[gst-devel] GNonLin + jackaudiosink + Realtime = Strange problem

[Mathis Hofer]

Hi folks

I have a problem with a GNonLin testcase (see attachement) that uses
jackaudiosink for output. You may get the complete tarball including the
audiofiles here: http://www.sendspace.com/file/lbwskh

The problem is as follows:
 1. Using alsasink instead of jackaudiosink works fine.
 2. Using jackaudiosink with jackd _not_ in realtime mode works fine.
 3. Using jackaudiosink with jackd in realtime mode (i.e. 'jack -R ...'
with a large buffer, 2048, to not provoke any performance problems)
results in a problem:
the songs are only played for a few minutes, then it stops during
changing the song. There are no xruns nor does GStreamer get
disconnected by jackd. Also there is no error in the GStreamer debug
output (I use GST_DEBUG=3).

The end of the debug output is:
--------------------
0:07:16.071288000  8087 0x804b008 INFO            GST_STATES
gstelement.c:2141:gst_element_continue_state:<internal-filesource>
posting state-changed READY to PAUSED
0:07:16.071331000  8087 0x804b008 INFO            GST_STATES
gstbin.c:2058:gst_bin_change_state_func:<filesource_6_3> child
'internal-filesource' changed state to 3(PAUSED) successfully
0:07:16.071357000  8087 0x804b008 INFO             GST_EVENT
gstevent.c:840:gst_event_new_seek: creating seek rate 1.000000, format
TIME, flags 11, start_type 2, start 0:05:00.435736941, stop_type 2, stop
0:05:13.173333312
0:07:15.980278000  8087 0x8242080 INFO                  riff
riff-read.c:483:gst_riff_parse_strf_auds:<wavparse107> strf tag found in
context auds:
0:07:16.071570000  8087 0x8242080 INFO                  riff
riff-read.c:484:gst_riff_parse_strf_auds:<wavparse107>  format      1
0:07:16.071584000  8087 0x8242080 INFO                  riff
riff-read.c:485:gst_riff_parse_strf_auds:<wavparse107>  channels    2
0:07:16.071597000  8087 0x8242080 INFO                  riff
riff-read.c:486:gst_riff_parse_strf_auds:<wavparse107>  rate        44100
0:07:16.071609000  8087 0x8242080 INFO                  riff
riff-read.c:487:gst_riff_parse_strf_auds:<wavparse107>  av_bps      176400
0:07:16.071621000  8087 0x8242080 INFO                  riff
riff-read.c:488:gst_riff_parse_strf_auds:<wavparse107>  blockalign  4
0:07:16.071633000  8087 0x8242080 INFO                  riff
riff-read.c:489:gst_riff_parse_strf_auds:<wavparse107>  size        16
0:07:16.071732000  8087 0x8242080 INFO             GST_EVENT
gstevent.c:528:gst_event_new_new_segment_full: creating newsegment
update 0, rate 1.000000, form
at GST_FORMAT_TIME, start 0:00:00.000000000, stop 0:00:12.737596372,
position 0:00:00.000000000
0:07:16.071837000  8087 0x8242080 INFO      GST_ELEMENT_PADS
gstelement.c:628:gst_element_add_pad:<wavparse107> adding pad 'src'
0:07:16.071952000  8087 0x8242080 INFO              GST_PADS
gstpad.c:1759:gst_pad_link_prepare: trying to link wavparse107:src and
src0:proxypad216
0:07:16.071996000  8087 0x8242080 INFO              GST_PADS
gstpad.c:1896:gst_pad_link: linked wavparse107:src and src0:proxypad216,
successful
0:07:16.072014000  8087 0x8242080 INFO      GST_ELEMENT_PADS
gstelement.c:628:gst_element_add_pad:<internal-decodebin> adding pad 'src0'
--------------------

That's where it just "hangs" or better "stops".

I've been able to play a 30-minute audio file through GStreamer with the
same Jack realtime setting without a problem. But I just can't get the
GNonLin test to work with Jack in realtime mode...

I'd be very glad if someone could help me or give me hint how I could
debug this further. I'm getting out of ideas :-/

Regards,
Mathis


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