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Video Editing: Strip Offset Start/End not consistent with adjusting the strip handles
Confirmed, NormalPublicKNOWN ISSUE

Description

System Information
Operating system: Win 10, 64bit
Graphics card: no (CPU)

Blender Version
Broken: (v 2.82a) and also (v 2.83 Alpha, Date 2020-03-18 17:16, Hash c9c08dc7c873)

Short description of error
From the Manual:
https://docs.blender.org/manual/en/latest/video_editing/sequencer/properties/strip.html
Strip Offset Start/End [...] This is the same as adjusting the strip handles.

However currently it is NOT really the same, which adds a lot of confusion to the already complicated concept that includes several offsets:

Detailed description of error

  • Good: Extend the Strip using Handles: The Strip gets a helpful color code. The "animated" part is colored. The extended "NOT animated / last frame repeated" part is transparent.
  • Bug: Extend the Strip using Strip Offset: "Animated" and extended parts of the Strip get the same color.
  • Good: Shorten the Strip using Handles: Strip Offset is correctly calculated.
  • Bug: Extend the Strip using the Handles (or Extend Keyboard E or Slide Keyboard S): Strip Offset is incorrectly reset to 0.
  • Good: Handles: The Strip can not be shortened past the last "animated" frame.
  • Bug: Strip Offset: The Strip can be shortened, until no "animated" frame is left, and even further until the Duration becomes negative.
  • Bug: Using Slide Keyboard S, the "animated" frames can be moved completely outside the Strip. At least one "animated" frame should remain inside the Strip.

To further improve clarity, I would

  • rename Hold Offset Start/End to Trim Source Start/End
  • change Hold Offset Start/End tooltip to "Shortens the Strip by skipping frames at the start/end of the source"
  • add Strip Offset Start/End tooltip to "Extends the trimmed strip by repeating it's first/last frame or shortens it further"
  • make End editable (it should do the same, as moving the right strip handle)
  • add End tooltip "X position where the strip ends"
  • change Duration tooltip "The length of this strip after applying Trim and Strip Offset"

If you feel very courageous

  • change Start so that it points to the start of the Strip (currently it points to the first "animated" frame)

I think, Blender heavily depends on Start, while it happily ignores Strip Offset Start and Strip Offset End. So, changing the internal meaning of Start likely makes a huge mess. However, maybe you can introduce and display a new variable "display start" or "strip start" instead, that does the trick, without messing too much with the internals.

Happy Coding!

Event Timeline

Gabriel (gabi2002) updated the task description. (Show Details)
Eitan (EitanSomething) removed Eitan (EitanSomething) as the assignee of this task.
Eitan (EitanSomething) changed the edit policy from "Custom Policy" to "All Users".
Eitan (EitanSomething) edited projects, added Video Sequencer; removed BF Blender.
Richard Antalik (ISS) changed the task status from Needs Triage to Confirmed.Thu, Mar 19, 2:28 PM

This definitely deserves some cleanup. Some issues are already reported, so I won't be adressing everything here.

I will update description before I will work on this.

Richard Antalik (ISS) changed the subtype of this task from "Report" to "Known Issue".Tue, Mar 31, 1:11 PM