Multiple subs in mp4 make seeking freeze

[Tim-Philipp Müller]

On Mon, 2011-06-13 at 20:01 +0200, Erik Slagter wrote:

Hi Erik,

> Nobody?

Could make a sample file available somewhere and file a bug in bugzilla
(against gst-plugins-good / qtdemux for now) please?

Cheers
 -Tim

> > Hi guys,
> >
> > I am currently trying to find a nasty problem I have been having with
> > gstreamer for ages. Gstreamer is being used in enigma2, a settopbox
> > "gui", which uses gstreamer to play any non-transport-stream media. It
> > does so by using a playbin2().
> >
> > The problem is this: an mp4 file with one (1) subtitle track works like
> > a charm. As soon as more are present, problems come. Sometimes the file
> > plays until the end, sometimes it freezes. If I select the second
> > subtitle track, at least I don't get the subtitles, also sooner or later
> > it freezes as well.
> >
> > The problem of not getting subs after switching sub track can be worked
> > around by seeking to the start of the file and back, as recommended by a
> > developer for older versions of gstreamer. Enigma2 uses 0.10.32 though,
> > which doesn't seem that old to me?
> >
> > But then the freezing is appearing even more. I've done a lot of
> > debugging on the enigma2 source code lately and I now can dismiss any
> > bugs in that code causing this. It's very simple. Every time I activate
> > the second subtitle track ("current-text" = 2), and then do a seek
> > (something like this:)
> >
> > rv = gst_element_seek_simple(GST_ELEMENT(m_gst_playbin),
> > GST_FORMAT_TIME, GST_SEEK_FLAG_FLUSH, 0);
> >
> > The call doesn't return and the pipeline halts after some time.
> >
> > This does *not* happen when subtitle track 1 or no subtitle track is
> > selected. The actual seek position doesn't matter, it always freezes.
> > Also in the meantime no significant messages are delivered to the app.
> > It's just... frozen.
> >
> > Is this a known problem, has this been fixed in newer versions? I can't
> > find any references to this problem, so I guess not.
> >
> > Can somebody try it?
> >
> > Here you can find example files: http://www.xs4all.nl/~erikslag. The -x
> > part describes how many subtitle tracks are present.
> >
> > I also noticed that subtitles of the first subtitle track are delivered,
> > even if no subtitle is actually selected, is this is a known problem?
> > ("current-text" = -1).
> >
> > Thanks for your effort!
> 
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