Black frames with nested project with mpeg file & velocity envelope.
 

Please, can you download this file (VP9) and make a render of “Master Project.veg” (no matter the codec).

Personnaly, I get many, many, many... black frames. (both in preview and render).

Any idea about what can cause this ?
TIA
Gilles

ps1: Mpeg file come from a Sony DCR-SR190E camcorder.
ps2 : same result with VP8