new to video and need help

[adwb]

A couple of questions her from me which I dont understand after looking and looking on google. I did find shutter speed vs shutter frame rate which made things clearer but:-

I have seen it written that if you have the camera set to auto for the aps-c / super 35 then movie mode uses super 35 but on myA7r2 that does not happen i need to select it manually am I misunderstanding something?

also for XAVCS there are the two choices of 25p 100M and 25p 60M

25 is the frame rate ? is that correct ?

and should be matched to double the shutter speed =1/100 is that correct?

100M and 60M is the bit rate and 100 M will give a smoother video is that correct? 

if that is then correct then why is there a choice? 

I note that on XAVC S HD there is the choice of 50p 25p and 100p all at 50M compared to the XAVCS which only offer 25p

So why is there a choice 3 frame rates avaialble for the XAVC S format?

[Dollanganger]

They keep changing the settings options which do indeed make things confusing.

 

What exactly are you trying to shoot? Do you plan on uploading these videos to a website like YouTube? What program do you plan to edit these videos with?

[adwb]

They keep changing the settings options which do indeed make things confusing.

 

What exactly are you trying to shoot? Do you plan on uploading these videos to a website like YouTube? What program do you plan to edit these videos with?

No idea to be honest I have not even thought that far yet

[cws]

>  inserted below 

 

A couple of questions her from me which I dont understand after looking and looking on google. I did find shutter speed vs shutter frame rate which made things clearer but:-

I have seen it written that if you have the camera set to auto for the aps-c / super 35 then movie mode uses super 35 but on myA7r2 that does not happen i need to select it manually am I misunderstanding something?

 

> see your other post

also for XAVCS there are the two choices of 25p 100M and 25p 60M

25 is the frame rate ? is that correct ?

 

> 25fps is the frame rate in PAL (or 50/100fps at high frame rate), 24fps (23.98) or 30fps in NTSC and multiples thereof for higher frame rate, at highest it drops to 720p HD video 

and should be matched to double the shutter speed =1/100 is that correct?

> 25fps is 1/50th sec shutter normally.... the shorter the shutter speed, the less motion blur, but then you need to compensate for loss of light (eg increase ISO, increase lighting, open f-stop)

100M and 60M is the bit rate and 100 M will give a smoother video is that correct? 

>not necessarily "smoother" (that's a conceptual term... many meanings in "video") ... its recording more data per frame so more fine detail will be retained, at the expense of larger file sizes.

if that is then correct then why is there a choice? 

>see previous answer... there are always trade-offs which you'll learn along the way.

I note that on XAVC S HD there is the choice of 50p 25p and 100p all at 50M compared to the XAVCS which only offer 25p

So why is there a choice 3 frame rates avaialble for the XAVC S format?

>  in the HD format.....  25p is 25fps 1920x1080, 50p is (I think) also 1920x1080, 100p drops the resolution to 1280x720p as that's the only way it can get the data off the chip at that high frame rate....   as I said... trade-offs.

Experiment with each setting, only way to truly learn  

Have fun!  

[adwb]

I seem to get jerky or stuttery playback in every mode except MP4. if i use 4 k and dual record the mp4 is smooth but the 4k is very jerky no matter how slowly I pan or  move.

even the auto zoom (digital zoom) is smooth on the MP4 but jerky on the 4K.

 

I have tried various shutter speeds from 1/50 to 1/200 but and lower as well  but it seems the same.

 

 

>  inserted below 

 

Any Ideas what I am doing wrong ?

[cws]

What size is the .mp4 file?  I suspect its a much smaller resolution than the 4k (is it 720p?) and therefore any apparent "jerkiness" will appear to be reduced because of the smaller file size.  However it will still be there as the .mp4 is just a reduced copy of the larger 4k...

Do you have the IBIS on?  Using the sensor's image stabiliser will help smooth your panning motion a little by compensating somewhat for your unsteady hand... 

but generally this is why you use either a tripod for panning, or go to the next (expensive) step which is using a stabilising gimble to smooth out the movement (steadicam is the Pro version).

 

Reducing the shutter speed from say 1/50th to 1/200th for panning is a little like doing a stop-motion movement... where you get a lot of sharp images rather than slightly blurred images.  The slight blurring in fact helps reduce some of the "jerkiness" of a pan....  but to really be smooth you'll need a tripod.

And don't pan too fast (whip-pan) unless that's the effect you intend.  The slower you can pan, the smoother the motion will look.

 

this is all just very basic advice... try doing some research on youtube and the webs... eg 

    Dave Dugdale has some reasonable videos that cover a lot of basic stuff.  There'll be plenty of others as well... eventually might lead you to some of the pro forums like cinematography.net