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26 lines
1.2 KiB
Markdown
26 lines
1.2 KiB
Markdown
---
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title: Writing a N-to-1 Element or Muxer
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...
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# Writing a N-to-1 Element or Muxer
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N-to-1 elements have been previously mentioned and discussed in both
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[Request and Sometimes pads][request-pads] and in
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[Different scheduling modes][scheduling]. The main noteworthy
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thing about N-to-1 elements is that each pad is push-based in its own
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thread, and the N-to-1 element synchronizes those streams by
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expected-timestamp-based logic. This means it lets all streams wait
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except for the one that provides the earliest next-expected timestamp.
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When that stream has passed one buffer, the next
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earliest-expected-timestamp is calculated, and we start back where we
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were, until all streams have reached EOS. There is a helper base class,
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called `GstCollectPads`, that will help you to do this.
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Note, however, that this helper class will only help you with grabbing a
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buffer from each input and giving you the one with earliest timestamp.
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If you need anything more difficult, such as "don't-grab-a-new-buffer
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until a given timestamp" or something like that, you'll need to do this
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yourself.
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[request-pads]: plugin-development/advanced/request.md
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[scheduling]: plugin-development/advanced/scheduling.md
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