[gstreamer-bugs] [Bug 453650] New: Two alsasrcs do not work in one pipeline

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | don't know | Ver: 0.10.13
           Summary: Two alsasrcs do not work in one pipeline
           Product: GStreamer
           Version: 0.10.13
          Platform: Other
        OS/Version: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: don't know
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: v.mayatskih at gmail.com
         QAContact: gstreamer-bugs at lists.sourceforge.net
     GNOME version: Unspecified
   GNOME milestone: Unspecified


Please describe the problem:
I need to join streams from two soundcards and mux it with some video. I have
built a sample pipeline with one soundcard and it works fine:

gst-launch -v videotestsrc num-buffers=100 ! ffmpegcolorspace ! ffdeinterlace !
tee name="tee0" ! fakesink \                                                
    tee0. ! queue ! ffenc_h263p ! tee name="tee1" ! fakesink \                  
    tee1. ! queue ! matroskamux name="mux" ! filesink location="/tmp/1.mkv" \   
    alsasrc device="hw:0" ! "audio/x-raw-int,width=16,rate=48000,channels=2" !
adder name="mix" \                                                           
    ! tee name="tee2" ! ffenc_ac3 ! tee name="tee3" !
"audio/x-ac3,width=16,rate=48000,channels=2" ! mux. \                           
    tee3. ! queue ! fakesink

When I add a second card (even without linking to the 'adder' element) then
pipeline stops

    alsasrc device="hw:1" ! "audio/x-raw-int,width=16,rate=48000,channels=2" !
fakesink

The error is:

Setting pipeline to PLAYING ...
0:00:00.231934000 15579 0x804f050 WARN              pipeline
gstpipeline.c:568:gst_pipeline_change_state:<pipeline0> error: Selected clock
cannot be used in pipeline.
0:00:00.232189000 15579 0x804f050 WARN              pipeline
gstpipeline.c:568:gst_pipeline_change_state:<pipeline0> error: Pipeline cannot
operate with selected clock
ERROR: pipeline doesn't want to play

In my C-program with only one alsasrc I have to manually set pipeline's clock
(got it from alsasrc) and it works, but I didn't find the way how two alsasrc
can work together.

Steps to reproduce:
Run pipeline with two alsasrc


Actual results:
Got error: Pipeline cannot operate with selected clock

Expected results:
Two alsasrc should work both together

Does this happen every time?
yes

Other information:


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