make it more explicit when changing mp4 to mov

and show a notification #1075

issues.md

@@ -87,9 +87,9 @@ Smart cut is experimental, so don't expect too much. But if you're having proble
 - If Smart cut gives you repeated (duplicate) segments, you can try to enable the Export Option "Shift all start times".
 - Sometimes it helps to convert (remux) your videos [to mp4 first](https://github.com/mifi/lossless-cut/discussions/1292#discussioncomment-10425084) (e.g. from mkv) using LosslessCut, before smart cutting them.
 
-## My file changes from MP4 to MOV
+## MP4/MOV issues
 
-Some MP4 files ffmpeg is not able to export as MP4 and therefore needs to use MOV instead. Unfortunately I don't know any way to fix this.
+Some MP4 files FFmpeg is not able to export as MP4 and MOV needs to be selected instead. Unfortunately I don't know any way to fix this. Sometimes certain players are not able to play back certain exported `.mov` files ([Adobe Premiere](https://github.com/mifi/lossless-cut/issues/1075#issuecomment-2327459890) 👀). You can try to rename the exported MOV file extension to `.mp4` and see if it helps. Or vice versa, rename an exported MP4 file to `.mov`.
 
 ## Output file name is missing characters
 

src/renderer/src/App.tsx

@@ -58,6 +58,7 @@ import {
   isIphoneHevc, isProblematicAvc1, tryMapChaptersToEdl,
   getDuration, getTimecodeFromStreams, createChaptersFromSegments,
   RefuseOverwriteError, extractSubtitleTrackToSegments,
+  mapRecommendedDefaultFormat,
 } from './ffmpeg';
 import { shouldCopyStreamByDefault, getAudioStreams, getRealVideoStreams, isAudioDefinitelyNotSupported, willPlayerProperlyHandleVideo, doesPlayerSupportHevcPlayback, getSubtitleStreams, getVideoTrackForStreamIndex, getAudioTrackForStreamIndex, enableVideoTrack, enableAudioTrack } from './util/streams';
 import { exportEdlFile, readEdlFile, loadLlcProject, askForEdlImport } from './edlStore';
@@ -1305,7 +1306,6 @@ function App() {
       // console.log('file meta read', fileMeta);
 
       const fileFormatNew = await getDefaultOutFormat({ filePath: fp, fileMeta });
-
       if (!fileFormatNew) throw new Error('Unable to determine file format');
 
       const timecode = autoLoadTimecode ? getTimecodeFromStreams(fileMeta.streams) : undefined;
@@ -1373,8 +1373,14 @@ function App() {
       if (!haveVideoStream) setWaveformMode('big-waveform');
       setMainFileMeta({ streams: fileMeta.streams, formatData: fileMeta.format, chapters: fileMeta.chapters });
       setCopyStreamIdsForPath(fp, () => copyStreamIdsForPathNew);
-      setFileFormat(outFormatLocked || fileFormatNew);
       setDetectedFileFormat(fileFormatNew);
+      if (outFormatLocked) {
+        setFileFormat(outFormatLocked);
+      } else {
+        const recommendedDefaultFormat = mapRecommendedDefaultFormat({ sourceFormat: fileFormatNew, streams: fileMeta.streams });
+        if (recommendedDefaultFormat.message) showNotification({ icon: 'info', text: recommendedDefaultFormat.message });
+        setFileFormat(recommendedDefaultFormat.format);
+      }
 
       // only show one toast, or else we will only show the last one
       if (existingHtml5FriendlyFile) {

src/renderer/src/components/ConcatDialog.tsx

@@ -8,7 +8,7 @@ import invariant from 'tiny-invariant';
 import Checkbox from './Checkbox';
 
 import { ReactSwal } from '../swal';
-import { readFileMeta, getDefaultOutFormat } from '../ffmpeg';
+import { readFileMeta, getDefaultOutFormat, mapRecommendedDefaultFormat } from '../ffmpeg';
 import useFileFormatState from '../hooks/useFileFormatState';
 import OutputFormatSelect from './OutputFormatSelect';
 import useUserSettings from '../hooks/useUserSettings';
@@ -69,8 +69,8 @@ function ConcatDialog({ isShown, onHide, paths, onConcat, alwaysConcatMultipleFi
       const fileFormatNew = await getDefaultOutFormat({ filePath: firstPath, fileMeta: fileMetaNew });
       if (aborted) return;
       setFileMeta(fileMetaNew);
-      setFileFormat(fileFormatNew);
       setDetectedFileFormat(fileFormatNew);
+      setFileFormat(mapRecommendedDefaultFormat({ sourceFormat: fileFormatNew, streams: fileMetaNew.streams }).format);
       setUniqueSuffix(Date.now());
     })().catch(console.error);
 

src/renderer/src/ffmpeg.ts

@@ -236,27 +236,28 @@ export async function createChaptersFromSegments({ segmentPaths, chapterNames }:
 }
 
 /**
- * ffmpeg only supports encoding certain formats, and some of the detected input
- * formats are not the same as the muxer name used for encoding.
+ * Some of the detected input formats are not the same as the muxer name used for encoding.
  * Therefore we have to map between detected input format and encode format
  * See also ffmpeg -formats
  */
-function mapDefaultFormat({ streams, requestedFormat }: { streams: FFprobeStream[], requestedFormat: string | undefined }) {
-  if (requestedFormat === 'mp4') {
-    // Only MOV supports these codecs, so default to MOV instead https://github.com/mifi/lossless-cut/issues/948
-    // eslint-disable-next-line unicorn/no-lonely-if
-    if (streams.some((stream) => pcmAudioCodecs.includes(stream.codec_name))) {
-      return 'mov';
-    }
-  }
-
-  // see sample.aac
+function mapInputToOutputFormat(requestedFormat: string | undefined) {
+  // see file aac raw adts.aac
   if (requestedFormat === 'aac') return 'adts';
 
   return requestedFormat;
 }
 
-async function determineOutputFormat(ffprobeFormatsStr: string | undefined, filePath: string) {
+export function mapRecommendedDefaultFormat({ streams, sourceFormat }: { streams: FFprobeStream[], sourceFormat: string | undefined }) {
+  // Certain codecs cannot be muxed by ffmpeg into mp4, but in MOV they can
+  // so we default to MOV instead in those cases https://github.com/mifi/lossless-cut/issues/948
+  if (sourceFormat === 'mp4' && streams.some((stream) => pcmAudioCodecs.includes(stream.codec_name))) {
+    return { format: 'mov', message: i18n.t('This file contains an audio track that FFmpeg is unable to mux into the MP4 format, so MOV has been auto-selected as the default output format.') };
+  }
+
+  return { format: sourceFormat };
+}
+
+async function determineSourceFileFormat(ffprobeFormatsStr: string | undefined, filePath: string) {
   const ffprobeFormats = (ffprobeFormatsStr || '').split(',').map((str) => str.trim()).filter(Boolean);
 
   const [firstFfprobeFormat] = ffprobeFormats;
@@ -342,10 +343,10 @@ async function determineOutputFormat(ffprobeFormatsStr: string | undefined, file
   }
 }
 
-export async function getDefaultOutFormat({ filePath, fileMeta: { format, streams } }: { filePath: string, fileMeta: { format: Pick<FFprobeFormat, 'format_name'>, streams: FFprobeStream[] } }) {
-  const assumedFormat = await determineOutputFormat(format.format_name, filePath);
+export async function getDefaultOutFormat({ filePath, fileMeta: { format } }: { filePath: string, fileMeta: { format: Pick<FFprobeFormat, 'format_name'> } }) {
+  const assumedFormat = await determineSourceFileFormat(format.format_name, filePath);
 
-  return mapDefaultFormat({ streams, requestedFormat: assumedFormat });
+  return mapInputToOutputFormat(assumedFormat);
 }
 
 export async function readFileMeta(filePath: string) {

src/renderer/src/util.ts

@@ -221,7 +221,7 @@ export function getOutFileExtension({ isCustomFormatSelected, outFormat, filePat
     // https://github.com/mifi/lossless-cut/issues/1075#issuecomment-1072084286
     const hasMovIncorrectExtension = outFormat === 'mov' && inputExt.toLowerCase() !== '.mov';
 
-    // OK, just keep the current extension. Because most players will not care about the extension
+    // OK, just keep the current extension. Because most other players will not care about the extension
     if (!hasMovIncorrectExtension) return inputExt;
   }