Tlt-converter -i flag purpose

No, the tlt-converter will not do that.

Please refer to How to run tlt-converter
For example, when you train a trafficCamnet model by setting below in the training spec,

output_image_width: 960
output_image_height: 544
output_image_channel: 3

then please set -d 3,544,960 -i nchw in the command line of tlt-converter.