I am trying to find how the Edit and crop works to cut adverts from recordings a present could be useful if I can work it out.
Identify the parts you want to
keep by positioning bookmarks at the start and finish of each section (which can be a pain because the Humax bookmark function only works while the file is actually playing - not paused or slo-mo), then the WebIF OPT+ Crop function will create a copy with only the parts you want in the file (the original is retained in a sub-folder, delete at your leisure when you are sure the cropped version is OK).
Alternatively, if you have bracketed the parts you want to
remove, use the invert selection option in the Crop dialogue box (the graphics make it clear what will stay and what will go, one way or the other). The logic is simple: without inversion the crop removes everything before the first bookmark (ie the trailer), then everything between the second and third bookmarks (first advert break), etc. If there is no trailer (and therefore, in effect, no first bookmark), the crop selection needs to be inverted.
If you position your bookmarks roughly, you can then adjust them using the WebIF OPT+ Bookmarks function. I find the quickest workflow is to make sure the bookmarks are a little before the optimum point, then note how many seconds each one needs to be moved to the right and adjust them as a batch in the editor. The aforementioned "auto-detect ad breaks" function (in development)
could provide a way to automatically position the bookmarks by detecting adverts - which it will then be advisable to review before committing to a crop!
Be aware that the bookmark itself can only be positioned at integer seconds points, and the cut point is at the next i-frame in the video stream (where a complete image is supplied in the data stream instead of differences accumulated since the last i-frame, for obvious reasons), so the edit cannot be very precise. If you want it seamless you will have to export the recording to a proper video editor (which converts the compressed video data into uncompressed video - ie every frame is an i-frame - and then re-compresses the edited video for saving).