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http://dev.sourcefabric.org/browse/LS-518?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15849#action_15849
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David Baelde commented on LS-518:
---------------------------------
The type system can express this. However, the difficulties caused by
variability would apply even for an operator that only looks at the audio
channel. This is because changing a content layer in a frame is a global
operation for all channel types: if you want to change the video layout you
need to change the global layout. So the operator would have to deal with data
spread over multiple layers.
This makes me think of something trickier, related to the mismatch between
local/precise types and the global/rough layer system. If you take such a
source (assuming we can build one, perhaps by muxing?) and drop the video and
midi channels, you get a ('#a,0,0) but I don't think that the layers will have
been glued back together...
We'll have to discuss this more. I'm not sure how important this is and how we
should address it.
> source('#a,'b,'c) ?
> -------------------
>
> Key: LS-518
> URL: http://dev.sourcefabric.org/browse/LS-518
> Project: Liquidsoap
> Issue Type: Improvement
> Components: Liquidsoap
> Affects Versions: 1.0
> Reporter: Romain Beauxis
> Priority: Important
>
> It may be something that I do not understand. but I think that operators like
> output.ao should require a source of type
> source('#a+1, 'b, 'c)
> i.e. should not have to care about anything concerning video and midi..
> I do not think that the current type system can express it but I may be
> wrong..
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