Seeking causes frame flickering

[kamild1996]

Whenever I seek through the video open within LosslessCut, there's a visual glitch that looks like two frames being rapidly switched.
Video capture below, although because the flicker is so quick, it's only visible briefly on the recording, while on my screen the flickering was constant every time I seeked through the video. Normal video playback is fine.
Screencast_20261017_140943.webm

---

OS: CachyOS, Linux 7.2.10, KDE Plasma 6.8
GPU: Nvidia GeForce RTX 4080 SUPER
Bug report log from the OS for more OS info: https://paste.cachyos.org/p/b61793f.log
Support text from LosslessCut:

No error occurred.

App state:
{
  "err": false,
  "state": {
    "lastAppVersion": "3.69.0",
    "captureFormat": "jpeg",
    "recentCustomOutDirs": [
      "/mnt/hdd/Moje wideo/Upload queue",
      "/mnt/hdd/Moje wideo/VidJoin/Upload queue"
    ],
    "enableCustomOutDir": true,
    "keyframeCut": true,
    "preserveMetadata": "none",
    "preserveMetadataOnMerge": false,
    "preserveMovData": false,
    "preserveChapters": false,
    "movFastStart": true,
    "avoidNegativeTs": "make_zero",
    "autoMerge": false,
    "timecodeFormat": "timecodeWithDecimalFraction",
    "invertCutSegments": false,
    "autoExportExtraStreams": true,
    "askBeforeClose": false,
    "enableImportChapters": "ask",
    "enableAskForFileOpenAction": true,
    "playbackVolume": 0.3,
    "autoSaveProjectFile": false,
    "wheelSensitivity": 0.2,
    "waveformHeight": 40,
    "language": "en",
    "ffmpegExperimental": false,
    "autoLoadTimecode": false,
    "autoDeleteMergedSegments": true,
    "exportConfirmEnabled": true,
    "segmentsToChapters": false,
    "simpleMode": false,
    "cutFileTemplate": "${FILENAME}-${CUT_FROM}-${CUT_TO}${SEG_SUFFIX}${EXT}",
    "keyboardSeekAccFactor": 1.03,
    "keyboardNormalSeekSpeed": 1,
    "keyboardSeekSpeed2": 10,
    "keyboardSeekSpeed3": 60,
    "treatInputFileModifiedTimeAsStart": true,
    "treatOutputFileModifiedTimeAsStart": true,
    "safeOutputFileName": true,
    "enableAutoHtml5ify": true,
    "segmentsToChaptersOnly": false,
    "enableSmartCut": false,
    "storeProjectInWorkingDir": true,
    "enableOverwriteOutput": true,
    "mouseWheelZoomModifierKey": "ctrl",
    "mouseWheelFrameSeekModifierKey": "alt",
    "mouseWheelKeyframeSeekModifierKey": "shift",
    "segmentMouseModifierKey": "shift",
    "captureFrameMethod": "videotag",
    "captureFrameQuality": 0.95,
    "captureFrameFileNameFormat": "timestamp",
    "enableNativeHevc": false,
    "enableUpdateCheck": true,
    "cleanupChoices": {
      "trashTmpFiles": true,
      "askForCleanup": true,
      "closeFile": true,
      "cleanupAfterExport": false,
      "trashProjectFile": true
    },
    "allowMultipleInstances": false,
    "darkMode": true,
    "preferStrongColors": false,
    "outputFileNameMinZeroPadding": 1,
    "cutFromAdjustmentFrames": 0,
    "cutToAdjustmentFrames": 0,
    "storeWindowBounds": true,
    "thumbnailsEnabled": false,
    "keyframesEnabled": true,
    "reducedMotion": "user",
    "ffmpegHwaccel": "none",
    "ffmpegVersion": "8.1.2",
    "filePath": "/mnt/hdd/Moje wideo/gpu-screen-recorder/Replay_2026-10-17_14-05-45.mp4",
    "fileFormat": "mp4",
    "externalFilesMeta": {},
    "mainStreams": [
      {
        "index": 0,
        "codec_name": "av1",
        "codec_long_name": "Alliance for Open Media AV1",
        "profile": "Main",
        "codec_type": "video",
        "codec_tag_string": "av01",
        "codec_tag": "0x31307661",
        "mime_codec_string": "av01.0.09M.08.0.110.01.01.01.1",
        "width": 1920,
        "height": 1080,
        "coded_width": 1920,
        "coded_height": 1080,
        "has_b_frames": 0,
        "sample_aspect_ratio": "1:1",
        "display_aspect_ratio": "16:9",
        "pix_fmt": "yuv420p",
        "level": 9,
        "color_range": "pc",
        "color_space": "bt709",
        "color_transfer": "bt709",
        "color_primaries": "bt709",
        "id": "0x1",
        "r_frame_rate": "60/1",
        "avg_frame_rate": "60/1",
        "time_base": "1/1000000",
        "start_pts": 0,
        "start_time": "0.000000",
        "duration_ts": 60450000,
        "duration": "60.450000",
        "bit_rate": "3790771",
        "nb_frames": "3627",
        "extradata_size": 20,
        "disposition": {
          "default": 1,
          "dub": 0,
          "original": 0,
          "comment": 0,
          "lyrics": 0,
          "karaoke": 0,
          "forced": 0,
          "hearing_impaired": 0,
          "visual_impaired": 0,
          "clean_effects": 0,
          "attached_pic": 0,
          "timed_thumbnails": 0,
          "non_diegetic": 0,
          "captions": 0,
          "descriptions": 0,
          "metadata": 0,
          "dependent": 0,
          "still_image": 0,
          "multilayer": 0
        },
        "tags": {
          "language": "und",
          "handler_name": "VideoHandler"
        }
      },
      {
        "index": 1,
        "codec_name": "opus",
        "codec_long_name": "Opus (Opus Interactive Audio Codec)",
        "codec_type": "audio",
        "codec_tag_string": "Opus",
        "codec_tag": "0x7375704f",
        "mime_codec_string": "opus",
        "sample_fmt": "fltp",
        "sample_rate": "48000",
        "channels": 2,
        "channel_layout": "stereo",
        "bits_per_sample": 0,
        "initial_padding": 312,
        "id": "0x2",
        "r_frame_rate": "0/0",
        "avg_frame_rate": "0/0",
        "time_base": "1/48000",
        "start_pts": 0,
        "start_time": "0.000000",
        "duration_ts": 2901120,
        "duration": "60.440000",
        "bit_rate": "122183",
        "nb_frames": "3022",
        "extradata_size": 19,
        "disposition": {
          "default": 1,
          "dub": 0,
          "original": 0,
          "comment": 0,
          "lyrics": 0,
          "karaoke": 0,
          "forced": 0,
          "hearing_impaired": 0,
          "visual_impaired": 0,
          "clean_effects": 0,
          "attached_pic": 0,
          "timed_thumbnails": 0,
          "non_diegetic": 0,
          "captions": 0,
          "descriptions": 0,
          "metadata": 0,
          "dependent": 0,
          "still_image": 0,
          "multilayer": 0
        },
        "tags": {
          "language": "und",
          "handler_name": "SoundHandler",
          "name": "All applications except: electron, vivaldi-bin, Discord"
        }
      }
    ],
    "copyStreamIdsByFile": {
      "/mnt/hdd/Moje wideo/gpu-screen-recorder/Replay_2026-10-17_14-05-45.mp4": {
        "0": true,
        "1": true
      }
    },
    "cutSegments": [
      {
        "start": 0,
        "end": 60.45
      }
    ],
    "mainFileFormat": {
      "filename": "/mnt/hdd/Moje wideo/gpu-screen-recorder/Replay_2026-10-17_14-05-45.mp4",
      "nb_streams": 2,
      "nb_programs": 0,
      "nb_stream_groups": 0,
      "format_name": "mov,mp4,m4a,3gp,3g2,mj2",
      "format_long_name": "QuickTime / MOV",
      "start_time": "0.000000",
      "duration": "60.450000",
      "size": "29672200",
      "bit_rate": "3926842",
      "probe_score": 100,
      "tags": {
        "major_brand": "isom",
        "minor_version": "512",
        "compatible_brands": "isomiso6av01iso2mp41",
        "encoder": "Lavf63.1.102"
      }
    },
    "rotation": 360,
    "shortestFlag": false,
    "effectiveExportMode": "separate"
  },
  "appPath": "/app/lossless-cut/resources/app",
  "platform": "linux",
  "arch": "x64",
  "version": "3.69.0"
}