A1 video - different file sizes with the same frame rate?

[MtnView]

Hi All,

Taking another dive on trying to understand the video settings on my camera. Here is my question

I have the Rec. Frame Rate set to 30p. When I look at the recording settings, I see the following three options:

• 140M 4:2:2 10bit
• 100M 4:2:0 8bit
• 60M 4:2:0 8bit

I don't understand the difference between the second two options. if they are both at 4:2:0 8bithy. Why are there two different file sizes?

This is also true for the 24p frame rate.

Thanks!

Roger

 

[daran]

I have the Rec. Frame Rate set to 30p. When I look at the recording settings, I see the following three options:

• 140M 4:2:2 10bit
• 100M 4:2:0 8bit
• 60M 4:2:0 8bit

I don't understand the difference between the second two options. if they are both at 4:2:0 8bithy. Why are there two different file sizes?

That is the amount of data per second that the compressor is allowed to use. Similarly to JPEGs, if the compressor has to reduce the data further, more fine details will be lost. In this case it may be hard to see a difference unless your subject is finely detailed.

 

[MtnView]

Thanks!

 

[AlephNull]

Another variation is whether it is inserting full frames or just deltas. If every frame is a full frame, then editing is far easier - you can start from any place in the clip. If there are lots of deltas, then the editing software has to find a full frame before your cur point, then "play" the deltas to construct the frame at your cut.

Putting in lots of full frames makes the file bigger (unsurprisingly - storing just deltas is a key part to getting the files smaller).

 

[MILC man]

Hi All,

Taking another dive on trying to understand the video settings on my camera. Here is my question

I have the Rec. Frame Rate set to 30p. When I look at the recording settings, I see the following three options:

• 140M 4:2:2 10bit
• 100M 4:2:0 8bit
• 60M 4:2:0 8bit

I don't understand the difference between the second two options. if they are both at 4:2:0 8bithy. Why are there two different file sizes?

beyond the good advice that was already given, i'd add that knowing when you are shooting h.264 vs. h.265 can make a difference in how easily the footage is handled in post... as i understand it:

xavc-hs = h.265 = hevc

xavc-s = h.264, the older and less complex codec, so easier to edit but potentially weaker p.q., at a given bitrate

 

[MtnView]

Hi All,

Taking another dive on trying to understand the video settings on my camera. Here is my question

I have the Rec. Frame Rate set to 30p. When I look at the recording settings, I see the following three options:

• 140M 4:2:2 10bit
• 100M 4:2:0 8bit
• 60M 4:2:0 8bit

I don't understand the difference between the second two options. if they are both at 4:2:0 8bithy. Why are there two different file sizes?

beyond the good advice that was already given, i'd add that knowing when you are shooting h.264 vs. h.265 can make a difference in how easily the footage is handled in post... as i understand it:

xavc-hs = h.265 = hevc

xavc-s = h.264, the older and less complex codec, so easier to edit but potentially weaker p.q., at a given bitrate

This is alphabet soup to me!

I'm just trying to get decent video quality for my daughter's horse-riding events. Think "iphone quality, but a better lens for zooming". I think(!) I could get by with xavc s hd with 16M 4:2:0 8bit, no?

 

[MILC man]

one of the xavc-s choices would be the easiest, how are you going to edit it?

 

[MtnView]

I'm using Wondershare. It was something that was easy to start with. It seems to be working ok with that format.

Thanks,

Roger

 

[MILC man]

since running horses are action, i'd shoot it at 60p, and if it's outside think about keeping the aperture under control with an nd filter.

i've been experimenting with video on the a1/200-600 in crop mode, because i need the narrow fov... manual mode, 4kp60, 1/120th, f/9 or wider.

 

[MtnView]

since running horses are action, i'd shoot it at 60p, and if it's outside think about keeping the aperture under control with an nd filter.

i've been experimenting with video on the a1/200-600 in crop mode, because i need the narrow fov... manual mode, 4kp60, 1/120th, f/9 or wider.

Thanks for the tips! I've landed on something close, except I'm trying 4K vs HD to see if it is worth 4x the storage.

Also, how does "crop" impact "active steady shot"? What is the advantage of using crop?

Finally, I'm using Picture Profile #11, and using either ISO 125 or 640. I saw that in a video from Mark Smith...

Thanks again,

Roger

 

[MILC man]

i'm shooting crop mode for distant targets, in order to get a similar fov to what the 1.4x tc has, the metadata says that it's equivalent to 944mm... it's also oversampled, so in good light the p.q. can be better than shooting ff video.

i really don't need ff light when shooting under the sun, if anything i'm trying to cut it down with an nd8 filter, which is perfect for f/9, but i really want to be shooting wide open at f/6.3... so manual mode with fixed aperture/shutter speed, floating the iso, i'm on a tripod so stabilization is turned off for now.

the free sony catalyst browse software can play the footage back, it uses some video card acceleration and it shows the metadata... pp11 is s-cinetone, i use it because i don't want to color-grade the footage.

S-Cinetone-whitepaper_v2.pdf (pro.sony)