Hardware accelerated HEVC playback broken

[pricklythorn]

The fewer issues I have to read, the more new features I will have time to implement, so I ask that you please try these things first

• Try with a different kind of file to confirm that the problem is related to just this file.
• Try with the newest version from GitHub
• Read the documentation and FAQ, Known issues, Troubleshooting
• Search for your problem under Issues or Discussions

Steps to reproduce

1. Open LosslessCut.
2. Open settings.
3. Enable Show advanced settings.
4. Scroll to the bottom and turn on Enable HEVC / H265 hardware decoding.
5. Restart LosslessCut.
6. Play a HEVC file.

Expected behavior

File is played as normal.

Actual behavior

Preview pane has nothing, not even a black screen.

Provide an error report

No error occurred.

App state:
{
  "err": false,
  "state": {
    "lastAppVersion": "3.69.0",
    "captureFormat": "png",
    "recentCustomOutDirs": [],
    "enableCustomOutDir": false,
    "keyframeCut": true,
    "preserveMetadata": "default",
    "preserveMetadataOnMerge": false,
    "preserveMovData": false,
    "preserveChapters": true,
    "movFastStart": true,
    "avoidNegativeTs": "make_zero",
    "autoMerge": true,
    "timecodeFormat": "timecodeWithDecimalFraction",
    "invertCutSegments": false,
    "autoExportExtraStreams": true,
    "askBeforeClose": false,
    "enableImportChapters": "ask",
    "enableAskForFileOpenAction": true,
    "playbackVolume": 1,
    "autoSaveProjectFile": true,
    "wheelSensitivity": 0.2,
    "waveformHeight": 40,
    "language": "en",
    "ffmpegExperimental": false,
    "autoLoadTimecode": false,
    "autoDeleteMergedSegments": true,
    "exportConfirmEnabled": false,
    "segmentsToChapters": false,
    "simpleMode": true,
    "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": 1,
    "captureFrameFileNameFormat": "timestamp",
    "enableNativeHevc": true,
    "enableUpdateCheck": true,
    "cleanupChoices": {
      "trashTmpFiles": true,
      "askForCleanup": true,
      "closeFile": true,
      "cleanupAfterExport": false
    },
    "allowMultipleInstances": false,
    "darkMode": true,
    "preferStrongColors": false,
    "outputFileNameMinZeroPadding": 1,
    "cutFromAdjustmentFrames": 0,
    "cutToAdjustmentFrames": 0,
    "storeWindowBounds": true,
    "thumbnailsEnabled": false,
    "keyframesEnabled": true,
    "reducedMotion": "user",
    "ffmpegHwaccel": "auto",
    "ffmpegVersion": "n8.0-23-gd1f31a829d-20251022",
    "filePath": "/home/*/Downloads/Cool Avatar 1.mkv",
    "fileFormat": "matroska",
    "externalFilesMeta": {},
    "mainStreams": [
      {
        "index": 0,
        "codec_name": "hevc",
        "codec_long_name": "H.265 / HEVC (High Efficiency Video Coding)",
        "profile": "Rext",
        "codec_type": "video",
        "codec_tag_string": "[0][0][0][0]",
        "codec_tag": "0x0000",
        "width": 1920,
        "height": 1080,
        "coded_width": 1920,
        "coded_height": 1088,
        "has_b_frames": 2,
        "sample_aspect_ratio": "1:1",
        "display_aspect_ratio": "16:9",
        "pix_fmt": "yuv444p",
        "level": 150,
        "color_range": "pc",
        "color_space": "bt709",
        "color_transfer": "bt709",
        "color_primaries": "bt709",
        "refs": 1,
        "view_ids_available": "",
        "view_pos_available": "",
        "r_frame_rate": "120/1",
        "avg_frame_rate": "120/1",
        "time_base": "1/1000",
        "start_pts": 17,
        "start_time": "0.017000",
        "extradata_size": 131,
        "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": {
          "DURATION": "00:00:11.817000000"
        }
      },
      {
        "index": 1,
        "codec_name": "pcm_f32le",
        "codec_long_name": "PCM 32-bit floating point little-endian",
        "codec_type": "audio",
        "codec_tag_string": "[0][0][0][0]",
        "codec_tag": "0x0000",
        "sample_fmt": "flt",
        "sample_rate": "48000",
        "channels": 2,
        "bits_per_sample": 32,
        "initial_padding": 0,
        "r_frame_rate": "0/0",
        "avg_frame_rate": "0/0",
        "time_base": "1/1000",
        "start_pts": 1,
        "start_time": "0.001000",
        "bit_rate": "3072000",
        "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": {
          "title": "Desktop Audio (Without Calls)",
          "DURATION": "00:00:11.798000000"
        }
      },
      {
        "index": 2,
        "codec_name": "pcm_f32le",
        "codec_long_name": "PCM 32-bit floating point little-endian",
        "codec_type": "audio",
        "codec_tag_string": "[0][0][0][0]",
        "codec_tag": "0x0000",
        "sample_fmt": "flt",
        "sample_rate": "48000",
        "channels": 2,
        "bits_per_sample": 32,
        "initial_padding": 0,
        "r_frame_rate": "0/0",
        "avg_frame_rate": "0/0",
        "time_base": "1/1000",
        "start_pts": 1,
        "start_time": "0.001000",
        "bit_rate": "3072000",
        "disposition": {
          "default": 0,
          "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": {
          "title": "Desktop Audio",
          "DURATION": "00:00:11.798000000"
        }
      },
      {
        "index": 3,
        "codec_name": "pcm_f32le",
        "codec_long_name": "PCM 32-bit floating point little-endian",
        "codec_type": "audio",
        "codec_tag_string": "[0][0][0][0]",
        "codec_tag": "0x0000",
        "sample_fmt": "flt",
        "sample_rate": "48000",
        "channels": 2,
        "bits_per_sample": 32,
        "initial_padding": 0,
        "r_frame_rate": "0/0",
        "avg_frame_rate": "0/0",
        "time_base": "1/1000",
        "start_pts": 1,
        "start_time": "0.001000",
        "bit_rate": "3072000",
        "disposition": {
          "default": 0,
          "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": {
          "title": "Microphone",
          "DURATION": "00:00:11.798000000"
        }
      }
    ],
    "copyStreamIdsByFile": {
      "/home/*/Downloads/Cool Avatar 1.mkv": {
        "0": true,
        "1": true,
        "2": true,
        "3": true
      }
    },
    "cutSegments": [
      {
        "start": 0,
        "end": 11.817
      }
    ],
    "mainFileFormat": {
      "filename": "/home/*/Downloads/Cool Avatar 1.mkv",
      "nb_streams": 4,
      "nb_programs": 0,
      "nb_stream_groups": 0,
      "format_name": "matroska,webm",
      "format_long_name": "Matroska / WebM",
      "start_time": "0.001000",
      "duration": "11.817000",
      "size": "22380287",
      "bit_rate": "15151247",
      "probe_score": 100,
      "tags": {
        "ENCODER": "Lavf62.3.100"
      }
    },
    "rotation": 360,
    "shortestFlag": false,
    "effectiveExportMode": "merge"
  },
  "appPath": "/usr/share/losslesscut/resources/app.asar",
  "platform": "linux",
  "arch": "x64",
  "version": "3.69.0"
}

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Share log from developer tools

App.tsx:1815 userOpenFiles
App.tsx:1816 /home/*/Downloads/Cool Avatar 1.mkv
ffmpeg.ts:256 FFprobe detected format(s) matroska,webm
ffmpeg.ts:317 file-type returned unknown format Array(2) video/matroska
determineSourceFileFormat @ ffmpeg.ts:317
App.tsx:1476 loadMedia Object
App.tsx:641 State reset
App.tsx:365 onDurationChange 11.817
useSegments.tsx:900 Creating initial segment Object

[pricklythorn]

I have looked at this discussion about HEVC playback on Linux, adding --enable-features=AcceleratedVideoDecodeLinuxGL does not fix the issue.
I'm on CachyOS 7.0.12-1, Plasma (Wayland) 6.7.0-1.1, NVIDIA 610.43.02, Electron 38 as bundled with the LosslessCut AppImage.