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.
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