I have had the same issue. I am trying to use the h.264 video codex in a flash player, which uses iframes to seek in video. When I set my keyframe interval to be quite often (keyframe every 8 frames), my seeks are accurate, but at the expense of file size.
the more key frames i generate, the bigger my file.
In an flv video workflow, you can create “cue points”, which generate iframes. This allows for a better keyframe interval, which creates smaller file sizes.
I want to divorce myself from flv and f4v, and use only the h.264 codec. Better quality, better interactivity, all around.
In FCP, chapter markers seem to do 90% of what I need, but I would love to know if anyone has figured out how to force iframes in a FCP workflow that is intended for online viewing.
Thanks