add a variable delay to an audio stream

Stefan Kost ensonic at
Tue Jul 19 08:27:58 PDT 2011

On 07/15/11 23:54, Stefano D'Aronco wrote:
> Hi all,
> I know that someone has already asked for this, but I can't find a
> solution.
> I need to introduce in the audio stream of one branch of my pipeline a
> variable delay.
> I try using an audiofirfilter but I think it's not a good solution
> since the kernel of the filter could have even thousands of elements,
> but only the last of them is different from zero. So it seems a waste
> of resources, and also sometimes I get an error while playing. Could
> the error be because the kernel is too big? Or because I modify the
> kernel while playing?
> Could a solution be use a data buffer probe or an identity element in
> order to modify the timestamp of the buffer? But there are two problems:
> gst_buffer_is_metadata_writable tells me that the data is not
> writable, and anyway even if I modify the timestamp I don't get any
> effect.

You would probably need to insert a silent (gap) buffer and modify the

There is also a bug for what sounds a similar request:

personally I'd prefer an element like in
which would work for audio and video. It could (optionally) insert
gap-buffers for padding (when increasing the delay) or drop buffers
(when lowering the delay).


> is there anybody who has had the same problem and has solved it in
> some way?
> Thank you for your help in advance,
> Stefano
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