[Bug]: Timeline in editor video preview stuck or laggy #1475

Activity

1. anggana-putra

   added

   bugSomething isn't workingSomething isn't working

   on Nov 3, 2026
2. EtienneLescot commented on Nov 3, 2026

   

   EtienneLescot

   on Nov 3, 2026

   Last edited by EtienneLescot

   Member

   More actions

   Thanks for the detailed report and for everything you already tried.

   To narrow this down, could you share:

   1. The recording's resolution, frame rate and length (and whether a webcam track was recorded too).
   2. Whether Export of the same project works, and roughly how long it takes.
   3. Whether a very short new recording (5–10 s) shows the same freeze.
   4. The console output around the freeze: launch Openscreen.exe from a terminal (PowerShell), reproduce, and paste what it prints.

   That will tell us whether the preview's decoder or the compositor is the one stalling.
3. anggana-putra commented on Nov 3, 2026

   

   anggana-putra

   on Nov 3, 2026

   Author

   More actions

   1. Recording Details:

   • Screen Resolution: 1080p (Full HD)
   • Frame Rate: 60 fps (59.92 fps)
   • length: 10:58 min
   • Webcam Track: with webcam, webcam track recorded : yes

   2. Export Behavior:

   • Does Export work?: Yes, the export process works fine.
   • Export Duration: It takes around around15 minutes to export.

   3. Short Project (5-10s) Behavior (with webcam and many movement):

   • Does it freeze?: No, short videos work smoothly. The freeze only happens on long videos (~10 minutes).

   4. The console:
      The console output remains completely blank even after the preview freezes. Here is the exact printout from PowerShell after reproducing the issue and toggling play/pause:

   RECORDINGS_DIR: C:\Users\Anggana\AppData\Roaming\openscreen\recordings
   User Data Path: C:\Users\Anggana\AppData\Roaming\openscreen
   Global shortcut registered: CommandOrControl+Shift+0

   however there is 2 warning while rendering :

   [D3D11VA @ 00000231ff2d9140] AMF failed to initialise on the given D3D11 device: 4.
   [h264_amf @ 00000231edda8fc0] Failed to create derived AMF device context: No such device

   ..
   log while capturing :

   source: { type: 'display', sourceId: 'screen:1:0', displayId: 0 },
   audio: {
   system: { enabled: false },
   microphone: {
   enabled: true,
   deviceId: 'communications',
   deviceName: 'Communications - Microphone Array (Realtek(R) Audio)',
   gain: 1
   }
   },
   webcam: {
   enabled: true,
   deviceId: '---',
   deviceName: 'ASUS FHD webcam (13d3:52ba)',
   width: 3840,
   height: 2160,
   fps: 30
   },
   encoder: { preferSoftwareEncoder: false },
   cursor: { mode: 'editable-overlay' },
   bounds: {
   dip: { x: 0, y: 0, width: 1920, height: 1080 },
   helper: { x: 0, y: 0, width: 1920, height: 1080 }
   },
   sourceId: 'screen:1:0',
   usedDisplayMatch: false,
4. anggana-putra commented on Nov 3, 2026

   

   anggana-putra

   on Nov 3, 2026

   Author

   More actions

   Here is screenshoot of task manager that maybe could help you

   

   Additional performance observation:
   During the preview freeze, the OpenScreen app only utilizes around 1% of the CPU, occasionally peaking at just 8% before immediately dropping back down to 1%. Even during that brief 8% CPU peak, the video timeline remains completely frozen and refuses to play, while the audio continues to stream normally. still need to waiting around 5 minutes to make the video preview in timeline played

   This extremely low hardware utilization suggests that the app is throttling itself internally or failing to distribute the frame-composing workload to the system resources, rather than the hardware being overwhelmed.

   Thank you
5. EtienneLescot commented on Nov 4, 2026

   

   EtienneLescot

   on Nov 4, 2026

   Member

   More actions

   Thanks, that narrows it down a lot: long take, 4K webcam, and the freeze hits exactly at cuts and on pause.

   One question to tell a 2.2 regression from an older limit: does the same 11-minute project play smoothly in 2.1.2? You can install it from https://github.com/getopenscreen/openscreen/releases/tag/v2.1.2 (your projects stay where they are), open the project, and play across a cut and pause once.

   If 2.1.2 also freezes, a quick extra check helps too: hide the webcam layer in 2.2.1 and see whether the screen alone still freezes.
6. EtienneLescot commented on Nov 7, 2026

   

   EtienneLescot

   on Nov 7, 2026

   Member

   More actions

   Thanks again for all the details. We rebuilt your setup on a Windows AMD machine: an 11-minute 1080p60 screen take plus a 4K30 webcam track, with a cut in the middle, on 2.2.2. Seeks took about 0.1 to 0.25 s, playback ran at 59 fps, and crossing the cut paused for under a second. We could not get anywhere near the multi-minute freeze you see, and the seek path has no wait that could last that long.

   What we could not reproduce is specific to your machine: the preview running on the NVIDIA card of a dual-GPU laptop, and a real file from your "FHD" camera that reports 4K. So I'm closing this for now. Please reopen it if you can share any of these:

   • the editor's console log around a freeze (Ctrl+Shift+I, Console tab),
   • the two recording files from that project (a download link is fine),
   • whether the same project plays smoothly in 2.1.2.

   Any one of them is enough for us to pick it back up.
7. EtienneLescot

   closed this as not plannedon Nov 7, 2026
8. anggana-putra commented on Nov 8, 2026

   

   anggana-putra

   on Nov 8, 2026

   Author

   More actions

   Hello, just got back from work and finally had time to test this out. Thank you so much for your patience!

   It appears that I cannot open my previous project in the newer version (v2.2.1) due to a schema validation error. The app prints the following error log:
   "[ {"code": "invalid_value", "values": [ 8 ], "path": [ "schemaVersion" ], "message": "Invalid input"}]"

   Because of this error, I tried creating a brand new project and recording a new video to test the timeline performance. Unfortunately, the exact same freeze issue still persists in this version (2.1.2) as well.
9. anggana-putra commented on Nov 8, 2026

   

   anggana-putra

   on Nov 8, 2026

   Last edited by anggana-putra

   Author

   More actions

   

   here is the download link to the project https://drive.google.com/drive/folders/1roOmUAOQJbVtTCuICvIvrDKE1Ge4vq5F?usp=sharing (the 10 minutes video, the 5 minutes video that have same problem and recording from my webcam)

   it appear i cannot reopen issue because i don't have permission to do so @EtienneLescot
10. marcgabe15 commented on Nov 8, 2026

    

    marcgabe15

    on Nov 8, 2026

    Collaborator

    More actions

    Hi @anggana-putra can you give access to this project on google drive? Just asked for it so I can debug and re-opened the issue
11. marcgabe15

    reopened this on Nov 8, 2026