Simply attempting to open a playlist item crashes Shotcut

TRA · May 16, 2021, 10:08pm

Opening a playlist item by double-clicking or choosing Open from the context menu makes the play button in the player unresponsive. Another attempt to open that playlist again leaves Shotcut in the state of freeze.

Steps to reproduce:

Launch Shotcut.
Open a video file.
Trim the In and Out points of the video.
I have tested without trimming the In and Out points, and it appears the same bug still happens.
Add it to the playlist by clicking the + button in the playlist or drag and dropping it to the playlist.
Attempt to open by double clicking the playlist item or choosing Open from the context menu.
Only the play button in the player becomes unresponsive.
Another attempt to open it causes Shotcut to freeze.

For some reason, if I click the forward button in the player twice, the playlist item starts to play at the forward speed, and Shotcut doesn’t crash.

This only happens with v21.05.01. I tested with v21.03.21 and am assuming that any previous versions don’t have this bug.

Additional notes:
A. Tested on Windows 10
B. Tested on two of my PCs that have different CPUs.
C. This bug doesn’t happen with image files, but it does with Color from Open Other.

shotcut · May 17, 2021, 7:53pm

Unable to reproduce here. This is a pretty basic feature that no one else has reported.

TRA · May 17, 2021, 10:36pm

I turned off Realtime (frame dropping) from the Settings menu, this bug is no longer happening.

Can you reproduce it with Realtime turned on? If not, maybe some other bug fixes will fix this.

shotcut · May 17, 2021, 10:57pm

I did all my testing with Realtime enabled as that is the default and generally recommended setting. Also, I tested on macOS and Linux as well. Do you have proxy turned on?

Hudson555x · May 17, 2021, 11:00pm

Can’t reproduce the issue, and Realtime is on.
Windows 10 Home

TRA · May 17, 2021, 11:02pm

No, proxy is turned off.

TRA · June 25, 2021, 8:11pm

This bug that I thought is happening only to me has been fixed in 21.06 Release Candidate even when I turn on Realtime. Thanks!
I’m suspecting that 1) in this post is the same problem I was having.

github.com/mltframework/shotcut

Video playback broken in versions 21.05.01 and 21.05.18 when playlist is "large"

opened 07:33AM - 31 May 21 UTC

closed 06:35PM - 13 Jun 21 UTC

Gizemquea

reproduced by dev resolved

I'm using shotcut on Windows 10 64bit, machine is a Ryzen 7 3700X, NVIDIA 1030GT… with 32 GB RAM - everything works fine in 21.03.21 (on identical machine, even if installing versions back and forth) but breaks beyond that particular version. The clips I use are nothing special in any way (GoPro Hero 7 or DJI Osmo Action footage) and playback is just fine in any application I ever tried - including shotcut up to 21.03.21. The following happens regardless of whether I am "upgrading" an existing project or starting a new project from scratch in that particular version of shotcut. I ALWAYS have at least more than hundred (sometimes even more than thousand) clips in my playlist - the problem doesn't seem to EVER occur if there are just a few clips in the playlist! Starting from 21.05.01: 1. Double click in playlist does not start playback anymore (gets me the first frame of that clip instead (REALLY annoying! )- this happens regardless of playlist size) 2. If the playlist is "large" then hitting play will start playback SOMETIMES 3. IF it starts it is extremely sluggish and stutters massively for seconds until eventually recovering - SOMETIMES it will work to pause playback and hit play once again 4. If it doesn't start (or recover), playback remains unresponsive. It will NEVER again work for this (or any other) clip. 5. Once it is in the above state: you can still successfully save your project, but trying to play another clip or getting any other form of video preview (e.g. by setting a new playhead position in the timeline) makes shotcut "not responding" 6. It is NOT a resource problem, the machine is neither under load nor even above 50% on any limiting resources (RAM, disk space etc) 7. The problem occurs so frequently that I never got past playing 3 clips in a row with large playlists and shocut versions 21.05.01 and above ... I tried every setting I could think of, including all display methods, external vs. internal monitors, display of audio waveforms etc. - no luck. It really just seems to depend on playlist size. The above has NEVER happened to me with 21.03.21 (same machine, regardless of any setting I tried) and I am in fact using 21.03.21 now to continue work on the very same projects that I can't complete with 21.05.18.