BMRAW SDK, extremely slow to process 1st frame

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hans.lehmann

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  • Joined: Tue Jan 08, 2019 11:18 pm
  • Real Name: Hans Lehmann

BMRAW SDK, extremely slow to process 1st frame

PostTue Jan 08, 2019 11:28 pm

Using the CUDA example in version 1.1 of the Black Magic RAW SDK, the delay between the ReadComplete callback and ProcessComplete is at 10-15 seconds the first time a frame is decoded. Every frame after that seems to run easily in real time. Is this normal behavior? That's a huge delay for a user trying to deal with many clips.

This is on Windows 7, with a GTX1080i and CUDA 8.0
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Cameron Nichols

Blackmagic Design

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  • Joined: Mon Sep 04, 2017 4:05 am

Re: BMRAW SDK, extremely slow to process 1st frame

PostFri Jan 11, 2019 3:59 am

Hi Hans,

Yes there will be some delay as the GPU decoder is dynamically loaded. This will nominally be a few seconds, but I wouldn't expect 10-15 seconds.

If multiple clips share the same IBlackmagicRaw interface, then the delay will only occur when reading the first clip.

Regards
Cameron

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