact same principal that camera works under. It internally records to a RAM buffer then prints out to HD-SDI in real time, so it takes a while until you can take another shot. I have to say filming rugby players at 1000fps under a bevy of 18K HMI's looked absolutely amazing.
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May 31st, 2012, 03:43 PM | #20 |
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Re: One Summer Evening with the FS700
I can confirm that you can read the 50/60 fps buffer stream vis 3G Sdi to an external recorder. I was able to test it today recording uncompressed to a Convergent Deign Gemini. So, 240fps uncompressed is possible. Very cool!
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May 31st, 2012, 04:36 PM | #21 |
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Re: One Summer Evening with the FS700
Thanks for the follow up, Alister!
Will a single link HD-SDI work at the 240fps or does it need to be 3G? (the Samurai specs per their website, they list the input as HD/SD and the output as 3G/HD/SD. And based on Den Lennie's report - I'm a little confused...) Thanks for shedding info and light! Lonnie
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June 1st, 2012, 02:59 AM | #22 |
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Re: One Summer Evening with the FS700
The FS700 writes slow mo from the memory buffer to AVCHD and the SD card at either 50 or 60 fps depending on which country zone the camera is set to. The camera output can be set in the menu to either 25/30p or 50/60p, if set to 50/60p the output is 3G. In either case the buffering happens at 50/60p. So, if the output is set to 25/30p you only get every other frame on the output Sdi at 1.5G. The end result of this is that if you shoot at 200 fps with the camera output at 25p you would end up with an external recording the equivalent of 100 fps with a 180 degree shutter. Still very useful and a nice option. But to get the full benefit of external recording you need to set the FS700 to output 50/60p over 3G SDi and then you must use an external recorder that has 3G SDi and can record at 1080 50/60p which the samurai can not do.
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June 1st, 2012, 06:40 AM | #23 |
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Re: One Summer Evening with the FS700
Thanks for the succinct answer and always a pleasure to read and watch your craft, Alister!
Lonnie
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June 2nd, 2012, 09:39 AM | #24 | |
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Re: One Summer Evening with the FS700
Quote:
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June 2nd, 2012, 06:36 PM | #25 |
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Re: One Summer Evening with the FS700
God that 240fps is sweet, I thought the S&Q 60p on the FS100 was the beez-neez. This already has me thinking upgrade from my FS100 that I've had for a scant 2 weeks now. Nice...
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June 6th, 2012, 02:46 PM | #26 | |
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Re: One Summer Evening with the FS700
Quote:
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June 7th, 2012, 10:54 AM | #27 |
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Re: One Summer Evening with the FS700
Yes, that is correct. It would be the equivalent of 120fps with a 180 degree shutter or 1/240 shutter.
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June 9th, 2012, 10:44 AM | #28 |
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Re: One Summer Evening with the FS700
One thing probably worth considering with overcrank 60fps, 120fps, 240fps footage recorded to AVCHD is that AVCHD has a significant temporal compression component which likely gets more efficient as motion gets slowed down. As you increase framerates, the similarities between frames almost always become significantly greater, which should allow the efficiency of long-GOP AVCHD to increase substantially. I'd be interested in testing this, but my understanding is that GOP codecs do exceedingly well at recording a bunch of very similar frames.
Then again some of this effect may be lessened slightly given the lack of motion blur at such frame rates. |
June 9th, 2012, 11:25 AM | #29 |
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Re: One Summer Evening with the FS700
Yes, long GOP codecs become more effective at higher frame rates due to the reduced temporal differences between frames. The FS700 takes full advantage of this. At up to 30fps the bit rate is 24Mb/s, when you go to S&Q mode the bit rate increases to 28Mb/s for 60fps, so only a 4Mb/s bit rate increase but double the number of frames.
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June 9th, 2012, 12:49 PM | #30 |
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Re: One Summer Evening with the FS700
isn't the 28Mbps AVCHD mode only for 1080p60 recorded footage? That is how it works on my FS100, if I want to record S&Q it is always records the 60fps footage into 24fps FX mode (24MBps)
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