30p and 60i final size question plus a few more

A

accentphotography

Active member
I use a 100B and I am trying to make some two hour recital videos and I was curious if a two hour video shot in 30p would be the same final video image as the same shot in 60i? I use Mac and FCP and in the past fast motion movement on a stage with a black cloth backdrop produced a more noticeable "interlaced" effect when shot in 60i. In the past I used a Sony HVC-1 with 16:9 native CMOS chips. I was never impressed with the sharpness and the ability to keep certain colors from bleeding or ghosting.

Can the 30p capture in motion images as good as 60i in indoor stage events such as dance recitals or stage musicals?

I always felt like something was missing in the final output of the video image to DVD. As much as I try to limit the DVD to two hours and push the DVD Studio Pro to a final file size of about 4.3gb, I am just not happy.

Thanks!
 
well 60i will always result in the interlaced tears that you see when stuff moves sideways...unless you deinterlace it but then you loose half the resolution.

Use 30p or even 24p if you don't want interlacing artifacts.
 
But what about the file size? I have yet to make a 30p video so I have no idea if it is double the information or the same as a 60i would be. Thanks!
 
are you sure you are doing it right?

60i is interlaced but you can't really tell with a human eye unless you freez frame a fast motion.


accentphotography said:
Can the 30p capture in motion images as good as 60i in indoor stage events such as dance recitals or stage musicals?
Click to expand...
I would say 60i looks smother then 30p.
 
It's not clear what you mean by "same file size"... do you mean on the tape? In the editable format? Or in the final (compressed) format?

1) On the tape, the time per tape is the same for 60i and 30p.

2) In the editable (DV) file, the file size is the same. Remember, 30p is the exact same data as 60i, except for the order in which the fields are captured.

3) In the final compressed format (e.g., MPEG2 for DVD), progressive video can be compressed a little more than interlaced video for the same quality. So you CAN choose a lower data rate to get a smaller final file size. But not a huge amount.

Also, having shot a lot of music and dance recitals, I can tell you that 30p works well with a shutter around 1/36; the motion is pretty smooth, the motion blur is pleasant, and the still frames look very nice for either web/printing or for stepping through pedagogically.

-B
 
ryvac said:
are you sure you are doing it right?

60i is interlaced but you can't really tell with a human eye unless you freez frame a fast motion.

I would say 60i looks smother then 30p.
Click to expand...

Especially on todays native-progressive displays (all non-CRT displays), interlacing can be very obvious to the human eye!
 
Thanks for the advice. I will try the 30p and 1/36 shutter speed. Again my original worry was my thinking that somehow 30p took more space in the final render for the DVD. It seems that the older 60i videos that pushed the 2 hour mark on the final output took too much compression for my liking and I did not feel like I was putting out a great video.
 
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