60i to 24p/30p video conversion question

[Winsordawson]

I know this may sound trite but I have 60i footage recorded in full hd which I want to upload online without interlacing artifacts. I wish to confirm some knowledge. From what I have read 60i and 30p are identical, because both result in 30 frames per second, either divided or not by frames. But some have wrote that 30p is a better resolution. Is this correct?

If I have 60i footage in hd and wish to convert it to 30p or 24p can I maintain the same resolution, or have to downgrade to 720? So one told me I would have to downgrade it in order to remove the interlace artifacts. I assume this refers to one type of interlace removal (as per 100fps). With something like a bob or bob plus weave I don't have to worry about resolution but it doubles the frame rate (from 25fps to 50fps). So would this double the frame rate of 60i to ...?

I have a mac, so I cannot use virtualdub, etc. But I have premiere and after effects. Which interlace technique do these program use?

Thank you for any help!

[msgohan]

60i aka 30i = 60 individual points in time captured at half resolution
30p = 30 individual points in time captured at full resolution

"Better" is subjective based on whether you want higher temporal resolution (60i) or higher spatial resolution (30p).

But it's all moot now that you have interlaced footage and you want to put it on a video site like YouTube. No matter what you do currently, you will end up with 30p. You can keep it in 1920x1080.

[Winsordawson]

Thank you for your help. But wouldn't 60i and 30p have identical spatial resolution, given your first two sentences? I can understand that 60i would have higher temporal resolution than 30p because 60i can capture motion better. But should the detail be equivalent, just separated into two fields? And I assume this is only true if a proper de-interlacing technique is used.

Also I guess you wouldn't know what de-interlaceing adobe uses?

[msgohan]

No idea about Adobe.

It's not a matter of the same detail level separated into two fields. As soon as anything in frame moves, the fields don't match up. One pair of lines is from a given instant in time and the opposite pair is from the next.