[gst-devel] Forcing adder to use audio/x-raw-float

Grant Likely glikely at gmail.com
Fri Feb 4 07:47:40 CET 2005

On Fri, 04 Feb 2005 16:40:39 +0100, Andy Wingo <wingo at pobox.com> wrote:
> Hey Grant,
> On Wed, 2005-02-02 at 14:11 -0700, Grant Likely wrote:
> > I've got an application where I want to force the pipeline to use only
> > audio/x-raw-float when mixing and processing audio.
> Thanks for the test suite. It could be pared down even farther:
> gst-launch sinesrc ! audioconvert ! audio/x-raw-float ! adder ! \
>            audioconvert ! osssink
> The problem is the buffer-frames property. Sinesrc produces buffers of
> indeterminate size, and adder requires that connected elements advertise
> the size of their processing chunks via the 'buffer-frames' caps
> property.

Ah, that explains some of the other weirdness  that I've been seeing
where the order of attaching elements caused the failures to move
> So the solution is to put a buffer-frames element in the pipeline after
> the audioconvert. BUT, for some reason buffer-frames-convert is broken.
> I fixed it in CVS -- don't know how it ever worked before. (Stefan, that
> was your bug -- try again to see if your app is fixed.)

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