Player hangs after inserting clip

shotcut · June 25, 2021, 6:59pm

I am fairly sure this is the same bug as below that was already fixed for the next version 12.06 due in a couple of days:

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.

If you are eager to verify this you can try the release candidate below