vaav1enc: Change the alignment of output to "tu"
The current output alignment is "frame", which may cause some issues for PTS and DTS calculation. We now change the alignment to "tu", and this is also the alignment mode for av1enc and svtav1enc.
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The current output alignment is "frame", which may cause some issues for PTS and DTS calculation. We now change the alignment to "tu", and this is also the alignment mode for av1enc and svtav1enc.