Hello,
> > I could fix that crash by commenting out line 450 in src/glwidget.cpp:
> >
> > //self->stopGlsl();
> >
> > But I guess this hides another problem in MLT/Movit. Any idea on this one
> > ?
>
> This change is a cause of more concern. I observe a regression in this area
> between Shotcut 14.12 and 15.01, but it seems to become worse (less
> intermittent) from 15.02 to 15.03. I also notice that this problem does not
> while working on a started playlist or timeline project or when video mode
> is not automatic - because mlt_consumer is not restarted. Technically,
> what it is doing is correct to ensure GL resources are released on the
> proper OpenGL context active on the current thread. There is a concern to
> reuse GL resources created in one context in a new context or to free them
> in a different context. I tried bisecting Shotcut and MLT repos to narrow
> down the problem, but the intermittent nature of it between 14.12 and 15.01
> makes it difficult. Also, it has been difficult to debug. I might just
> comment and revisit it later.
I did some tests in Kdenlive trying to fix this, and here is what I found,
might be helpful to fix the problem:
* The problem vanishes when using the rtaudio consumer instead of the
sdl_audio consumer
* When using the sdl_audio consumer, commenting the lines 788-792 of
glwidget.cpp seems to solve the crash. The problematic lines are:
// Save this frame for future use and to keep a reference to the GL Texture.
m_frame = SharedFrame(frame);
So my guess is that that shared frame holds some data, that at some point
becomes corrupted.
Hope it can help you, regards.
jb
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