[Kdenlive-devel] MLT VDPAU and rendering from apps

[Dan Dennedy]

On Thu, Jan 21, 2010 at 7:14 PM, Dan Dennedy <dan at dennedy.org> wrote:
> I wanted to let you know about something with VDPAU in MLT as it
> relates to multiple usage. Basically, when you have a h264 video open
> in the app and using vdpau, then rendering fails - at least if you
> call 'melt' to do the render on my system. I think VDPAU only likes it
> when one app is using it a time. If you add property novdpau=1 to the
> producer (safe to supply even when not h264) then it disables usage of
> VDPAU. For starters, I recommend that apps offer per-clip and/or
> global option to disable VDPAU. Next, I think you should add this
> property to the XML passed to melt for rendering. That should help the
> rendering to succeed when you still have the project open in the app.
> But, make sure you remove that property to the in-memory object tree
> to let the user take advantage of VDPAU (unless VDPAU disabled)! Of
> course, if you just want to be safe and keep support headache to a
> minimum for now, then just always supply novdpau=1 everywhere
> indiscriminately.

I just added support for an environment variable MLT_NO_VDPAU=1 to
disable VDPAU as well. I think that ought to be easier to integrate to
a call to render with melt.

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