diff -Nru mrpt-2.4.9+ds/debian/changelog mrpt-2.4.9+ds/debian/changelog
--- mrpt-2.4.9+ds/debian/changelog	2022-06-17 14:13:50.000000000 +0000
+++ mrpt-2.4.9+ds/debian/changelog	2022-07-21 14:35:47.000000000 +0000
@@ -1,3 +1,9 @@
+mrpt (1:2.4.9+ds-4~rpi1) bookworm; urgency=medium
+
+  * Rebuild against ffmpeg 4.
+
+ -- Peter Michael Green <plugwash@raspbian.org>  Thu, 21 Jul 2022 14:35:47 +0000
+
 mrpt (1:2.4.9+ds-4) unstable; urgency=medium
 
   * Team upload.