Editing with 2 different Frames Per Second (Canon 7D)

[Relevent Media]

Hey so I am editing a wedding I recently shot and I have a major issue. It was a 2 camera shoot. I have some clips I shot with a Cannon 7D and the video is in 23frames per second and I shot the other with a Sony AVCHD camera and the video is in 29.97fps, I am wondering which should I convert. Do I drop the fps of the AVCHD footage or up the 7D footage to 29.97... or what?!?! I am yet to start editing. I will either edit in Vegas, Premiere, Final Cut Pro, After Effects.. Thanks any advice is appreciated.

[aedipuss]

choose whichever is going to be the output format framerate as the template to edit with. the 7d is most likely 24p and the sony 30i. is this going to dvd, blu-ray, or online only.

[Relevent Media]

choose whichever is going to be the output format framerate as the template to edit with. the 7d is most likely 24p and the sony 30i. is this going to dvd, blu-ray, or online only.

It will be DVD because they want a copy. That's most important but it will also be on vimeo. I am thinking the 29.97 will be the best since I have majority footage in that frame rate. But what will happen to my 7D stuff will that "jump frames" or convert easily?

[aedipuss]

the 24p should be fine after editing and rendering. standard 3:2 pulldown will be applied, it shouldn't be noticable unless fast action was recorded, which is not usually the case in weddings

[Cornucopia]

If you can't edit separately (one @ 29.97i and one @ 24p), Telecine the 24p to 29.97i, and then join at the end, you'll have to be VERY CAREFUL not to mess up the cadence of the Telecine.

Here's what I'm talking about...

Let's say your cameras were supposed to be "synced" and we're shooting different viewpoints of the same scene, well, you might have this frame sequence for the one camera:

A1o_A1e_B1o_B1e_C1o_C1e_D1o_D1e_E1o_E1e_F1o_F1e_G1 o_G1e_H1o_H1e_Io_Ie_Jo_Je_

(20 fields at 29.97Fps I = 1/3 sec)

The other camera originally had (for the same time period):

A2_______B2_______C2_______D2_______E2_______F2___ ____G2_______H2_______

(8 FRAMES at 24Fps P = 1/3 sec)

This would get changed to:

A2o_A2e_B2o_B2e_B2o_C2e_C2o_D2e_D2o_D2e_E2o_E2e_F2 o_F2e_F2o_G2e_G2o_H2e_H2o_H2e_

(20 fields also)

If you edit anywhere in the between section after B1e/B2e and before E1o/D2o (and many more times after this), you'll have a frame mismatch where you'll get mixed fields on a frame. For example:

A1o_A1e_B1o_B1e_C1o_C1e_|C2o_D2e_D2o_D2e_E2o_E2e_F2o_F2e_F2o_G2e_G2o_H2e_H2 o_H2e_

Notice that you have 2xA, 2xB, 3xC, 3xD, 2xE, 3xF, 2xG, 3xH or 2:2:3:3:2:3:2:3, which is not the standard 2:3:2:3:2:3:2:3.

This can look WEIRD. (like aedipuss was talking about with motion)

Scott

**Note: you'll want to make the 24p into 23.976p to EXACTLY match. However, it may already be 23.976. Best way is to see how many frames occur on each system in a given time period.

[Relevent Media]

Would it matter if I'm not taking any audio from the 7D... Just video no audio?

[edDV]

I agree, since North American color television started, standard practice has been to telecine film (24/23.976) source to 29.97 and then edit 29.97. This is still done for mixed 29.97i and 23.976p source.

The DVD standard and DVD players will accommodate 720x480i telecine source. Most progressive players and/or digital TV sets will inverse telecine the "film" source with little to no motion issues.

If you go the other way, 29.97 interlace to 23.976p there would be serious frame interpolation damage to the 29.97 source.

[edDV]

I also agree that matching cadence is important to prevent edit glitches as the DVD player or digital TV resync cadence. However, modern DVD/HDTV processors will deal with this without too much disturbance.

[aedipuss]

Would it matter if I'm not taking any audio from the 7D... Just video no audio?

it's only the video that matters for fps, i vs. p... audio has a duration, cps, and format.