Some datasets part of UZHFPV fail to build with events.

[nikolaradulov]

Current sets that fail are:

• [ ] datasets/UZHFPV/indoor_forward_6_davis_with_gt.slam

  [################                                  ] 31866 / 105324Could not write frame data
  Failed to serialise frame
  Done.
  dataset-generator: /home/nrad/slambench/framework/tools/dataset-tools/dataset-generator.cpp:197: int main(int, char**): Assertion `res' failed.

• [ ] datasets/UZHFPV/indoor_forward_7_davis_with_gt.slam

  Could not write frame data
  Failed to serialise frame

• [ ] datasets/UZHFPV/indoor_forward_8_davis.slam

  Could not write frame data
  Failed to serialise frame

• [ ] datasets/UZHFPV/indoor_forward_9_davis_with_gt.slam

  Could not write frame data
  Failed to serialise frame

• [ ] datasets/UZHFPV/indoor_forward_10_davis_with_gt.slam

  Could not write frame data
  Failed to serialise frame

  The error seems to point to the Write in Serializer failing:

  bool Serialiser::Write(const void *data, size_t size) {
  return fwrite(data, size, 1, File()) == 1;
  }

  Investigating why. Sets that succeed

• datasets/UZHFPV/indoor_forward_5_davis_with_gl.slam

• datasets/UZHFPV/indoor_forward_11_davis.slam

• datasets/UZHFPV/indoor_forward_12_davis.slam

[nikolaradulov]

Confident issue comes from gray camera not events

[nikolaradulov]

New slamfile construction for event dataset fixes it.