source_range time uses project framerate instead of the one from the clip

[emcodem]

working with MCP 2024.12.2.
Steps to reproduce: Create a project with different framerate from source clip, cut the clip, export timeline.
Example: Project Framerate: 29.97, clip Framerate: 25, cut away the first second, then export the sequence and load with this code.

in_adapter = otio.adapters.from_filepath(args.input).name
result_tl = otio.adapters.read_from_file(args.input, in_adapter)

main_clip_list = CutClipList()

for track in result_tl.tracks:
    if track.kind != "Video":
        continue

    for item in track:
        if not isinstance(item, otio.schema.Clip):
            continue
        sr = item.source_range
        sr.start_time.value

sr.start_time.value is wrong because it uses the rate of the project, thus the values we get from start_time.to_seconds() are wrong as well.

Is that a bug, or intention or am i doing something wrong?
I tried the latest master version and the latest release. The behaviour is only changed in the sense that the new version works with the actual timecode instead of zero based tc but the framerate is still from the project so its the same.

[rogernelson]

Would you be able to provide a sample AAF file? Thanks.

[emcodem]

25p_sequence_2997_clip_in_at_1_sec_duration_1_sec.zip

This is a 25p sequence and a single 10 second 2997 clip ama linked.
My cuts from perspective of avid timeline: cut first second, leave 2nd second, cut third second, leave 4th second, cut out all the rest until end of clip. Avid displays the 2997 clip in the 25p sequence frame bleneded, e.g. "already" converted to 25fps.
The clip has timecode overlayed, e.g. last visible timecode of second 1 is 00:29

Cut1: First Visile frame 00:00:01:01, last: 00:00:02:00
Start time: 31.0
Duration: 25.0

Cut1: First Visile frame 00:00:03:02, last: 00:00:04:01
Start time: 92.0
Duration: 25.0

Both start time and duration specify 25fps rate as base in OTIO. The Duration Value is ok for me because i set 25 frames duration on a 25fps timeline. The start time 31 in combination with 25fps seems to make no sense for me.

The exact code i use to print the values:

import sys
import os
from aaftimelineparser import CutClipList
sys.path.append(os.path.join(os.path.dirname(__file__), "venv/Lib/site-packages/")) #for e.g. OTIO

import opentimelineio as otio
from opentimelineio.media_linker import MediaLinker
from opentimelineio.schema import ExternalReference
import xml.etree.ElementTree as ET

input_file = sys.argv[1]

in_adapter = otio.adapters.from_filepath(input_file).name
result_tl = otio.adapters.read_from_file(input_file, in_adapter)

for track in result_tl.tracks:
    if track.kind != "Video":
        continue

    for item in track:
        if not isinstance(item, otio.schema.Clip):
            continue
        sr = item.source_range
        print (sr.start_time.value)
        print (sr.duration.value)