Draft: matroskamux: Delay stream-header until all sink pads have caps
If we don't wait, an incomplete header might be generated due to a race between the _aggregate thread and the sink pad setcaps.
Fixes #3929 (closed)
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If we don't wait, an incomplete header might be generated due to a race between the _aggregate thread and the sink pad setcaps.
Fixes #3929 (closed)