[FFmpeg-user] Issue with -async parameter (and maybe with asf container)

[Massimo Battistel]

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> Have you been able to reproduce the issue?
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Latest build doesn't fix the issue but this warning appears:

[asf @ 02837900] Using AVStream.codec.time_base as a timebase hint to the
muxer is deprecated. Set AVStream.time_base instead.


MB