Hi all,
I just ran into the same issue in AE 6.
I’m compositing 16 videos into a single frame and occasionally, and unpredictably, a black frame would appear in one of them when I’d render a movie. It’s a one minute video and the black frames would get more frequent as the video went on.
I’d go check the source video in AE, and sometimes (but not always) that black frame would be there. In that case, replacing the footage with itself solved the issue, temporarily.
To anthropomorphize, it seems like sometimes AE just couldn’t find the frame in time while rendering. Maybe this is because the source videos are H.264.
Anyway, Tomas’ suggestion: “set the purging after 20 frames in secret settings in preferences (by holding shift and clicking on general)” definitely helped. The problem has greatly decreased.
Any other suggestions on what else can help?
Thanks
Lev