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switching between subpipelines

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Albert Costa

switching between subpipelines

Hello people,

I am writing/testing to build a small application where I have 2 possible source pipelines for a sink. For example, I would have (if I translate to command line):

gst-launch filesrc location=myfile.avi ! decodebin ! ffmpegcolorspace ! directdrawsink and at some time I want to switch to videotestsrc ! ffmpegcolorspace ! directdrawsink (and vice-versa)

That is, I either get my frames from the (filesrc+decodebin) or the (videotestsrc) elements.

Is there a way to keep 2 such 'subpipelines' created, while only one is currently linked to the sink?

- If I create and add all the elements to the main pipeline but only link one branch, I get ofcourse a 'nonlinked' error for the other branch.

- If I create all, but only add the branch I use (with gst_bin_add_many), then remove the branch (with gst_bin_remove_many) and add the new one it works. But if I want to revert again, then the elements that got removed in the first place cannot be added again.

Is there a way to keep a bunch of elements such that I can add/remove them from the pipeline anytime I want (without having to recreate them) ?

Best Regards,

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Eric Zhang-6

Re: switching between subpipelines

Hi, gstreamer-devel:

Seems `input-selector' is a choice -- a N-to-1 stream selectoring element.

Eric Zhang

2008/11/13 Albert Costa <[hidden email]>

Hello people,

I am writing/testing to build a small application where I have 2 possible source pipelines for a sink. For example, I would have (if I translate to command line):

gst-launch filesrc location=myfile.avi ! decodebin ! ffmpegcolorspace ! directdrawsink and at some time I want to switch to videotestsrc ! ffmpegcolorspace ! directdrawsink (and vice-versa)

That is, I either get my frames from the (filesrc+decodebin) or the (videotestsrc) elements.

Is there a way to keep 2 such 'subpipelines' created, while only one is currently linked to the sink?

- If I create and add all the elements to the main pipeline but only link one branch, I get ofcourse a 'nonlinked' error for the other branch.

- If I create all, but only add the branch I use (with gst_bin_add_many), then remove the branch (with gst_bin_remove_many) and add the new one it works. But if I want to revert again, then the elements that got removed in the first place cannot be added again.

Is there a way to keep a bunch of elements such that I can add/remove them from the pipeline anytime I want (without having to recreate them) ?

Best Regards,

Al

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Arnout Vandecappelle

Re: switching between subpipelines

In reply to this post by Albert Costa

On Wednesday 12 November 2008 18:29:35 Albert Costa wrote:
> If I create all, but only add the branch I use (with gst_bin_add_many),
> then remove the branch (with gst_bin_remove_many) and add the new one it
> works. But if I want to revert again, then the elements that got removed in
> the first place cannot be added again.

When you remove elements from the pipeline, they are unlinked and unreffed.
Probably you didn't ref them before adding to the pipeline, so they'll be
destroyed. So, you'd have to first ref them, then remove from the pipeline;
when adding, first add them, then link them again, then unref them. Or, of
course, you can ref them once in the beginning and keep them alive all the
way to the end. Oh, and before you do any of that you'll have to set the
element's state to NULL (or is READY sufficient?).

That said, removing them from the pipeline isn't really the solution you
want. You'd better pause the branch that is inactive, then link the tail to
the other branch. There's no need to remove elements from the pipeline at
all.

But of course, input-selector is much simpler :-)

Regards,
Arnout
--
Arnout Vandecappelle arnout at mind be
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