Author Topic: Resolutions, 50fps and write speeds  (Read 4702 times)

moswanted

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Resolutions, 50fps and write speeds
« on: June 14, 2013, 03:22:25 PM »
Hey guys,

I'm getting very inconsistent results when recording raw footage (5DM3, 64GB Komputerbay 1000x cards).

I'm mostly interested in a 50fps workflow, so I tested a few resolutions and settings to get the best results. 1600x560 works all the time, at about 72MB/s continuous. The next resolution (17xx) USUALLY starts dropping at about 350frames with about 80MB/s. Sometimes though (1 out of 10), after changing settings, I can record the 17xx resolution, continuously, straight out of nowhere. But only once, every record after that fails again. Additionally, I'm not able to reproduce this phenomenon, it just happens.

And: 1920 x 1080 in 25fps record flawlessy at about 95MB/s and I even get a few higher resolutions continous recording at about 105 MB/s.

Why does 50fps start dropping frames at about 80MB/s while I can record 25fps continuous up to 105 MB/s? If I turn off the LiveView even a little more. The card easily benchmarks somewhere between 115MB/s (ML benchmark) and 130MB/s (Windows).

Also, any tipps/hints on optimizations? NR, Auto-Stuff already off, Memory Hack on, Global Draw off, ML running from SD card, Recording on CF.

And again a HUGE thank you to all devs and the community: what you guys achieve here is simply outstanding and unbelievably appreciated.

tihon

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Re: Resolutions, 50fps and write speeds
« Reply #1 on: June 14, 2013, 03:49:28 PM »
Nice topic! Thanks! I really interested of  50-60 fps recording on mark 3! And need more information about that!
Did you try 1728x512 -  50fps? I think it's should recording continuously
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moswanted

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Re: Resolutions, 50fps and write speeds
« Reply #2 on: June 16, 2013, 01:48:49 PM »
Update:

50fps:
1600 x 560: 81mb/s continuous, 7% idle
1700 x 606: 81mb/s about 15sec, no idle

25fps:
1920 x 1080: 97mb/s cont, 15% idle
1920 x 1152: 97mb/s cont, 7%idle
1920 x 1280: 97mb/s about 15sec, no idle

So is CPU the bottleneck at the moment?

tihon

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Re: Resolutions, 50fps and write speeds
« Reply #3 on: June 16, 2013, 02:29:02 PM »
Update:

50fps:
1600 x 560: 81mb/s continuous, 7% idle
1700 x 606: 81mb/s about 15sec, no idle

25fps:
1920 x 1080: 97mb/s cont, 15% idle
1920 x 1152: 97mb/s cont, 7%idle
1920 x 1280: 97mb/s about 15sec, no idle

So is CPU the bottleneck at the moment?

Sorry, but what does idle mean?)
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moswanted

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Re: Resolutions, 50fps and write speeds
« Reply #4 on: June 16, 2013, 03:49:11 PM »
idle = not busy. not sure though if it means processing cycles or write cycles.

tihon

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Re: Resolutions, 50fps and write speeds
« Reply #5 on: June 16, 2013, 04:26:44 PM »
Thanks! Now i see.

And what max resolution you can get  with 60fps?
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moswanted

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Re: Resolutions, 50fps and write speeds
« Reply #6 on: June 16, 2013, 09:15:13 PM »
1472 x 516, 60fps, continuous at 74mb/s

tihon

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Re: Resolutions, 50fps and write speeds
« Reply #7 on: June 16, 2013, 09:48:26 PM »
thanks! I wish we can get 1600px on 60 fps
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Videoshooter

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Re: Resolutions, 50fps and write speeds
« Reply #8 on: June 17, 2013, 01:17:23 PM »
Any of you guys (or girls!) shooting 50/60p have any samples that you've uploaded? I've seen one sample online but it wasn't a very usefull test shot.

jpjp

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Re: Resolutions, 50fps and write speeds
« Reply #9 on: June 19, 2013, 11:29:45 PM »
There's one here http://vimeo.com/67714338