[gstreamer-bugs] [Bug 609689] New: compositions containing gnloperation videomixer/adder freeze when input is another gnloperation

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=609689
  GStreamer | gnonlin | 0.10.13

           Summary: compositions containing gnloperation videomixer/adder
                    freeze when input is another gnloperation
    Classification: Desktop
           Product: GStreamer
           Version: 0.10.13
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gnonlin
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: brandon_lewis at alum.berkeley.edu
         QAContact: bilboed at gmail.com
      GNOME target: ---
     GNOME version: ---


I think I have found a bug in GNonlin which manifests itself when you have a
composition arranged like this:

[gnloperation: videomixer]
[gnloperation: anything]
[gnlsource]
...

Judging from the output of the debug log, the composition seems to go into an
infinte loop when it tries to connect the under-operation to the videomixer
(see attached: doesnt_work.py). Indeed, the last 60% of a 28-meg debug log is
just the following repeating lines:

0:00:13.042037909  7078  0x8bc09a8 LOG           gnlcomposition
gnlcomposition.c:1241:convert_list_to_tree:<gnloperation1> operation,
num_sinks:1
0:00:13.042113268  7078  0x8bc09a8 DEBUG         gnlcomposition
gnlcomposition.c:1213:convert_list_to_tree: object:gnlsource0 ,
*start:0:00:02.500000000, *stop:0:00:05.000000000 highprio:3
0:00:13.042188906  7078  0x8bc09a8 DEBUG         gnlcomposition
gnlcomposition.c:1258:convert_list_to_tree:<gnlsource0>
*start:0:00:02.500000000 *stop:0:00:05.000000000 priority:3
0:00:13.042271947  7078  0x8bc09a8 DEBUG         gnlcomposition
gnlcomposition.c:1258:convert_list_to_tree:<gnloperation1>
*start:0:00:02.500000000 *stop:0:00:05.000000000 priority:3
0:00:13.042349611  7078  0x8bc09a8 DEBUG         gnlcomposition
gnlcomposition.c:1258:convert_list_to_tree:<gnloperation2>
*start:0:00:02.500000000 *stop:0:00:05.000000000 priority:3
0:00:13.042771312  7078  0x8bc09a8 DEBUG         gnlcomposition
gnlcomposition.c:1213:convert_list_to_tree: object:gnloperation2 ,
*start:0:00:02.500000000, *stop:0:00:05.000000000 highprio:3
0:00:13.042916792  7078  0x8bc09a8 LOG           gnlcomposition
gnlcomposition.c:1241:convert_list_to_tree:<gnloperation2> operation,
num_sinks:1
0:00:13.042998366  7078  0x8bc09a8 DEBUG         gnlcomposition
gnlcomposition.c:1213:convert_list_to_tree: object:gnloperation1 ,
*start:0:00:02.500000000, *stop:0:00:05.000000000 highprio:3
0:00:13.043073795  7078  0x8bc09a8 LOG           gnlcomposition
gnlcomposition.c:1241:convert_list_to_tree:<gnloperation1> operation,
num_sinks:1
0:00:13.043146849  7078  0x8bc09a8 DEBUG         gnlcomposition
gnlcomposition.c:1213:convert_list_to_tree: object:gnlsource0 ,
*start:0:00:02.500000000, *stop:0:00:05.000000000 highprio:3

My guess is that this has something to do with the fact that videomixer accepts
an arbitrary number of inputs, because you can stack as many single-input
operations together as you like (see attached: works.py). You can also stack as
many single-input operations as you wish on top of a videomixer (see attached:
also-works.py).

You might be wondering at this point if this is also the case with adder, and
the answer is yes (see attached: audio_works.py and audio_doesnt_work.py)

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