A1 pulldown inconsistency

H

Huy Vu

Veteran
I noticed something odd when editing footage with the A1. It was shot in SD 24 (2:3:3:2) pulldown (I checked) and imported into Premiere 2.0 24p timeline. The footage was recognized as 23.976 but there were obvious interlacing throughout, as show from an exported frame.

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I took the footage into After Effects and tell it to guess the pulldown, and it came up with WWWSW (which I believe is the correct one for 2:3:3:2 pulldown) and there is still interlacing. It is not until I select the WWWWS pulldown that the interlacing goes away.

Based on this I believe that Premiere was doing its job correctly and that the A1 is somehow applying different pulldown patterns. What's even more bizarre is that I just finished an entire short film (Versus, which I've posted on here) and if you look at that, there's no interlacing at all. Either I've accidentally changed some setting on the A1 or the camera is randomly applying pulldown patterns when it's recording.

I'll go and get some more test stuff today, but does anyone with more experience on the A1 have any idea what could be causing this? In HDV 24F mode this wouldn't be a problem but I regularly use SD 24p because it's easier to edit.
 
ncje said:
Definetely sounds like something in workflow. Id check premiere forum.
Click to expand...

Nope, definitely not a Premiere issue. After Effect and Premiere use the WWWSW pulldown removal pattern (2:3:3:2). The footage is recognized as 23.976 in Premiere but there's still interlacing, so the only possible explanation is that WWWSW isn't the pattern the A1 applies. I've also uses the exact same workflow for another project just recently and there was no interlacing in that. I've had to switch to shooting 24F HD for the moment because of the seemingly unreliable nature of the SD 24fps mode.
 
hello.

well, i am sorry to say that i cant help you on this. but i am writing here because i have a similar problem...

i am capturing hdv 1080, 50i... and after capture on fcp6 i see very obvious interlacing too....

what causes this? i was hoping someone could explain...

my capture setting is hdv 1080, 50i. should i capture using AIC or prores 422?
 
I've seen this in Premiere Pro as well. Since it seems to render OK, I haven't given it too much thought. I don't do a lot of 24fps work so I can't say for sure but one suspicion I've had is that PPro's playback display runs in 30fps mode even if the time line is 24fps. What makes me wonder that is the playback option for how 24p footage is displayed. One option is for a less accurate pulldown that is less taxing to your h/w. Unless it only applies to 24fps footage in a 30fps timeline, why else would they give that option? It's curious that FCP would exhibit the same behavior.

-Dan
 
TeleDan said:
I've seen this in Premiere Pro as well. Since it seems to render OK, I haven't given it too much thought. I don't do a lot of 24fps work so I can't say for sure but one suspicion I've had is that PPro's playback display runs in 30fps mode even if the time line is 24fps. What makes me wonder that is the playback option for how 24p footage is displayed. One option is for a less accurate pulldown that is less taxing to your h/w. Unless it only applies to 24fps footage in a 30fps timeline, why else would they give that option? It's curious that FCP would exhibit the same behavior.

-Dan
Click to expand...

I used to think that the problem was simply with the preview. In the past, Premiere have shown some wavy lines through the footage that disappears when rendering or when I apply a color correction filter, but in this case the rendered footage is still interlaced, indicating that the pulldown was improperly removed.
 
this can happen if you get a dropped frame during capture. I have received this problem many a time, and the only solution is to recapture after the dropped frame. It could be a problem with the recorded tape, or the reading.
 
teupaksa said:
hello.

well, i am sorry to say that i cant help you on this. but i am writing here because i have a similar problem...

i am capturing hdv 1080, 50i... and after capture on fcp6 i see very obvious interlacing too....

what causes this? i was hoping someone could explain...

my capture setting is hdv 1080, 50i. should i capture using AIC or prores 422?
Click to expand...
You're shooting interlaced. 1080, 50interlaced...

Try something like 25progressive...

There's a lot of information about this on the web.
 
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