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Thomas Vander Stichele

gnonlin

Hi guys,

I've been trying various approaches to figuring out what bug I'm running
into when using effects with gnonlin, but I'm failing.

I've boiled it down to a simple test case that you can run on south.mp3
that should make it easy to reproduce the problem.

The script tries to play the last 10 secs of that file, then starts a
second copy of that file from the start 5 seconds after the first, doing
an adder mix for 5 seconds. A third copy is supposed to start a few
seconds before the end of the second.

As you can tell, instead of playing the whole part where the second copy
should be playing alone for 50 seconds, it completely drops the solo
part and jumps to the next mix immediately.

I have no idea what's causing this. When I don't add the effects, while
it obviously doesn't mix correctly, the timing of each of the three
copies is correct.

Edward is telling me that Jokosher is cheating, and that their solution is not really the proper gnonlin way.
Anyone know what the 'proper' gnonlin way is, or is it just not possible today to create a jukebox-type
application with gnonlin ?

Thanks,
Thomas

--
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Like it's some gift you're not the same
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Elisa - future TV today !
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bug.py (2K) Download Attachment

Edward Hervey

Re: gnonlin

Administrator

Hi all,

Managed to find some time to have a look at this, and I'm seeing
different issues.
The provided example can be trimmed even more (by not adding the last
adder and source) and will cause a deadlock (yes !).

The problem I'm seeing is that the first 5s play fine, then the
following 5s are fine too (first source is mixed with second source),
but the it just hangs before switching to the 'second-source-only'.
Digging some more, the problem is that one of the two sources stops
too early, resulting with remaining data in one of the adder's
collectpad, and therefore blocking waiting for the other stream to
produce data.
And that seems to be due to mpegaudioparse aborting too early,
thinking it has sent out enough data for the configured segment. Maybe
Sebastian has a better idea of what's going wrong there.

Since I can't reproduce the exact behaviour, maybe the best at this
point would be to open a bugzilla item along with full debug logs and
report of what behaviour is happening.

Regardless of segments and bugs, I wish you all a merry xmas and/or
end-of-year celebrations,

Edward

On Tue, 2008-12-23 at 12:24 +0100, Thomas Vander Stichele wrote:

> Hi guys,
>
> I've been trying various approaches to figuring out what bug I'm running
> into when using effects with gnonlin, but I'm failing.
>
> I've boiled it down to a simple test case that you can run on south.mp3
> that should make it easy to reproduce the problem.
>
> The script tries to play the last 10 secs of that file, then starts a
> second copy of that file from the start 5 seconds after the first, doing
> an adder mix for 5 seconds. A third copy is supposed to start a few
> seconds before the end of the second.
>
> As you can tell, instead of playing the whole part where the second copy
> should be playing alone for 50 seconds, it completely drops the solo
> part and jumps to the next mix immediately.
>
> I have no idea what's causing this. When I don't add the effects, while
> it obviously doesn't mix correctly, the timing of each of the three
> copies is correct.
>
>
> Edward is telling me that Jokosher is cheating, and that their solution is not really the proper gnonlin way.
> Anyone know what the 'proper' gnonlin way is, or is it just not possible today to create a jukebox-type
> application with gnonlin ?
>
> Thanks,
> Thomas
>
> ------------------------------------------------------------------------------
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel

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Edward Hervey

Re: gnonlin

Administrator

In reply to this post by Thomas Vander Stichele

Small update,

The latest commit to gnonlin should have fixed some more issues if not
all.

Edward

On Tue, 2008-12-23 at 12:24 +0100, Thomas Vander Stichele wrote:

Thomas Vander Stichele

Re: gnonlin

On Sun, 2008-12-28 at 16:40 +0100, Edward Hervey wrote:
> Small update,
>
> The latest commit to gnonlin should have fixed some more issues if not
> all.
>
> Edward

Hi Edward,

thanks for looking at this.

However, even with the update, I still don't get 114 seconds of
continuous audio with the mixes in the proper place using the test
script I gave you.

Are you sure that it works for you ?

Happy newyear,

Thomas

--
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I follow with my eyes till they crash
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http://www.flumotion.net/

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