[vlc-devel] [RFC PATCH 09/13] FIXUP: implement audio/video/spu delay

Rémi Denis-Courmont remi at remlab.net
Sat Jul 7 21:22:07 CEST 2018

Le lauantaina 7. heinäkuuta 2018, 19.22.11 EEST Denis Charmet a écrit :
> Now the issue is that, as Thomas said is that most of the hw decoders
> with which I've workded, do care about PTS to compute their own
> discontinuities/hurryup and other internal magics.

I don't see how a constant shift on the timestamp of an ES would affect the 
decoder. Timestamps are only meanignful relative to one another, not as 
absolute values.

In fact, it's already broken if it does not, as TS and RTP ES's don't start at 

> Do we apply said delays to dts?

I would certainly think so.

Now the problem is when the user changes the delay. Obviously the postponed ES 
will have to "pause" while the other catches up, or the advanced ES will have 
to "skip" forward to catch up. AFAIK, it already necessarily works that way.


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