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โLocate via Metadata
It will simplify your job if you know where the focus pulls are in the shot.
The best way to do that is by pulling the information from the shot metadata, which is why it is important that the metadata be preserved from the original as-shot footage, if possible.
Use the โScript/Metadata/Load focus channel from metadataโ script to import focus data. You can use โFile/Export/Metadata/Export single frameโ to see if focus information is named something else if the original script doesnโt produce anything; use that name to try again.
If youโve been provided with a YAML (.yml) file, typically from a Cooke /i lens, you can import the focus channel from that file with the โFile/Import/- Metadata/Import focus channel from YAMLโ importer.
You can rescale the data as it is read, typically to convert from millimeters to meters (0.001) or feet (0.00328).
In this example, the pull starts around frame 30, and ends sharply at 120. This information doesnโt tell us how the lens scaling is going to change, but it tells us exactly where it will change, and weโll see how to take advantage of that knowledge shortly.
You may also be able to identify pulls from the motion of the camera path, ie an unexpected push in or pull back.
On comparatively static shots, for example hand-held closeups, you may be able to scrub through the shot and visually identify the start and end of focus pullsโthe exact shape shouldnโt be crucial.
If you have a slightly wonky shot where a focus pull is suspected, but it canโt be pulled down, you may have to do a rough solve, see where it is, then pin it down more exactly.
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