Unity启动，录制视频没有文件产出

src/recording/composer.ts

@@ -55,7 +55,7 @@ type CompositionInputSets = {
 
 type VideoTimelineSegment = {
   startMs: number;
-  endMs: number;
+  endMs: number | null;
   activeInputs: ServerTrackRecordingFile[];
 };
 
@@ -275,8 +275,10 @@ function getVideoTimelineSegments(
     }
 
     const activeInputs = sortActiveVideoInputs(files.filter((file) => {
-      const inputStartMs = getInputStartMs(file) || timelineOriginMs;
-      const inputEndMs = getInputEndMs(file) || timelineEndMs;
+      const fileStartMs = getInputStartMs(file);
+      const fileEndMs = getInputEndMs(file);
+      const inputStartMs = fileStartMs === null ? timelineOriginMs : fileStartMs;
+      const inputEndMs = fileEndMs === null ? timelineEndMs : fileEndMs;
       return inputStartMs < endMs && inputEndMs > startMs;
     }));
     segments.push({ startMs, endMs, activeInputs });
@@ -285,6 +287,17 @@ function getVideoTimelineSegments(
   return segments;
 }
 
+function getFallbackVideoTimelineSegment(
+  files: ServerTrackRecordingFile[],
+  timelineOriginMs: number | null
+): VideoTimelineSegment {
+  return {
+    startMs: timelineOriginMs === null ? 0 : timelineOriginMs,
+    endMs: null,
+    activeInputs: sortActiveVideoInputs(files)
+  };
+}
+
 export function buildFfmpegCompositionArgs(input: {
   videoInputs: ServerTrackRecordingFile[];
   audioInputs: ServerTrackRecordingFile[];
@@ -299,7 +312,10 @@ export function buildFfmpegCompositionArgs(input: {
   const timelineOriginMs = getTimelineOriginMs(videoInputs.concat(input.audioInputs));
   const timelineEndMs = getTimelineEndMs(videoInputs.concat(input.audioInputs));
   const timelineDurationSeconds = getTimelineDurationSeconds(videoInputs.concat(input.audioInputs), timelineOriginMs);
-  const videoSegments = getVideoTimelineSegments(videoInputs, timelineOriginMs, timelineEndMs);
+  const timelineVideoSegments = getVideoTimelineSegments(videoInputs, timelineOriginMs, timelineEndMs);
+  const videoSegments = timelineVideoSegments.length > 0
+    ? timelineVideoSegments
+    : [getFallbackVideoTimelineSegment(videoInputs, timelineOriginMs)];
   const args = ['-y'];
   const orderedInputs = videoInputs.concat(input.audioInputs);
   orderedInputs.forEach((file) => {
@@ -322,8 +338,11 @@ export function buildFfmpegCompositionArgs(input: {
   });
 
   videoSegments.forEach((segment, segmentIndex) => {
-    const segmentDurationSeconds = (segment.endMs - segment.startMs) / 1000;
+    const segmentDurationSeconds = segment.endMs === null ? null : (segment.endMs - segment.startMs) / 1000;
     if (segment.activeInputs.length === 0) {
+      if (segmentDurationSeconds === null) {
+        return;
+      }
       filters.push(`color=color=black:size=${outputWidth}x${outputHeight}:rate=30:duration=${formatSeconds(segmentDurationSeconds)},format=yuv420p[seg${segmentIndex}]`);
       return;
     }
@@ -333,7 +352,8 @@ export function buildFfmpegCompositionArgs(input: {
       const inputLabel = videoInputUseCounts[inputIndex] > 1
         ? `vin${inputIndex}_${videoInputUsePositions[inputIndex]++}`
         : `${inputIndex}:v`;
-      const inputStartMs = getInputStartMs(file) || segment.startMs;
+      const fileStartMs = getInputStartMs(file);
+      const inputStartMs = fileStartMs === null ? segment.startMs : fileStartMs;
       const trimStartSeconds = Math.max(0, (segment.startMs - inputStartMs) / 1000);
       const width = segment.activeInputs.length === 1
         ? outputWidth
@@ -341,7 +361,11 @@ export function buildFfmpegCompositionArgs(input: {
       const height = segment.activeInputs.length === 1
         ? outputHeight
         : activeIndex === 0 ? hostHeight : bottomHeight;
-      filters.push(`[${inputLabel}]trim=start=${formatSeconds(trimStartSeconds)}:duration=${formatSeconds(segmentDurationSeconds)},setpts=PTS-STARTPTS,scale=${width}:${height}:force_original_aspect_ratio=decrease,pad=${width}:${height}:(ow-iw)/2:(oh-ih)/2:black,setsar=1[seg${segmentIndex}v${activeIndex}]`);
+      const trimOptions = [`start=${formatSeconds(trimStartSeconds)}`];
+      if (segmentDurationSeconds !== null) {
+        trimOptions.push(`duration=${formatSeconds(segmentDurationSeconds)}`);
+      }
+      filters.push(`[${inputLabel}]trim=${trimOptions.join(':')},setpts=PTS-STARTPTS,scale=${width}:${height}:force_original_aspect_ratio=decrease,pad=${width}:${height}:(ow-iw)/2:(oh-ih)/2:black,setsar=1[seg${segmentIndex}v${activeIndex}]`);
     });
 
     if (segment.activeInputs.length === 1) {
@@ -435,6 +459,16 @@ function toOutput(job: RecordingCompositionJob, target: ServerTrackRecordingTarg
   };
 }
 
+function getActiveCompositionJob(input: StartCompositionInput): RecordingCompositionJob | null {
+  const recordingId = normalizeOption(input.recordingId, '');
+  const meetingId = normalizeOption(input.meetingId, '');
+  return Array.from(jobs.values()).find((job) => {
+    return job.recordingId === recordingId
+      && job.meetingId === meetingId
+      && (job.status === 'queued' || job.status === 'running');
+  }) || null;
+}
+
 async function runRecordingCompositionJob(job: RecordingCompositionJob): Promise<RecordingCompositionJob> {
   const timestamp = nowIso();
   job.status = 'running';
@@ -489,6 +523,11 @@ async function runRecordingCompositionJob(job: RecordingCompositionJob): Promise
 }
 
 export function startRecordingCompositionJob(input: StartCompositionInput): RecordingCompositionJob {
+  const activeJob = getActiveCompositionJob(input);
+  if (activeJob) {
+    return activeJob;
+  }
+
   const timestamp = nowIso();
   const inputSets = getInputSets(input);
   const job: RecordingCompositionJob = {