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Author Topic: Converting night clip from 15p to 25p  (Read 6626 times)

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« on: February 01, 2016, 20:48 »
0
I experimented in converting night clips from original 15p to either 25p or 30p (cannot remember exactly).

SS accepted all and P5 rejected all.

Can anyone comment on why they were rejected or accepted?

Thanks!


« Reply #1 on: February 01, 2016, 21:47 »
+1
It may have nothing to do with the time conversion.

« Reply #2 on: February 01, 2016, 22:35 »
0
It may have nothing to do with the time conversion.

Zeus, thanks for the reply. Could you please tell me whether or not it is a good idea to shoot night clip at 15p and then convert to higher frame rate? I was just experimenting but the results have confused me.

« Reply #3 on: February 01, 2016, 23:38 »
0
It may have nothing to do with the time conversion.

Zeus, thanks for the reply. Could you please tell me whether or not it is a good idea to shoot night clip at 15p and then convert to higher frame rate? I was just experimenting but the results have confused me.
I don't think night footage has much to do with it. I'm wondering which of these you did, if you interpreted the 15 fps to 24 fps so that the final clip was sped up? Or you did some frame adding/blending to get a higher frame rate at a real time speed?

« Reply #4 on: February 02, 2016, 14:26 »
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Peter, it was just a straight conversion from 15p to 25p. Please enlighten me because I don't really know much about video.

« Reply #5 on: February 02, 2016, 15:24 »
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Peter, it was just a straight conversion from 15p to 25p. Please enlighten me because I don't really know much about video.
If you take each frame of a 15 fps (15 frames for one second) clip and play them sequentially on a 30 fps time line, (I'll use 30 because the math is easier) you can see that you are now needing 2 seconds of 15 fps to make up a second of 30 fps timeline. So the viewer sees 2 original seconds in a one second period. It is obviously speeded up. The quality would be good just time-lapsed.

But you could also ask the editor to play the 15 fps in a 30fps time line but keep the 15 fps in real time. Now there needs to be a frame added between every frame you shot to fill in the timeline to make it 30 fps. The quality here is iffy especially if the scene is rapidly changing.

ACS

« Reply #6 on: February 02, 2016, 16:57 »
0
Peter, it was just a straight conversion from 15p to 25p. Please enlighten me because I don't really know much about video.

Which program are you using to convert from 15 to 25?

If you are not speeding up, just converting, than will end up with a choppy, unacceptable footage.

You should't shoot below 24p for stock. And if you shoot 24p send 24, if 25p send 25, if 30p send 30, if 50p you can either send 25 or 50, if 60p send either 30 or 60 for a smooth video.

« Reply #7 on: February 02, 2016, 19:39 »
0
Peter, it was just a straight conversion from 15p to 25p. Please enlighten me because I don't really know much about video.
If you take each frame of a 15 fps (15 frames for one second) clip and play them sequentially on a 30 fps time line, (I'll use 30 because the math is easier) you can see that you are now needing 2 seconds of 15 fps to make up a second of 30 fps timeline. So the viewer sees 2 original seconds in a one second period. It is obviously speeded up. The quality would be good just time-lapsed.

But you could also ask the editor to play the 15 fps in a 30fps time line but keep the 15 fps in real time. Now there needs to be a frame added between every frame you shot to fill in the timeline to make it 30 fps. The quality here is iffy especially if the scene is rapidly changing.

Yes, it looked like time lapse. Thanks again!


 

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