From cb3297d70a34bf22c3f807518989d1728823e548 Mon Sep 17 00:00:00 2001
From: Jake Howard <git@theorangeone.net>
Date: Wed, 27 Oct 2021 22:25:30 +0100
Subject: [PATCH] Add notes about how to downmix audio

---
 notes/ffmpeg-downmixing-audio.md | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 notes/ffmpeg-downmixing-audio.md

diff --git a/notes/ffmpeg-downmixing-audio.md b/notes/ffmpeg-downmixing-audio.md
new file mode 100644
index 0000000..4328cbb
--- /dev/null
+++ b/notes/ffmpeg-downmixing-audio.md
@@ -0,0 +1,15 @@
+---
+title: Downmixing audio channels
+tags:
+  - Media
+emoji: 🎵
+link: https://trac.ffmpeg.org/wiki/AudioChannelManipulation
+---
+
+```bash
+ls -1 *.mp4 | xargs -I{} ffmpeg -y -i {} -ac 2 -c:v copy /path/to/out/{}
+```
+
+Downmixes multi-channel audio into stereo. Reduces the chances of weird things happening during playback.
+
+`-c:v copy` is important for performance as it means the video isn't re-encoded (10x improvement in speed).