[vlc-devel] [PATCH] Restart buffering instead of flushing.

Jean-Paul Saman jpsaman at videolan.org
Wed Jan 30 14:27:24 CET 2013

On Wed, Jan 30, 2013 at 10:45 AM, Rafaël Carré <funman at videolan.org> wrote:

> Hello,
> Le 29/01/2013 12:25, Jean-Paul Saman a écrit :
> > Now with patch attached.
> >
> > On Tue, Jan 29, 2013 at 11:33 AM, Jean-Paul Saman <jpsaman at videolan.org
> >wrote:
> >
> >> A long time irritation in vlc since the 1.0.x days is that when the
> buffer
> >> delay is adjusted vlc trashes all data currently in its buffers. Thereby
> >> introducing visual artefacts in the playback
> What happens when playing from a slow network ?

The current dynamic buffering adjusts the PTS delay and empties the current
decoder buffers. This
introduces the visual artefacts, since stream data is thrown away. This is
regardless of network speed
or disk speed.

What should happen IMHO is that the buffer PTS delay value should be
without emptying the decoder buffers. The user would see a pause,
additional buffering happen and continue
of playback at the exact point where it paused. In this case no visual
artefacts should be seen (caused by buffering).

> >> The attached patch is a first attempt on solving this. It is not perfect
> >> yet, since when updating the clock jitter lipsync can be lost. And not
> >> updating clock jitter but pausing for buffering restarts and unpausing
> >> afterwards seems to keep lipsync.

Pausing before restarting buffering is a workaround for loosing lipsync and
not updating the PTS jitter delay is
actually wrong here. When calling es_out_SetJitter() lipsync is lost.

> >> The question is how to update the clock jitter and keeping lipsync? I do
> >> not have an answer yet and hope one of our core developers has an idea.
> >>  0001-Decoders-Restart-buffering-without-flushing.patch <
> http://undefined>
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kind regards,

Jean-Paul Saman
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