24p native

hi

I already asked around about this and searched some forums but i was unable to get a simple straight forward answer.

i am filming with a canon vixia hv40 and the footage is great for such a camcorder but i dont quite understand the 24p native mode.

i capture the footage with adobe premiere pro cs5 and do everything else in adobe after effects cs5.

first of all the footage is capured in mpeg format. is this normal? isnt it suposed to be capturing in avi format? or is it a hdv thing? because when i used to cature with my previous standard defenition dv camcorder it always captures and renders lossles to avi.

my second question is: what are the correct comp setting (framerate, fields, aspact pixel ratio etc.) in after effects for this type of footage? and do i have to interpert all of the clips seperately?

Reply 1 : 24p native

Since AVI is a container format, it does not dictate the encoding.
MPEG is a type of encoding but most want to bundle other things into a container for their own reasons.

I feel you should give yourself time to learn more about encoding, containers and how such differ. There is NO absolute best here. All are compromises.

The answer to the second question is that such are choices you make. Again there is no one correct answer. If there was then we would not see such options.
Bob

Reply 2 : 24p native

but this is my first hd cam im not used to capturing in mpeg. and from what i know there is indeed a one correct answer because if your footage is 23.98 frames per second and your comp is set to 29.97 it wont play smooth at all. if your footage is progressive and you set the fields to lower or upper it wil display jagged edges. so to get the true footage properties to display there is only one correct setting or a small series of correct settings

Reply 3 : 24p native

If you look at 24 FPS HDTV capable displays your answer may change. For ease of the discussion let's call 23.98 24 and 29.97 30.

If what you said is true and you really believe it, please return the camera fast before you are stuck with it.

However if you are open to a discussion we can discuss why HDTV displays are now showing up with 120 and higher panel rates.
bob

Reply 4 : 24p native

Dear Cherlique,

Let me help you out.

A of this posting- the only cameras that shoot HDV are tape based cameras. HDV refers to a recording standard that has constant frame compression. A camera such as the Canon HV30/40 that shoots on mini DV tapes records HDV footage.

Any HD camera that records to a media card or to an internal hard drive records variable compression video streams (AVCHD). These are similar to HDV only in raster size and frame rate. The actual data in an AVCHD is usually saved in an Mpeg wrapper. So this is normal, but not the case with every single camcorder.)

There is no format standard for consumer camcorders, and there are, in fact, many Standard Def cameras that use AVI as a data wrapper. This was a choice by the manufacturer to ensure more compatibility with some products and less with others. (Yes, it is possible to have DV encoded video inside an AVI wrapper- or inside a Quicktime wrapper. You can also have HDV encoded video within either wrapper. You cannot, however, have AVCHD encoded video inside AVI or QT. The reason is that you need hardware or software reencoders to play the material back.

AVCHD is considered to be an acquisition format only, and is not really suited for mastering edited material.

2. Inside After Effects.
the proper raster is 1440 x 1080 with HDV pixel aspect (as opposed to square pixels. This is only referring to HDV-like pixel sizes- not HDV video.)

I think the frame rate should be set to 23.976. This is the frame rate of Broadcast standard HD footage.
If you open the footage in QT player, and open "info" on it, then QT should tell you the frame rate.

Hope that helps you.

Scott Markowitz

Note: This post was edited by forum moderator to remove unrelated linking (prohibited in these forums) on 03/14/2011 on 10:19 PM PT