MIDI Item split bug (FIXED)

[Fabian]

I have a MIDI item set to play at half speed. When I split it in half, something very strange happens. See here:



I expected to get two MIDI items, with with play rate 0.5, one containing the left part and the other containing the right part of the original item.

Instead the left part becomes a one-bar item looped over the two bars, while the right part becomes a quarter-bar item looped over the two bars.

[Fabian]

Some more info... This happens when I have a longer MIDI item at 0.5 play rate that I split in two places. Then the middle part between the splits somehow gets mucked up. Splitting this middle part then creates the disaster described in my post above.

Can someone please confirm?

[DarkStar]

Seems OK here -v 4.54.

Can you attach a small problem project (before the split)?

[FnA]

Will try this evening (USA).

Have some other weird things with splitting MIDI. Not trying to hijack, just mentioning...

1. Split some items, Extended them all (blank space) with trim edge to cursor. Attempted to duplicate with All Track Ripple on. Project markers were rippled, but not items. Duplicates landed on top of other items. Undid that, glued the items, and it worked as expected. Think this was on 4.54. Could not reproduce similar situation later.

2. Split item at time selection. Ran SWS transpose down a semitone on the item created by the split. Notes at start of item were erased. Undid it, tried again, same thing. Glued item, worked as expected. This was on 4.55.

[xpander]

Originally Posted by Fabian

Can someone please confirm?

Trying many different ways, I managed to get the same thing happening twice last night, but failed to reproduce intentionally. Might try more tonight.

[FnA]

Was able to reproduce something similar immediately. You can see the loop notch at the point where the split will occur in the original item, and the different notes on either side indicate that both edges have been trimmed. In addition to the rate change. Another thing that has an effect on the outcome is the preference setting to allow trim of MIDI items when splitting. (I think that should be an 'Options:' action that reports a toggle state.)

[xpander]

I can reproduce like this:

1. Create a MIDI item. Change the rate of the item (eg. 0.50 like OP).
2. Make sure you have Loop item source ON, then stretch the item so it loops three times.
3. Split the item from the last loop point.
4. Trim the edge back starting from this split point.
5. Go to the first loop point and split there.
6. Go towards the next loop point, but stop just short of it.
7. Split there.

Result: Left side of this last split is normal. The length of the new item on the right side will be the distance between the split point and the old loop point, rest of the new item space is filled with this piece looped over and over.



---

edit: even simpler.
1. Create a MIDI item. Change the rate of the item (eg. 0.50 like OP).
2. Make sure you have Loop item source ON, then stretch the item so it loops once.
3. Make a split anywhere on the looped part.
4. Trim the edge back starting from this split point.
5. Go back just a little over the the first loop point and split there.

[Fabian]

So I take it this is confirmed then.
So a bug ticket next, I guess...

Thanks guys.

[FnA]

Never got around to it, eh? Still present in v5 pre and official release. I'll do it tomorrow I guess...

Steps to reproduce, or cause some similar destruction-

1. Set Preferences>Media>MIDI>Allow trim of MIDI media items when splitting enabled.

2. Make MIDI item, say 4 bars. Paint a line of short notes across it.

3. Stretch the item longer, say 7 bars altogether.

4. Pull the left edge right about 2 bars

5. Split item

[Fergler]

I meant to get around to reporting this, also. I encounter it basically every project that uses MIDI, at some point.

[FnA]

Tracker Link-

http://forum.cockos.com/project.php?issueid=5575

[foxAsteria]

i can reproduce that behavior.

[Dstruct]

Confirmed (5.17).

FIXED (5.18pre1)

[ELP]

This is only happen if:
A. Trim is enable
+
B. Item Playback-rate is lower than 1
+
C. You make something of the split item only hidden from left edge before splitting

And if A+B+C is true the result would be as follow.
% size of empty area at right side of left item
= hidden area size*(1 - item playback rate)

It is one of the meanwhile, personally think, rather rare very old -
little errors, under hood bugs or whatever


Example
4 beats hidden from left edge, item play rate 0.5 = right side empty area at left item 2 beats
4 beats hidden from left edge, item play rate 0.25 = right side empty area 3 beats

This is not happen if trim is not enable
or you make something not only hidden from
left edge before splitting
or item playback rate is higher 1

-
or split the hidden area from item before split the other
or at least glue the item before splitting..

The biggest problem for getting into this behavior is hiding only an area from left edge.

Of course it is an open bug.. but with the possibility to easy avoid.

[Justin]

Fixing, thanks!

[ELP]

thank you Justin.

And now older .. gets more and more rare

[Fabian]

Wow...
Thanks all.