HPX250: AVC-Intra 100 vs 50

[Phil1076]

In situations with relatively low motion, and recording at 720 24p, is there a noticeable difference between AVC-I 50 and 100?

 

[Dino]

Color space is 4:2:0, horizontal resolution is sub-sampled to 1440 when shooting at 1080, 960 when shooting 720. I would not be concerned about compression artifacts due to motion.

 

[Phil1076]

So, largely indistinguishable to the average user?

 

[digitalgecko]

I shot AVC-I 50 on the HPX370. I thought the picture looked great. Very happy with the result.

 

[videoatlanta]

To the laymen, probably Not going to notice a difference.

 

[soarprod]

If I remember correctly, the 250 will record native frame rates at 720p30 and p24 so you get extra space savings from that when shooting in AVC100.

 

[Barry_Green]

It also does 1080/24pN so you save a little space (20%) when in 1080/24.

 

[geep]

Mixing 100 & 50

Mixing 100 & 50

I'm wondering if anyone has experience intercutting AVC-I 100 & 50, say 100 for interviews and 50 for scenes? Having shot mostly DVCProHD for the last couple of years, I'm worried about storage needs for a documentary but since the final image will be on large screens, I love the idea of shooting AVC-I 100/1080.

 

[videoatlanta]

Not likely to see the difference - really.

 

[Barry_Green]

AVCI-50 has 4:2:0 color sampling, a lower spatial resolution (1440x1080 instead of 1920x1080), and more compression. I doubt the differences on the big screen will be stark, but if you're going for maximum quality use AVCI-100.

 

[Dino]

The compression ratio difference between Intra 100 and 50 is 12:1 vs. 14:1. So, even though Intra 50 uses half the bit-rate, compression isn't much different due to the 3/4 horizontal sub-sampling and 4:2:0 color space.