Possibility to define Crops for Clips?

[philipph77]

Hi,
for my current otio project, I have clips of varying aspect ratios. Thus, in my current workflow I am first rescaling and cropping all clips to the right size, exporting them as files and then linking them against the otio timeline. Of course, cropping and exporting all clips takes a lot of time.
Thus, I was wondering:
Is there a way to define a crop (and rescaling factor) for a clip, so that cropping could be done in a final video exporting step?

Here is some sample code in Python showing how I image doing this:

cl = otio.schema.Clip(
    name=clipname,
    media_reference=otio.schema.ExternalReference(
        target_url=clip_file,
        available_range=otio.opentime.TimeRange(
            start_time=otio.opentime.RationalTime(0, clip_fps),
            duration=otio.opentime.RationalTime(clip_duration*clip_fps, clip_fps),
        )
    ),
    source_range=otio.opentime.TimeRange(
        start_time=otio.opentime.RationalTime(0, clip_fps),
        duration=otio.opentime.RationalTime(clip_duration*clip_fps, clip_fps),
    ),
    crop_details = (
        coordinates = (left_coordinate, right_coordinate, bottom_coordinate, top_coordinate),
        rescaling_factor = rescaling_factor,
    )
)

[apetrynet]

Hi, @philipph77

"All" otio objects have a metadata dictionary that are perfect for these kind of things. It's considered best practice to put your data under your application or studio name so the metadata doesn't cause issues in other applications or risk getting overwritten.

example:

cl = otio.schema.Clip(
    name=clipname,
    media_reference=otio.schema.ExternalReference(
        target_url=clip_file,
        available_range=otio.opentime.TimeRange(
            start_time=otio.opentime.RationalTime(0, clip_fps),
            duration=otio.opentime.RationalTime(clip_duration*clip_fps, clip_fps),
        )
    ),
    source_range=otio.opentime.TimeRange(
        start_time=otio.opentime.RationalTime(0, clip_fps),
        duration=otio.opentime.RationalTime(clip_duration*clip_fps, clip_fps),
    )
)
crop_details = {
    "coordinates": (left_coordinate, right_coordinate, bottom_coordinate, top_coordinate),
    "rescaling_factor": rescaling_factor
}
cl.metadata['my_application'] = crop_details