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Re: tiff frame sequences and frame rates

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Michael McCune
Re: tiff frame sequences and frame rates
on Aug 31, 2019 at 4:53:23 am

Found it!!! This answers the question of how Resolve knows the frame rate of an imported frame sequence. Also shows other helpful info about the frame sequence, such as dates and times and pixel aspect ratio.

Here is the metadata from a frame, in this case using Media Encoder to create sequences with known frame rates. We encoded the original DPX into a 24.976 fps frame sequence, 24 fps and 29.97 fps.

Using a text editor (Notepad++) and a frame from the 23.976 fps encoding and then searching for '23.976,' we find:
Line 128: xmpDM:videoFrameRate="23.976024"

Also works for other example frames, such as 24 fps. Lines below are 123 to 133. (I expect that these xmp lines and data appear at the same line number location within every frame.)
xmpMM:DocumentID="ab2fb591-9aa3-aa7e-7264-d2ac000000a1"
xmpMM:OriginalDocumentID="xmp.did:c157f6e3-4966-f243-b874-f1159a4a8448"
xmp:MetadataDate="2019-08-30T21:05:36-07:00"
xmp:ModifyDate="2019-08-30T21:05:36-07:00"
xmp:CreateDate="2019-08-30T21:04:47-07:00"
xmpDM:videoFrameRate="24.000000"
xmpDM:videoFieldOrder="Progressive"
xmpDM:videoPixelAspectRatio="1/1"
xmpDM:startTimeScale="24"
xmpDM:startTimeSampleSize="1"
dc:format="TIFF">
And I also see the helpful info about pixel aspect ratio, here clearly indicating it is 1:1. (I had a problem recently in Resolve that seemed related to pixel aspect ratio but could only guess and deduce what the original pixel aspect ratio was. But here it is!!! Plain as day.
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Note, from Wikipedia about xmp:
Extensible Metadata Platform - Wikipedia
https://en.wikipedia.org › wiki › Extensible_Metadata_Platform

The Extensible Metadata Platform (XMP) is an ISO standard, originally created by Adobe Systems Inc., for the creation, processing and interchange of standardized and custom metadata for digital documents and data sets. XMP standardizes a data model, a serialization format and core properties ... for embedding XMP information into popular image, video and document file ...

Mike


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