Add an example showing simple timeline creation #82
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FYI, I think the code in Issue 42 here must be pretty close. I'm struggling a bit though to adapt this for when there's no If I don't attach the essence itself, I get a |
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I'm struggling getting off the ground here too. I have data that is tape_name, start, length that I'm trying to create a (v1 picture only) AAF from. I get stuck on where the 'start' should be - and get errors when start > length. Commented code below on what I think is occurring - happy for any comments, corrections, clarifications ... (Including pointers as to best approach to find these things in the code)
comp_mob will be the container for the composition that will hold the sequence(s)?
comp_mob now has a 24fps time code track
I think nested_scope is going to be a container for multiple tracks or a submaster sequence?
comp_fill, as yet unused, contains filler
Not sure what happens to comp_fill above track 1
comp_fill added to the sequence
I think the tape_mob identifies a tape source, with a tape_name for relink purposes (as opposed to a 'file' source, that would have a file path for relink purposes)
And tm_clip is a clip based on the tape_mob - with start time code set to 01.00.00.00 @24 fps
But then tm_clip is used in a file_mob so I get confused...
And the master_mob is also necessary?
The fm_clip doesn't have a start time?
But the fm_clip does get appended to the master_mob
and then an mm_clip gets created (why is start time 1 frame early?) and appended to the sequence.
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Hi,
start is the number of frames relative to your clip beginning.
Let’s say your edit rate is 25. And your clip TC in is 00:00:01:00 and TC out is 00:00:11:00
And you want to have in your timeline a sequence of 5 seconds of this clip, then:
if start = 0 and length = 125 (25 * 5), then you will have a “sub clip” of 5 seconds from 00:00:01:00 (TC in + start=0) to 00:00:06:00 (TC in + start=0 + length)
if start = 25 and length = 125, then you will have a "sub clip” of 5 seconds from 00:00:02:00 (TC in + start) to 00:00:07:00 (TC in + start + length)
And in term of structure:
You need to create a Timeline (comp mob)
Then you need to create a timeline slot mob from your timeline
Then you add a sequence (type picture) in your timeline slot mob segment
And then you can add your clips to your sequence
Usually, what I do is: create what i would like in avid.
Export aaf, then inspect/dump it to see the structure and infos.
Hope it helps,
Xavier.
… On 11 Feb 2024, at 09:45, TrevorAyl ***@***.***> wrote:
I'm struggling getting off the ground here too.
I have data that is tape_name, start, length that I'm trying to create a (v1 picture only) AAF from.
I get stuck on where the 'start' should be - and get errors when start > length.
Commented code below on what I think is occurring - happy for any comments, corrections, clarifications ... (Including pointers as to best approach to find these things in the code)
import aaf2
# mocked up dictionary from Layout
maya_seq = {
'aaf_name': 'Layout_Seq_AAF',
'seq_name': 'Layout Send to Edit',
'tracks': [
{
'v_track': 1,
'v_track_name': 'Track 1',
'clips': [
{'name': 'filler', 'frames': 50},
{'name': '960_010', 'frames': 100, 'start': 20, 'tape': '960_010_tape'}
]
},
{
'v_track': 2,
'v_track_name': 'Track 2',
'clips': [
{'name': 'filler', 'frames': 130},
{'name': '960_020a', 'frames': 96, 'start': 1, 'tape': '960_020a_tape'}
]
},
{
'v_track': 3,
'v_track_name': 'Track 3',
'clips': [
{'name': 'filler', 'frames': 130},
{'name': '960_020b', 'frames': 96, 'start': 1, 'tape': '960_020b_tape'}
]
}
]
}
with aaf2.open(maya_seq['aaf_name']+'.aaf', 'w') as f:
edit_rate = 23.976
timecode_fps = 24
comp_mob = f.create.CompositionMob()
comp_mob.usage = "Usage_TopLevel"
comp_mob.name = maya_seq['seq_name']
f.content.mobs.append(comp_mob)
comp_mob will be the container for the composition that will hold the sequence(s)?
tc_slot = comp_mob.create_empty_sequence_slot(edit_rate, media_kind='timecode')
tc = f.create.Timecode(24, True)
tc.start = 86400
tc_slot.segment.components.append(tc)
comp_mob now has a 24fps time code track
nested_slot = comp_mob.create_timeline_slot(edit_rate)
nested_slot['PhysicalTrackNumber'].value = 1
nested_scope = f.create.NestedScope()
nested_slot.segment= nested_scope
I think nested_scope is going to be a container for multiple tracks or a submaster sequence?
for i in maya_seq['tracks']:
sequence = f.create.Sequence(media_kind="picture")
nested_scope.slots.append(sequence)
for j in i['clips']:
if j['name'] == 'filler':
if i['v_track'] <= 1:
comp_fill = f.create.Filler("picture", j['frames'])
comp_fill, as yet unused, contains filler
else:
comp_fill = f.create.ScopeReference("picture", j['frames'])
comp_fill['RelativeSlot'].value = 1
comp_fill['RelativeScope'].value = 0
Not sure what happens to comp_fill above track 1
sequence.components.append(comp_fill)
comp_fill added to the sequence
else:
tape_mob = f.create.SourceMob()
tape_name = j['tape']
tape_slot, tape_timecode_slot = tape_mob.create_tape_slots(tape_name, edit_rate, timecode_fps, media_kind='picture')
tape_slot.segment.length = (j['frames'] + 86400)
f.content.mobs.append(tape_mob)
I think the tape_mob identifies a tape source, with a tape_name for relink purposes (as opposed to a 'file' source, that would have a file path for relink purposes)
file_mob = f.create.SourceMob()
tm_clip = tape_mob.create_source_clip(slot_id=1, start=86400, length=j['frames'])
And tm_clip is a clip based on the tape_mob - with start time code set to 01.00.00.00 @24 <https://github.com/24> fps
# NOTE: if you use the import_dnxhd_essence on master_mob you can skip the file_mobs
file_mob.import_dnxhd_essence(j['name']+".dnxhd", edit_rate, tm_clip)
file_mob.name = j['name']
f.content.mobs.append(file_mob)
But then tm_clip is used in a file_mob so I get confused...
master_mob = f.create.MasterMob()
master_mob.name = j['name']
f.content.mobs.append(master_mob)
And the master_mob is also necessary?
fm_clip = file_mob.create_source_clip(slot_id=1, length=j['frames'])
The fm_clip doesn't have a start time?
print fm_clip.start, fm_clip.length
slot = master_mob.create_picture_slot(edit_rate)
slot.segment.components.append(fm_clip)
But the fm_clip does get appended to the master_mob
mm_clip = master_mob.create_source_clip(slot_id=1, start=(j['start']-1), length=j['frames'])
and then an mm_clip gets created (why is start time 1 frame early?) and appended to the sequence.
sequence.components.append(mm_clip)
# comp_mob.dump()
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Thanks Xavier How are you reviewing the Avid aaf? Is it with aafdump.py? |
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Hi @markreidvfx ,
Amazing work. Thanks so much.
I'm fighting trying to programatically create an AAF audio timeline that I can import into Avid with an AAF.
Essentially, I want to create an AAF with a timeline that references a single clip (perhaps with a couple of cuts). Once imported I want to relink the master clip in the Avid, so the AAF generated clip has got to be imported with a specific name, Tape Id, have 4 audio tracks starting at a specific timecode. I don't want to include the audio binary itself in the AAF though.
Are you able to show an example that does this?
I think it would be a great example for your examples folder because it would be a good starting point for building projects.
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