run "power on self test" on startup

src/App.jsx

@@ -49,7 +49,7 @@ import { captureFrameFromTag, captureFrameFfmpeg } from './capture-frame';
 import {
   defaultProcessedCodecTypes, getStreamFps, isCuttingStart, isCuttingEnd,
   readFileMeta, getFormatData, renderThumbnails as ffmpegRenderThumbnails,
-  extractStreams, getAllStreams,
+  extractStreams, getAllStreams, runStartupCheck,
   isStreamThumbnail, isAudioDefinitelyNotSupported, isIphoneHevc, tryReadChaptersToEdl,
   getDuration, getTimecodeFromStreams, createChaptersFromSegments, extractSubtitleTrack,
 } from './ffmpeg';
@@ -2096,6 +2096,10 @@ const App = memo(() => {
     if (!isStoreBuild) loadMifiLink().then(setMifiLink);
   }, []);
 
+  useEffect(() => {
+    runStartupCheck().catch((err) => handleError('LosslessCut is installation is broken', err));
+  }, []);
+
   useEffect(() => {
     // Testing:
     // if (isDev) loadMedia({ filePath: '/Users/mifi/Downloads/inp.MOV', customOutDir });

src/ffmpeg.js

@@ -660,3 +660,7 @@ export function getTimecodeFromStreams(streams) {
   });
   return foundTimecode;
 }
+
+export async function runStartupCheck() {
+  await runFfmpeg(['-hide_banner', '-f', 'lavfi', '-i', 'nullsrc=s=256x256:d=1', '-f', 'null', '-']);
+}