mpegtsmux: Don't time out in live mode if no timestamped next buffer is available
The muxer can only advance the time if it has a timestamped buffer that can be output, otherwise it will just busy-wait and use up a lot of CPU.
Fixes #3912 (closed)
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The muxer can only advance the time if it has a timestamped buffer that can be output, otherwise it will just busy-wait and use up a lot of CPU.
Fixes #3912 (closed)