diff --git a/extract-left-audio.sh b/extract-left-audio.sh
new file mode 100644
index 0000000..5f77181
--- /dev/null
+++ b/extract-left-audio.sh
@@ -0,0 +1,3 @@
+#!/bin/bash
+FILENAME=$1
+ffmpeg -i ${FILENAME} -map_channel 0.1.0 ${FILENAME}.left.wav
diff --git a/join-audio-with-video.sh b/join-audio-with-video.sh
new file mode 100644
index 0000000..fcc7855
--- /dev/null
+++ b/join-audio-with-video.sh
@@ -0,0 +1,15 @@
+#!/bin/bash
+# extract files?
+#find . -type f -iname '*.VIDEOEXTENSION' -exec ffmpeg -i {} -vn -acodec copy {}.AUDIOEXTENSION \;
+
+ffmpeg \
+    -i domcode16-main-track-7-ancilla.MTS \
+    -i domcode16-main-track-7-ancilla.MTS.left.wav \
+    -c:v copy \
+    -map 0:v:0 \
+    -map 1:a:0 \
+    -vn \
+    domcode16-main-track-7-ancilla-audio-fixed.MTS
+
+
+
diff --git a/join-files.sh b/join-files.sh
new file mode 100644
index 0000000..af907b2
--- /dev/null
+++ b/join-files.sh
@@ -0,0 +1,2 @@
+#!/bin/bash
+ffmpeg -i "concat:domcode16-main-track-7-ancilla.MTS|domcode16-main-track-7-ancilla-2.MTS" domcode16-main-track-7-ancilla-joined.MTS
diff --git a/stereo-to-mono.sh b/stereo-to-mono.sh
new file mode 100644
index 0000000..7a17e8b
--- /dev/null
+++ b/stereo-to-mono.sh
@@ -0,0 +1,3 @@
+#!/bin/bash
+#ffmpeg -i domcode16-main-track-7-ancilla.MTS -map_channel 0.0.0 domcode16-main-track-7-ancilla-mono.MTS
+ffmpeg -i domcode16-main-track-7-ancilla.MTS  -map_channel 0.1.0 -ac 1 -c:v copy domcode16-main-track-7-ancilla-mono.MTS