I was not able to reproduce the crashing behavior. If this is still a problem, could you give some more details about how you set this up?
While info.interlace_type is available as an H.264 parameter, it looks like coding_type determines whether the video will be encoded as progressive or interlaced for this codec. The info.interlace_type parameter is used for mpeg2.
Ive reported this to the development team so we can continue to investigate how to make this better.