--- patch/media/filters/audio_file_reader.cc	2022-09-01 22:34:26.814779500 +0200
+++ patch/media/filters/audio_file_reader.cc.duration	2022-09-05 21:43:11.707061527 +0200
@@ -243,10 +243,10 @@ bool AudioFileReader::OnNewFrame(
   // silence from being output. In the case where we are also discarding some
   // portion of the packet (as indicated by a negative pts), we further want to
   // adjust the duration downward by however much exists before zero.
-  if (audio_codec_ == AudioCodec::kAAC && frame->duration) {
+  if (audio_codec_ == AudioCodec::kAAC && frame->pkt_duration) {
     const base::TimeDelta pkt_duration = ConvertFromTimeBase(
         glue_->format_context()->streams[stream_index_]->time_base,
-        frame->duration + std::min(static_cast<int64_t>(0), frame->pts));
+        frame->pkt_duration + std::min(static_cast<int64_t>(0), frame->pts));
     const base::TimeDelta frame_duration =
         base::Seconds(frames_read / static_cast<double>(sample_rate_));