Public bug reported:
I have a stereo LADSPA plugin I want to use to filter my audio using
gstreamer. Unfortunately, I discovered that gstreamer's gstladspa plugin
can't be naturally used with stereo sound sources. However, I realized
that the interleave and deinterleave plugins can be used to split a
2-channel stream to 2 separate streams, which can be routed to the
LADSPA plugin, and the result can then be reassembled back to 2-channel
audio.
However, there is a bug between the interleave and pulsesink. Given a
suitable 2-channel file, one should be able to reproduce the problem on
a 10.10 installation:
gst-launch-0.10 \
de.src0 '!' queue '!' in.sink0 \
de.src1 '!' queue '!' in.sink1 \
filesrc location="$1" '!' decodebin '!' deinterleave name=de \
interleave name=in '!' audioconvert '!' pulsesink
To parse this out, the fragment is copypasted from shell script. The
filename to play is specified in $1, and is decoded and split to two
channels (it is a stereo file), which are then piped through queue
(which seems to be necessary for some reason) to the interleave sink,
which assembles them together and sends the result to pulsesink.
However, pulsesink rejects this command, saying:
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
ERROR: from element /GstPipeline:pipeline0/GstPulseSink:pulsesink0: Failed to
create stream: Invalid argument
Additional debug info:
pulsesink.c(826): gst_pulseringbuffer_acquire ():
/GstPipeline:pipeline0/GstPulseSink:pulsesink0
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
Freeing pipeline ...
The failure to create stream arises from pa_stream_new() call in
ext/pulse/pulsesink.c. The strange thing is, if I change the sink to
alsasink, the file I specified begins to play, indicating that the
problem must somehow be related to pulsesink. Similarly, if I modify the
last line to something like:
interleave name=il '!' audioconvert '!' flacenc '!' decodebin '!'
pulsesink
also workarounds the problem, for some unfathomable reason.
** Affects: gst-plugins-good0.10 (Ubuntu)
Importance: Undecided
Status: New
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interleave ! pulsesink link doesn't work
https://bugs.launchpad.net/bugs/657457
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