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proper settings for 4K video (a7sii)


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new to this forum...

 

I've updated my a7sii to the v2.1 firmware which I understood supported 4K RAW video recording...

 

Am I misunderstanding? I don't see any new options in the camera's menus.

 

Is 4K video always saved as an .mp4 file? This is a lossy format. Is there no lossless format supported?

 

Can anyone suggest a good how-to video tutorial covering 4K video for this camera?

 

Thanks in advance.

 

-- Dave.

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  • 2 weeks later...

new to this forum...

 

I've updated my a7sii to the v2.1 firmware which I understood supported 4K RAW video recording...

 

Am I misunderstanding? I don't see any new options in the camera's menus.

 

Is 4K video always saved as an .mp4 file? This is a lossy format. Is there no lossless format supported?

 

Can anyone suggest a good how-to video tutorial covering 4K video for this camera?

 

8-bit 4k RAW video is about 35 gigabytes per minute. A 128GB card would hold about 3.5 minutes of material if it could actually accept the 500+ megabyte/sec data stream. The closest you could practically get to that would be using an external Atomos Shogun recorder: https://www.atomos.com/shogun/

 

That is why 4k video is typically saved as a compressed file for in-camera recording, typically using the H.264 codec. See below calculator for estimating various video bit rates and file sizes:

 

http://toolstud.io/video/filesize.php?imagewidth=1920&imageheight=1080&framerate=25&timeduration=60&timeunit=seconds

 

Editing 4k video smoothly also requires a very powerful computer. Dave Dugdale has a comprehensive class on shooting video with the A7SII: http://www.learningvideo.com/store/a7sii_sales.php

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