"Burst" mode possible?

[Jaakko Rinne]

How would 5k WS be possible? I'm going under the idea that 4096x2160 = ~8.85megs/frame = 4608x1920 (4.5k at 2.40:1 WS/Crop)... 5k WS is way more than that per frame (it's like 10 or 12meg/frame). Or are you going using 24 vs 30fps and comparing the total per second filtrate? If so, that's not a reasonable assumption (4.5k is perfectly reasonable though).

One would assume that the amount of data (or number of pixels) captured per second is what counts. 4096*2160*30 is exactly the same as 5120*2160*24 (265420800). Why wouldn't it be reasonable to compare 4K 30fps to 5K WS 24fps?

[Lliam Worthington]

There seemed to be a bit of debate and uncertainty about how the the FS700 does slow motion bursts. At upto 240fps it appears that it is 100% full resolution, for upto 10 seconds, which is very impressive. One slight problem (for some) is that it appears that it won't work with external recorders as it doesn't play at realtime speed through the HDMI, it write to the internal card at 3x speed - good because its quick, but I'm sure that means it won't work with Nanoflash etc. I'm sure this could be easily solved with firmware. This does mean that you're left with the 28 mb/s codec, which for some is fine, but for many is not good enough.
This is different to cameras like the Phantom, where once you've got your burst stored in RAM you can play it back at normal speed, even set in and out points instead saving the whole file, whereas the Sony seemingly doesn't give you any options - as soon as you finish the recording it writes to card immediately, and all you do is cancel it or let it record.
Steve

Cheers for that post Steve

[Scott Crawley]

There seemed to be a bit of debate and uncertainty about how the the FS700 does slow motion bursts. At upto 240fps it appears that it is 100% full resolution, for upto 10 seconds, which is very impressive. One slight problem (for some) is that it appears that it won't work with external recorders as it doesn't play at realtime speed through the HDMI, it write to the internal card at 3x speed - good because its quick, but I'm sure that means it won't work with Nanoflash etc. I'm sure this could be easily solved with firmware. This does mean that you're left with the 28 mb/s codec, which for some is fine, but for many is not good enough.
This is different to cameras like the Phantom, where once you've got your burst stored in RAM you can play it back at normal speed, even set in and out points instead saving the whole file, whereas the Sony seemingly doesn't give you any options - as soon as you finish the recording it writes to card immediately, and all you do is cancel it or let it record.
Steve

Thanks for the info.

Keeping in mind that at full resolution this burst requires the system to process an order of magnitude more pixels. It is very impressive indeed.

It appears that you are saying it takes 30 seconds to write the 10 second burst, is that right? Presumably this is either because it can not physically write the data fast enough or it is due to a limitation of processing power/speed. It may be both. If the problem is processing power, then it would be incorrect to asssume that more compression would solve the problem. In fact, it would compound the problem.

If the Scarlet possesses enough RAM to do the job we are still left with this question of processing power, which we know to be an issue beyond 4k regular speed.

[Steve Phillipps]

It appears that you are saying it takes 30 seconds to write the 10 second burst, is that right?

No, it does something like 8 seconds realtime, so at 240fps you end up with an 80 second shot at 24P, this writes to the card at 3x speed so it takes about 25 seconds to write it to the card. If you wanted to write it to a Nanoflash or similar via playback mode you'd need it to playback realtime, taking 80 seconds to write it - this is how it works with Phantom if writing via HDSDI, but as I said with Phantom you can mark in and out points and only save the bit you want, really good. Don't see any reason why the FS700 couldn't have software to go into playback mode after the burst allowing you to do the same thing.
Steve

[Andy White]

Yes, but once it's buffered back to the card, it's compressed... so playing off to a nanoflash in realtime will mean recording a compressed source.

[Steve Phillipps]

Yes, but once it's buffered back to the card, it's compressed... so playing off to a nanoflash in realtime will mean recording a compressed source.

Yes, so what I mean is playing it while in the RAM buffer as you do with the Phantom, trim your shot, and then write to the card / external recorder.
Steve

[Scott Crawley]

You've seen a pre-production unit do this, or are you interpreting specs?

No, it does something like 8 seconds realtime, so at 240fps you end up with an 80 second shot at 24P, this writes to the card at 3x speed so it takes about 25 seconds to write it to the card. If you wanted to write it to a Nanoflash or similar via playback mode you'd need it to playback realtime, taking 80 seconds to write it - this is how it works with Phantom if writing via HDSDI, but as I said with Phantom you can mark in and out points and only save the bit you want, really good. Don't see any reason why the FS700 couldn't have software to go into playback mode after the burst allowing you to do the same thing.
Steve

[Steve Phillipps]

No, that is what it does, it's been described in several reviews. Are they out in the States yet? The first ones arrived at the dealers in the UK a few days ago.
Steve

[Scott Crawley]

No, that is what it does, it's been described in several reviews. Are they out in the States yet? The first ones arrived at the dealers in the UK a few days ago.
Steve

B&H status is still "pre-order".

[Steve Phillipps]

B&H status is still "pre-order".

Yeah, I didn't realise it had shipped, I called someone the other day to ask when they expected them and they said they'd had their first shipment earlier this week.
Steve