[gst-devel] problems with adder

[Thomas Vander Stichele]

Hi,

Ronald asked me to tell you that this should be fixed in CVS.

Thomas

On Fri, 2005-02-18 at 10:05 +0100, till busch wrote:
> hi,
> 
> i'm new to gstreamer. i think fail to understand some of its concepts.
> 
> i'm trying to write an app that uses gstreamer for sound output.
> i would like to have gstreamer mix (crossfade) two streams.
> all pipes that i tested so far using gst-launch seem to have some problems.
> mostly these are negotiation problems.
> 
> does anyone have an example how mixing two streams with threads work?
> 
> a working example in c would be great, too.
> 
> in my observation using spider instead of mad seems to work more frequently, 
> though
> i'd like it to work with mad direcltly before switching to spider.
> 
> i have had limited success with this command-line:
> gst-launch-0.8 { filesrc location=Dub_It_Today.mp3 ! mad ! audioscale ! 
> audioconvert ! volume ! queue ! adder0.sink%d } { filesrc 
> location=Nah_Bow_Down.mp3 ! mad ! audioscale ! audioconvert ! volume ! 
> queue ! adder0.sink%d } { adder ! volume ! audioscale ! audioconvert ! 
> alsasink }
> it works quite often, but sometimes it dies like this:
> 
> ERROR: from element /pipeline0/thread2/adder0: Internal GStreamer error: 
> negotiation problem.  File a bug.
> Additional debug info:
> gstadder.c(459): gst_adder_loop: /pipeline0/thread2/adder0:
> width is 0
> Execution ended after 1 iterations (sum 248004000 ns, average 248004000 ns, 
> min 248004000 ns, max 248004000 ns).
> 
> any other approach with less threads (e.g. one for all inputs + adder, and one 
> for the audio-output) did not work.
> 
> thank you for any hints, greetings from burgenland
> 
> - till busch
> 
> 
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