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jim stamos
shooting 720p vs 1080/ on ex3
on Nov 5, 2010 at 6:24:37 pm

ive heard alot shoot in 720p instead. any particular reason why? how much recording time for this on a 32gig card. im told that if youre going to downconvert this to final SD DVD , to go with 720.
input?


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Craig Seeman
Re: shooting 720p vs 1080/ on ex3
on Nov 5, 2010 at 6:46:20 pm

Data rate is the same regardless.

There are some arguments although there's debate on different sides of the issue.

Some say
720p looks better than 1080 when downconverting to SD
720p60 has same temporal motion of 1080i60 but it's progressive and some argue slightly higher resolution since 720 lines are displayed in 1/60 instead 540 in 1/60 of a second (1 field of 1080)
720p24 allows for overcranking (slow motion).

Some would also argue
1080 is higher resolution and downconverting to SD with proper care will hold up too
1080 gives more flexibility if you actually edit in an SD time line since you can pan and zoom (fake track and dolly) and reposition shots.

I'm sure others will bring up other points on both sides.



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Clint Fleckenstein
Re: shooting 720p vs 1080/ on ex3
on Nov 5, 2010 at 8:22:16 pm

One thing I've wondered about, since bitrate is a constant (well, it's VBR, but it is 35Mb regardless of format) ... don't you get a lot more compression on 1080p? In which case, perhaps you'd get sharper motion etc. from a 720p30 frame than 1080. I haven't done any comparisons but I'm curious if anyone has. All other factors aside it'd be interesting how compression comes into play in the 720 vs 1080 discussion.

Cf


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Craig Seeman
Re: shooting 720p vs 1080/ on ex3
on Nov 5, 2010 at 9:30:45 pm

Yes actually you can get more bits per pixel in 720 than 1080 but I've heard some have tested and found no visible difference. Don't forget the data rate is over time so 720p24 would be more bits for each frame as well compared to 60 anything.

BTW this is also why 720p24/60 overcrank is better than shooting 720p60 and simply reflagging to play in 24fps timeline. 720p24/60 is actually recording at about 87.5Mbps so that when played back at 24fps it's about 35Mbps. That's also why overcranking created fails on most SDHC until the new firmware (which I suspect increases buffering on the card and why the card run times are slightly shorter).

Straight 720p60 at 35Mbps is down to 14Mbps if flagged for 24fps (2.5 is the multiplier/divider). That doesn't necessarily mean you'll see the difference though but I'd thought I'd point out what I believe to be the math involved.



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John Young
Re: shooting 720p vs 1080/ on ex3
on Nov 8, 2010 at 4:26:03 pm

I also find that in certain situations shooting in 1080 for a 720 project provides a lot of flexibility.
For example, I am a one-man video production department for a manufacturing company and most the videos we produce here at my company are made specifically for the web. So sometimes 720 is high enough quality for the final output. I really like stable shots and sometimes even a stable handheld shot is too much movement for my liking. But because we are limited on budget and therefore equipment, I will often shoot in 1080 to allow for image stabilization before scaling down to 720. Like when I need to shoot low to the ground, and we can't afford a hi hat, or when shooting very fast and I don't have time to mess with tripod, and have to go handheld. That way when I do image stabilization in After Effect on the 1080 image, I don't have to scale the image up and lose resolution.

http://www.johnathanyoung.com


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