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Portion Of Frames of Video Renders Coming Out Completely Black

mechengineer97mechengineer97 Posts: 116
edited January 2019 in Technical Help (nuts n bolts)

          This has been driving me crazy.  Each time I render a video, there's like a 20 to 30 percent chance that part of the video will come out completely black.  Latest episode of this had the first 1sec coming out completely black and the last 2 seconds rendering fine.  Then when I render it again without changing a thing, it came out fine.  

See attached thumbnails below.

Sometimes it's reversed with the first part coming fine follwed by the remaining video rendering black.  Anyone else have this happening?

demo.mp4_thumbs_[2019.01.30_12.46.34].png
666 x 631 - 411K
walk test better.avi_thumbs_[2019.01.30_12.48.49].png
666 x 631 - 609K
Post edited by mechengineer97 on

Comments

  • Richard HaseltineRichard Haseltine Posts: 102,745

    What happens if you render to an image sequence instead?

  • mechengineer97mechengineer97 Posts: 116

    Thanks for the reply.  Never used image sequence, is there an advantage using a sequence instead of movie mode?

  • Richard HaseltineRichard Haseltine Posts: 102,745

    Several - you get an alpha channel, which can be useful if you are combining with other elements; you can tweak and rrender a few frames if there's a problem, instead of having to rerender the whole sequence; it allows more choice of output format, depending on what your video editing software supports; it allows the addition of a soundtrack; it provides crash-protection - just pick up from the last good frame.

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