create segments from:

- scene changes
- keyframes

closes #1398

also limit max number of segments
and improve parameters dialog

README.md

@@ -52,7 +52,7 @@ The main feature is lossless trimming and cutting of video and audio files, whic
 - MKV/MP4 embedded chapters marks editor
 - View subtitles
 - Customizable keyboard hotkeys
-- Black scene detection and silent audio detection
+- Black scene detection, silent audio detection, and scene change detection
 - Divide timeline into segments with length L or into N segments or even randomized segments!
 - [Basic CLI support](cli.md)
 
@@ -77,6 +77,8 @@ The main feature is lossless trimming and cutting of video and audio files, whic
 - Loop a video / audio clip X times quickly without re-encoding
   - See [#284](https://github.com/mifi/lossless-cut/issues/284)
 - Convert a video or parts of it into X image files (not lossless)
+- Losslessly split a video into one file per scene (note you probably have to shift segments, see [#330](https://github.com/mifi/lossless-cut/issues/330).)
+- Cut away silent parts of an audio/video
 
 ### Export cut times as YouTube Chapters
 1. Export with Merge and "Create chapters from merged segments" enabled

public/menu.js

@@ -305,6 +305,18 @@ module.exports = (app, mainWindow, newVersion) => {
             mainWindow.webContents.send('detectSilentScenes');
           },
         },
+        {
+          label: i18n.t('Detect scene changes'),
+          click() {
+            mainWindow.webContents.send('detectSceneChanges');
+          },
+        },
+        {
+          label: i18n.t('Create segments from keyframes'),
+          click() {
+            mainWindow.webContents.send('createSegmentsFromKeyframes');
+          },
+        },
         {
           label: i18n.t('Last ffmpeg commands'),
           click() { mainWindow.webContents.send('toggleLastCommands'); },

src/App.jsx

@@ -53,9 +53,9 @@ import {
   getStreamFps, isCuttingStart, isCuttingEnd,
   readFileMeta, getSmarterOutFormat, renderThumbnails as ffmpegRenderThumbnails,
   extractStreams, runStartupCheck, setCustomFfPath as ffmpegSetCustomFfPath,
-  isIphoneHevc, tryMapChaptersToEdl, blackDetect, silenceDetect,
+  isIphoneHevc, tryMapChaptersToEdl, blackDetect, silenceDetect, detectSceneChanges as ffmpegDetectSceneChanges,
   getDuration, getTimecodeFromStreams, createChaptersFromSegments, extractSubtitleTrack,
-  getFfmpegPath, RefuseOverwriteError,
+  getFfmpegPath, RefuseOverwriteError, readFrames, mapTimesToSegments,
 } from './ffmpeg';
 import { shouldCopyStreamByDefault, getAudioStreams, getRealVideoStreams, isAudioDefinitelyNotSupported, doesPlayerSupportFile } from './util/streams';
 import { exportEdlFile, readEdlFile, saveLlcProject, loadLlcProject, askForEdlImport } from './edlStore';
@@ -74,6 +74,8 @@ import { openSendReportDialog } from './reporting';
 import { fallbackLng } from './i18n';
 import { createSegment, getCleanCutSegments, getSegApparentStart, findSegmentsAtCursor, sortSegments, invertSegments, getSegmentTags, convertSegmentsToChapters, hasAnySegmentOverlap } from './segments';
 import { getOutSegError as getOutSegErrorRaw } from './util/outputNameTemplate';
+import * as ffmpegParameters from './ffmpeg-parameters';
+import { maxSegmentsAllowed } from './util/constants';
 
 import isDev from './isDev';
 
@@ -1491,13 +1493,14 @@ const App = memo(() => {
 
     if (validEdl.length === 0) throw new Error(i18n.t('No valid segments found'));
 
-    if (!append) {
-      clearSegCounter();
-    }
+    if (!append) clearSegCounter();
+
+    if (validEdl.length > maxSegmentsAllowed) throw new Error(i18n.t('Tried to create too many segments (max {{maxSegmentsAllowed}}.)', { maxSegmentsAllowed }));
+
     setCutSegments((existingSegments) => {
       const needToAppend = append && existingSegments.length > 1;
-      const newSegments = validEdl.map((segment, i) => createIndexedSegment({ segment, incrementCount: needToAppend || i > 0 }));
-      if (needToAppend) return [...existingSegments, ...newSegments];
+      let newSegments = validEdl.map((segment, i) => createIndexedSegment({ segment, incrementCount: needToAppend || i > 0 }));
+      if (needToAppend) newSegments = [...existingSegments, ...newSegments];
       return newSegments;
     });
   }, [clearSegCounter, createIndexedSegment, setCutSegments]);
@@ -1753,7 +1756,7 @@ const App = memo(() => {
     }
   }, [customOutDir, enableOverwriteOutput, filePath, mainStreams, setWorking]);
 
-  const detectScenes = useCallback(async ({ name, workingText, errorText, fn }) => {
+  const detectSegments = useCallback(async ({ name, workingText, errorText, fn }) => {
     if (!filePath) return;
     if (workingRef.current) return;
     try {
@@ -1764,8 +1767,7 @@ const App = memo(() => {
       console.log(name, newSegments);
       loadCutSegments(newSegments, true);
     } catch (err) {
-      errorToast(errorText);
-      console.error('Failed to detect scenes', name, err);
+      handleError(errorText, err);
     } finally {
       setWorking();
       setCutProgress();
@@ -1773,40 +1775,28 @@ const App = memo(() => {
   }, [filePath, setWorking, loadCutSegments]);
 
   const detectBlackScenes = useCallback(async () => {
-    const parameters = {
-      black_min_duration: {
-        value: '2.0',
-        hint: i18n.t('Set the minimum detected black duration expressed in seconds. It must be a non-negative floating point number.'),
-      },
-      picture_black_ratio_th: {
-        value: '0.98',
-        hint: i18n.t('Set the threshold for considering a picture "black".'),
-      },
-      pixel_black_th: {
-        value: '0.10',
-        hint: i18n.t('Set the threshold for considering a pixel "black".'),
-      },
-    };
-    const filterOptions = await showParametersDialog({ title: i18n.t('Enter parameters'), parameters, docUrl: 'https://ffmpeg.org/ffmpeg-filters.html#blackdetect' });
+    const filterOptions = await showParametersDialog({ title: i18n.t('Enter parameters'), parameters: ffmpegParameters.blackdetect(), docUrl: 'https://ffmpeg.org/ffmpeg-filters.html#blackdetect' });
     if (filterOptions == null) return;
-    await detectScenes({ name: 'blackScenes', workingText: i18n.t('Detecting black scenes'), errorText: i18n.t('Failed to detect black scenes'), fn: async () => blackDetect({ filePath, duration, filterOptions, onProgress: setCutProgress, from: currentApparentCutSeg.start, to: currentApparentCutSeg.end }) });
-  }, [currentApparentCutSeg.end, currentApparentCutSeg.start, detectScenes, duration, filePath]);
+    await detectSegments({ name: 'blackScenes', workingText: i18n.t('Detecting black scenes'), errorText: i18n.t('Failed to detect black scenes'), fn: async () => blackDetect({ filePath, duration, filterOptions, onProgress: setCutProgress, from: currentApparentCutSeg.start, to: currentApparentCutSeg.end }) });
+  }, [currentApparentCutSeg.end, currentApparentCutSeg.start, detectSegments, duration, filePath]);
 
   const detectSilentScenes = useCallback(async () => {
-    const parameters = {
-      noise: {
-        value: '-60dB',
-        hint: i18n.t('Set noise tolerance. Can be specified in dB (in case "dB" is appended to the specified value) or amplitude ratio. Default is -60dB, or 0.001.'),
-      },
-      duration: {
-        value: '2.0',
-        hint: i18n.t('Set silence duration until notification (default is 2 seconds).'),
-      },
-    };
-    const filterOptions = await showParametersDialog({ title: i18n.t('Enter parameters'), parameters, docUrl: 'https://ffmpeg.org/ffmpeg-filters.html#silencedetect' });
+    const filterOptions = await showParametersDialog({ title: i18n.t('Enter parameters'), parameters: ffmpegParameters.silencedetect(), docUrl: 'https://ffmpeg.org/ffmpeg-filters.html#silencedetect' });
+    if (filterOptions == null) return;
+    await detectSegments({ name: 'silentScenes', workingText: i18n.t('Detecting silent scenes'), errorText: i18n.t('Failed to detect silent scenes'), fn: async () => silenceDetect({ filePath, duration, filterOptions, onProgress: setCutProgress, from: currentApparentCutSeg.start, to: currentApparentCutSeg.end }) });
+  }, [currentApparentCutSeg.end, currentApparentCutSeg.start, detectSegments, duration, filePath]);
+
+  const detectSceneChanges = useCallback(async () => {
+    const filterOptions = await showParametersDialog({ title: i18n.t('Enter parameters'), parameters: ffmpegParameters.sceneChange() });
     if (filterOptions == null) return;
-    await detectScenes({ name: 'silentScenes', workingText: i18n.t('Detecting silent scenes'), errorText: i18n.t('Failed to detect silent scenes'), fn: async () => silenceDetect({ filePath, duration, filterOptions, onProgress: setCutProgress, from: currentApparentCutSeg.start, to: currentApparentCutSeg.end }) });
-  }, [currentApparentCutSeg.end, currentApparentCutSeg.start, detectScenes, duration, filePath]);
+    await detectSegments({ name: 'sceneChanges', workingText: i18n.t('Detecting scene changes'), errorText: i18n.t('Failed to detect scene changes'), fn: async () => ffmpegDetectSceneChanges({ filePath, duration, minChange: filterOptions.minChange, onProgress: setCutProgress, from: currentApparentCutSeg.start, to: currentApparentCutSeg.end }) });
+  }, [currentApparentCutSeg.end, currentApparentCutSeg.start, detectSegments, duration, filePath]);
+
+  const createSegmentsFromKeyframes = useCallback(async () => {
+    const keyframes = (await readFrames({ filePath, from: currentApparentCutSeg.start, to: currentApparentCutSeg.end, streamIndex: mainVideoStream?.index })).filter((frame) => frame.keyframe);
+    const newSegments = mapTimesToSegments(keyframes.map((keyframe) => keyframe.time));
+    loadCutSegments(newSegments, true);
+  }, [currentApparentCutSeg.end, currentApparentCutSeg.start, filePath, loadCutSegments, mainVideoStream?.index]);
 
   const userHtml5ifyCurrentFile = useCallback(async () => {
     if (!filePath) return;
@@ -2276,7 +2266,7 @@ const App = memo(() => {
       }
     }
 
-    const action = {
+    const actions = {
       openFiles: (event, filePaths) => { userOpenFiles(filePaths.map(resolvePathIfNeeded)); },
       openFilesDialog,
       closeCurrentFile: () => { closeFileWithConfirm(); },
@@ -2305,13 +2295,25 @@ const App = memo(() => {
       concatCurrentBatch,
       detectBlackScenes,
       detectSilentScenes,
+      detectSceneChanges,
+      createSegmentsFromKeyframes,
       shiftAllSegmentTimes,
     };
 
-    const entries = Object.entries(action);
-    entries.forEach(([key, value]) => electron.ipcRenderer.on(key, value));
-    return () => entries.forEach(([key, value]) => electron.ipcRenderer.removeListener(key, value));
-  }, [apparentCutSegments, askSetStartTimeOffset, checkFileOpened, clearSegments, closeBatch, closeFileWithConfirm, concatCurrentBatch, createFixedDurationSegments, createNumSegments, createRandomSegments, customOutDir, cutSegments, detectBlackScenes, detectSilentScenes, detectedFps, extractAllStreams, fileFormat, filePath, fillSegmentsGaps, getFrameCount, invertAllSegments, loadCutSegments, loadMedia, openFilesDialog, openSendReportDialogWithState, reorderSegsByStartTime, setWorking, shiftAllSegmentTimes, shuffleSegments, toggleKeyboardShortcuts, toggleLastCommands, toggleSettings, tryFixInvalidDuration, userHtml5ifyCurrentFile, userOpenFiles]);
+    const actionsWithCatch = Object.entries(actions).map(([key, action]) => [
+      key,
+      async () => {
+        try {
+          await action();
+        } catch (err) {
+          handleError(err);
+        }
+      },
+    ]);
+
+    actionsWithCatch.forEach(([key, action]) => electron.ipcRenderer.on(key, action));
+    return () => actionsWithCatch.forEach(([key, action]) => electron.ipcRenderer.removeListener(key, action));
+  }, [apparentCutSegments, askSetStartTimeOffset, checkFileOpened, clearSegments, closeBatch, closeFileWithConfirm, concatCurrentBatch, createFixedDurationSegments, createNumSegments, createRandomSegments, createSegmentsFromKeyframes, customOutDir, cutSegments, detectBlackScenes, detectSceneChanges, detectSilentScenes, detectedFps, extractAllStreams, fileFormat, filePath, fillSegmentsGaps, getFrameCount, invertAllSegments, loadCutSegments, loadMedia, openFilesDialog, openSendReportDialogWithState, reorderSegsByStartTime, setWorking, shiftAllSegmentTimes, shuffleSegments, toggleKeyboardShortcuts, toggleLastCommands, toggleSettings, tryFixInvalidDuration, userHtml5ifyCurrentFile, userOpenFiles]);
 
   const showAddStreamSourceDialog = useCallback(async () => {
     try {

src/dialogs.jsx

@@ -1,4 +1,4 @@
-import React, { useState, useCallback } from 'react';
+import React, { useState, useCallback, useRef, useEffect } from 'react';
 import { Button, TextInputField, Checkbox, RadioGroup, Paragraph, LinkIcon } from 'evergreen-ui';
 import Swal from 'sweetalert2';
 import i18n from 'i18next';
@@ -404,42 +404,71 @@ export async function showCleanupFilesDialog(cleanupChoicesIn = {}) {
   return undefined;
 }
 
-const ParametersInput = ({ description, parameters: parametersIn, onChange: onChangeProp, docUrl }) => {
+const ParametersInput = ({ description, parameters: parametersIn, onChange, onSubmit, docUrl }) => {
+  const firstInputRef = useRef();
   const [parameters, setParameters] = useState(parametersIn);
 
   const getParameter = (key) => parameters[key]?.value;
-  const onChange = (key, value) => setParameters((existing) => {
+
+  const handleChange = (key, value) => setParameters((existing) => {
     const newParameters = { ...existing, [key]: { ...existing[key], value } };
-    onChangeProp(newParameters);
+    onChange(newParameters);
     return newParameters;
   });
 
+  const handleSubmit = useCallback((e) => {
+    e.preventDefault();
+    onSubmit();
+  }, [onSubmit]);
+
+  useEffect(() => {
+    firstInputRef.current?.focus?.();
+  }, []);
+
   return (
     <div style={{ textAlign: 'left' }}>
       {description && <p>{description}</p>}
 
       {docUrl && <p><Button iconBefore={LinkIcon} onClick={() => electron.shell.openExternal(docUrl)}>Read more</Button></p>}
 
-      {Object.entries(parametersIn).map(([key, parameter]) => (
-        <TextInputField key={key} label={parameter.label || key} value={getParameter(key)} onChange={(e) => onChange(key, e.target.value)} hint={parameter.hint} />
-      ))}
+      <form onSubmit={handleSubmit}>
+        {Object.entries(parametersIn).map(([key, parameter], i) => (
+          <TextInputField ref={i === 0 ? firstInputRef : undefined} key={key} label={parameter.label || key} value={getParameter(key)} onChange={(e) => handleChange(key, e.target.value)} hint={parameter.hint} />
+        ))}
+
+        <input type="submit" value="submit" style={{ display: 'none' }} />
+      </form>
     </div>
   );
 };
 
 export async function showParametersDialog({ title, description, parameters: parametersIn, docUrl }) {
   let parameters = parametersIn;
+  let resolve1;
 
-  const { value } = await ReactSwal.fire({
-    title,
-    html: <ParametersInput description={description} parameters={parameters} onChange={(newParameters) => { parameters = newParameters; }} docUrl={docUrl} />,
-    confirmButtonText: i18n.t('Confirm'),
-    showCancelButton: true,
-    cancelButtonText: i18n.t('Cancel'),
+  const promise1 = new Promise((resolve) => {
+    resolve1 = resolve;
   });
+  const handleSubmit = () => {
+    Swal.close();
+    resolve1(true);
+  };
 
-  if (value) return Object.fromEntries(Object.entries(parameters).map(([key, parameter]) => [key, parameter.value]));
-  return undefined;
+  const promise2 = (async () => {
+    const { isConfirmed } = await ReactSwal.fire({
+      title,
+      html: <ParametersInput description={description} parameters={parameters} onChange={(newParameters) => { parameters = newParameters; }} onSubmit={handleSubmit} docUrl={docUrl} />,
+      confirmButtonText: i18n.t('Confirm'),
+      showCancelButton: true,
+      cancelButtonText: i18n.t('Cancel'),
+    });
+    return isConfirmed;
+  })();
+
+  const isConfirmed = await Promise.race([promise1, promise2]);
+  if (!isConfirmed) return undefined;
+
+  return Object.fromEntries(Object.entries(parameters).map(([key, parameter]) => [key, parameter.value]));
 }
 
 

src/ffmpeg-parameters.js

@@ -0,0 +1,34 @@
+import i18n from 'i18next';
+
+export const blackdetect = () => ({
+  black_min_duration: {
+    value: '2.0',
+    hint: i18n.t('Set the minimum detected black duration expressed in seconds. It must be a non-negative floating point number.'),
+  },
+  picture_black_ratio_th: {
+    value: '0.98',
+    hint: i18n.t('Set the threshold for considering a picture "black".'),
+  },
+  pixel_black_th: {
+    value: '0.10',
+    hint: i18n.t('Set the threshold for considering a pixel "black".'),
+  },
+});
+
+export const silencedetect = () => ({
+  noise: {
+    value: '-60dB',
+    hint: i18n.t('Set noise tolerance. Can be specified in dB (in case "dB" is appended to the specified value) or amplitude ratio. Default is -60dB, or 0.001.'),
+  },
+  duration: {
+    value: '2.0',
+    hint: i18n.t('Set silence duration until notification (default is 2 seconds).'),
+  },
+});
+
+export const sceneChange = () => ({
+  minChange: {
+    value: '0.3',
+    hint: i18n.t('Minimum change between two frames to be considered a new scene. A value between 0.3 and 0.5 is generally a sane choice.'),
+  },
+});

src/ffmpeg.js

@@ -108,12 +108,8 @@ function getIntervalAroundTime(time, window) {
   };
 }
 
-export async function readFrames({ filePath, aroundTime, window, streamIndex }) {
-  let intervalsArgs = [];
-  if (aroundTime != null) {
-    const { from, to } = getIntervalAroundTime(aroundTime, window);
-    intervalsArgs = ['-read_intervals', `${from}%${to}`];
-  }
+export async function readFrames({ filePath, from, to, streamIndex }) {
+  const intervalsArgs = from != null && to != null ? ['-read_intervals', `${from}%${to}`] : [];
   const { stdout } = await runFfprobe(['-v', 'error', ...intervalsArgs, '-show_packets', '-select_streams', streamIndex, '-show_entries', 'packet=pts_time,flags', '-of', 'json', filePath]);
   const packetsFiltered = JSON.parse(stdout).packets
     .map(p => ({
@@ -126,6 +122,12 @@ export async function readFrames({ filePath, aroundTime, window, streamIndex })
   return sortBy(packetsFiltered, 'time');
 }
 
+export async function readFramesAroundTime({ filePath, streamIndex, aroundTime, window }) {
+  if (aroundTime == null) throw new Error('aroundTime was nullish');
+  const { from, to } = getIntervalAroundTime(aroundTime, window);
+  return readFrames({ filePath, from, to, streamIndex });
+}
+
 // https://stackoverflow.com/questions/14005110/how-to-split-a-video-using-ffmpeg-so-that-each-chunk-starts-with-a-key-frame
 // http://kicherer.org/joomla/index.php/de/blog/42-avcut-frame-accurate-video-cutting-with-only-small-quality-loss
 export function getSafeCutTime(frames, cutTime, nextMode) {
@@ -548,12 +550,63 @@ export async function renderWaveformPng({ filePath, aroundTime, window, color })
   }
 }
 
+const getInputSeekArgs = ({ filePath, from, to }) => [
+  ...(from != null ? ['-ss', from.toFixed(5)] : []),
+  '-i', filePath,
+  ...(to != null ? ['-t', (to - from).toFixed(5)] : []),
+];
+
+const getSegmentOffset = (from) => (from != null ? from : 0);
+
+function adjustSegmentsWithOffset({ segments, from }) {
+  const offset = getSegmentOffset(from);
+  return segments.map(({ start, end }) => ({ start: start + offset, end: end != null ? end + offset : end }));
+}
+
+export function mapTimesToSegments(times) {
+  const segments = [];
+  for (let i = 0; i < times.length; i += 1) {
+    const start = times[i];
+    const end = times[i + 1];
+    if (start != null) segments.push({ start, end }); // end undefined is allowed (means until end of video)
+  }
+  return segments;
+}
+
+// https://stackoverflow.com/questions/35675529/using-ffmpeg-how-to-do-a-scene-change-detection-with-timecode
+export async function detectSceneChanges({ filePath, duration, minChange, onProgress, from, to }) {
+  const args = [
+    '-hide_banner',
+    ...getInputSeekArgs({ filePath, from, to }),
+    '-filter_complex', `select='gt(scene,${minChange})',metadata=print:file=-`,
+    '-f', 'null', '-',
+  ];
+  const process = execa(getFfmpegPath(), args, { encoding: null, buffer: false });
+
+  const times = [0];
+
+  handleProgress(process, duration, onProgress);
+  const rl = readline.createInterface({ input: process.stdout });
+  rl.on('line', (line) => {
+    const match = line.match(/^frame:\d+\s+pts:\d+\s+pts_time:([\d.]+)/);
+    if (!match) return;
+    const time = parseFloat(match[1]);
+    if (Number.isNaN(time) || time <= times[times.length - 1]) return;
+    times.push(time);
+  });
+
+  await process;
+
+  const segments = mapTimesToSegments(times);
+
+  return adjustSegmentsWithOffset({ segments, from });
+}
+
+
 export async function detectIntervals({ filePath, duration, customArgs, onProgress, from, to, matchLineTokens }) {
   const args = [
     '-hide_banner',
-    ...(from != null ? ['-ss', from.toFixed(5)] : []),
-    '-i', filePath,
-    ...(to != null ? ['-t', (to - from).toFixed(5)] : []),
+    ...getInputSeekArgs({ filePath, from, to }),
     ...customArgs,
     '-f', 'null', '-',
   ];
@@ -571,8 +624,7 @@ export async function detectIntervals({ filePath, duration, customArgs, onProgre
   handleProgress(process, duration, onProgress, customMatcher);
 
   await process;
-  const offset = from != null ? from : 0;
-  return segments.map(({ start, end }) => ({ start: start + offset, end: end + offset }));
+  return adjustSegmentsWithOffset({ segments, from });
 }
 
 const mapFilterOptions = (options) => Object.entries(options).map(([key, value]) => `${key}=${value}`).join(':');

src/hooks/useKeyframes.js

@@ -2,7 +2,7 @@ import { useState, useCallback, useRef, useEffect, useMemo } from 'react';
 import sortBy from 'lodash/sortBy';
 import useDebounceOld from 'react-use/lib/useDebounce'; // Want to phase out this
 
-import { readFrames, findNearestKeyFrameTime as ffmpegFindNearestKeyFrameTime } from '../ffmpeg';
+import { readFramesAroundTime, findNearestKeyFrameTime as ffmpegFindNearestKeyFrameTime } from '../ffmpeg';
 
 const maxKeyframes = 1000;
 // const maxKeyframes = 100;
@@ -26,7 +26,7 @@ export default ({ keyframesEnabled, filePath, commandedTime, mainVideoStream, de
       if (!shouldRun) return;
 
       try {
-        const promise = readFrames({ filePath, aroundTime: commandedTime, streamIndex: mainVideoStream.index, window: ffmpegExtractWindow });
+        const promise = readFramesAroundTime({ filePath, aroundTime: commandedTime, streamIndex: mainVideoStream.index, window: ffmpegExtractWindow });
         readingKeyframesPromise.current = promise;
         const newFrames = await promise;
         if (aborted) return;

src/smartcut.js

@@ -1,6 +1,6 @@
 import { getRealVideoStreams, getVideoTimebase } from './util/streams';
 
-import { readFrames } from './ffmpeg';
+import { readFramesAroundTime } from './ffmpeg';
 
 const { stat } = window.require('fs-extra');
 
@@ -18,7 +18,7 @@ export async function getSmartCutParams({ path, videoDuration, desiredCutFrom, s
   const videoStream = videoStreams[0];
 
   async function readKeyframes(window) {
-    const frames = await readFrames({ filePath: path, aroundTime: desiredCutFrom, streamIndex: videoStream.index, window });
+    const frames = await readFramesAroundTime({ filePath: path, aroundTime: desiredCutFrom, streamIndex: videoStream.index, window });
     return frames.filter((frame) => frame.keyframe);
   }
 

src/util/constants.js

@@ -0,0 +1,3 @@
+// anything more than this will probably cause the UI to become unusably slow
+// eslint-disable-next-line import/prefer-default-export
+export const maxSegmentsAllowed = 2000;