CEP and multi-stream files: how to know which stream a clip points to

[alpacawool]

Hi, I'm working with a MXF file that contains three streams: 1 video track, 2 audio tracks. Premiere creates three clips when I drag the MXF file over the sequence window: one for the video, two for the audio: so far so good.

At this point I need to determine which audio stream *in the original MXF file* the two audio clips refers to. In other words: given an audio clip on the timeline, I want to know which audio stream it points to in the MXF. 

I could not find such info in the clip object (app.project.activeSequence.audioTracks[...]...). I got very close by querying ProjectItem.getAudioChannelMapping, but it only tells me how many clips are associated to the project item. 

Any clues? Thanks in advance

[Bruce Bullis · Accepted solution]

There's no good way to accomplish that, using PPro's ExtendScript API.

[alpacawool]

Thanks @Bruce Bullis for the reply. Too bad this is not possible. More generally, is there a way to obtain the audio from a clip? The actual data, I mean. That would solve the problem I'm facing right now. 

[Bruce Bullis]

Only C++ Exporter plug-ins transcoding (not encoding, as in a sequence) would get access to the non-interpreted, non-filtered, original audio data.

Tell me more about the workflow(s) you'd like to support, and I may be able to provide better guidance.