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Source framerate different from compositions framerate

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Trung Nguyen
Source framerate different from compositions framerate
on Oct 22, 2012 at 8:23:06 pm

Hello,

I have a source footage that was shot using an iPhone 5. When I load it into CS5.5 (getting CS6 soon -don't know if that matters), it has a 30fps. But all of my compositions (ie. gadgets for HUD) that I've previously worked on (just solids, shapes, particles, etc. -no footage) are 29.97 fps. Now, I want to create a new composition (MAIN comp) and put this iPhone5 footage (30fps) and all of my previous gadget compositions (29.97fps) into it. Which of these is recommended?

1. Leave everything as is.
2. Or interpret iPhone5 footage > Conform to 29.97? (Cons: audio maybe out of sync?)
3. Or change ALL of my previous gadget compositions' settings to 30fps?
4. Or any other better method?

The final rendered will be for Youtube and primarily view on a PC.


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Dave LaRonde
Re: Source framerate different from compositions framerate
on Oct 23, 2012 at 2:27:55 pm

You could do ALL the work at 30, render everything -- iPhone audio included -- and THEN conform to 29.97 for the remainder of the work to be done in other applications.

I presume that you've determined beyond any shadow of a doubt that the iPhone footage is indeed 30 and not 29.97 by using applications other than Quicktime Viewer to view the frame rate.

Dave LaRonde
Former Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Trung Nguyen
Re: Source framerate different from compositions framerate
on Oct 23, 2012 at 7:12:45 pm

Here's the media info that Media Player Classic provided for the iPhone5 video:


Format : MPEG-4
Format profile : QuickTime
Codec ID : qt
File size : 64.6 MiB
Duration : 32s 465ms
Overall bit rate : 16.7 Mbps
Recorded date : 2012-10-22T14:22:05-0500
Encoded date : UTC 2012-10-22 19:22:05
Tagged date : UTC 2012-10-22 19:27:25
Writing application : 6.0
Writing library : Apple QuickTime
Model : iPhone 5
Make : Apple

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.1
Format settings, CABAC : Yes
Format settings, ReFrames : 1 frame
Format settings, GOP : M=1, N=30
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 32s 465ms
Source duration : 32s 495ms
Bit rate : 16.6 Mbps
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Rotation : 180°
Frame rate mode : Variable
Frame rate : 29.970 fps
Minimum frame rate : 28.571 fps
Maximum frame rate : 31.579 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.267
Stream size : 64.2 MiB (99%)
Source stream size : 64.3 MiB (100%)
Title : Core Media Video
Encoded date : UTC 2012-10-22 19:22:05
Tagged date : UTC 2012-10-22 19:22:17
Color primaries : BT.709-5, BT.1361, IEC 61966-2-4, SMPTE RP177
Transfer characteristics : BT.709-5, BT.1361
Matrix coefficients : BT.709-5, BT.1361, IEC 61966-2-4 709, SMPTE RP177

Audio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 40
Duration : 32s 463ms
Source duration : 32s 508ms
Bit rate mode : Constant
Bit rate : 64.0 Kbps
Channel(s) : 1 channel
Channel positions : Front: C
Sampling rate : 44.1 KHz
Compression mode : Lossy
Stream size : 249 KiB (0%)
Source stream size : 249 KiB (0%)
Title : Core Media Audio
Encoded date : UTC 2012-10-22 19:22:05
Tagged date : UTC 2012-10-22 19:22:17


Apparently, it's Variable framerate. But when I imported it into After Effects, it became 30 fps.

So are you suggesting that I should make my MAIN comp as 30 fps, put the iPhone5 footage and my other 29.97 comps that I've previously worked on in there, and just work normally? Then at the end, render the whole thing as 29.97?


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Dave LaRonde
Re: Source framerate different from compositions framerate
on Oct 23, 2012 at 7:34:01 pm

It's either that or use a totally different application to conform the frame rate, audio included. Make sure to transcode the footage to a lossless codec, too: you'll note the word "lossy" in there, and you don't want the iPhone pictures to degrade any more than they have to.

Dave LaRonde
Former Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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