I am wondering that streamsynchronizer is only for 1-video and 1-audio and 1-text

[Sebastian Dröge]

On Mo, 2013-10-07 at 03:38 -0700, HoonHee Lee wrote:
> I am trying to play multiple stream with streamsynchronizer and
> streamid-demuxer (https://bugzilla.gnome.org/show_bug.cgi?id=707605)
> 
> [...]
> 
> 
> Without streamsynchronizer, this test-code working fine with creating
> sine.ogg and pink.ogg
> When I tried to use streamsynchronizer, there is a blocking issue with this
> function.
> 
> static gboolean
> gst_stream_synchronizer_sink_event (GstPad * pad, GstObject * parent,
>     GstEvent * event)
> {
> ...
>   switch (GST_EVENT_TYPE (event)) {
>     case GST_EVENT_STREAM_START:
>     {
>      ...
>      for (l = self->streams; l; l = l->next) {
>           GstStream *ostream = l->data;
> 
>           *all_wait* = all_wait && ostream->wait && (!have_group_id
>               || ostream->group_id == group_id);
>           if (!all_wait)
>             break;
>         }
>     ...
>     case GST_EVENT_SEGMENT:{
>     ...
>     if (stream) {
>         if (stream->wait) {
>           *GST_DEBUG_OBJECT (pad, "Stream %d is waiting",
> stream->stream_number);*
>           g_cond_wait (&stream->stream_finish_cond, &self->lock);
>           stream = gst_pad_get_element_private (pad);
>           if (stream)
>             stream->wait = FALSE;
>         }
>       }
>       ...
> }
> 
> When second stream-start event is coming, In GST_EVENT_STREAM_START,
> "all_wait" is not set as TRUE,
> so, in GST_EVENT_SEGMENT, stream->wait is not set FALSE and then "Stream %d
> is waiting" message is printed and waiting continuously.
> 
> I am wondering that streamsynchronizer is only for 1-video and 1-audio and
> 1-text not multiple streams such as 2-audio stream.

It works for multiple audio/video/subtitle streams too. The problem for
you here is that streamsynchronizer detects that a stream is changing
(i.e. the same sinkpad of it gets a new stream). Then it waits for all
other streams (the other sinkpads) to finish first.

A stream change is detected by streamsynchronizer by looking at the
group ids of the stream-start event. (Or if no group id is set, in which
case your code should be fixed, it will compare the sequence numbers of
the stream-start event).
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