Of course this can only be done if the content being trimmed makes up the whole reel. And it breaks a quite deeply-held assumption that you can work out which reel something belongs in by its timecode. And fundamentally the content decoders have no idea about reels, so we can't even get the decoder to tell the Writer which reel something belongs in.

I guess we could have the option but only enable it if the content in question is the only picture/sound in its reel.

Or have an option to add our own pops.

Or have some kind of reel editing UI. This is perhaps more appealing, as the player could remain the same and we could just edit the reel start/ends "afterwards". Though you'd have to preview the DCP with all the extra crap in and then believe/hope that it would be taken out at some later stage.

The logical extension of this might be some "edit" tool that can re-write XML, verify, change entry points on reels, annotation texts etc.

dcp-editor branch for the editor

The editor is in 2.16.10 - I'll leave this open to for the other (nicer) idea of having a button in DoM along the lines of "trim this content only in the CPL".