diff --git a/29/apache/Dockerfile b/29/apache/Dockerfile
index 3ca9ab54..1fb89a86 100644
--- a/29/apache/Dockerfile
+++ b/29/apache/Dockerfile
@@ -9,6 +9,7 @@ RUN set -ex; \
     \
     apt-get update; \
     apt-get install -y --no-install-recommends \
+        ffmpeg \
         busybox-static \
         bzip2 \
         libldap-common \
diff --git a/29/fpm-alpine/Dockerfile b/29/fpm-alpine/Dockerfile
index 47179e44..6bd0f220 100644
--- a/29/fpm-alpine/Dockerfile
+++ b/29/fpm-alpine/Dockerfile
@@ -8,6 +8,7 @@ ENV IMAGICK_COMMIT_HASH d7d3c24af1b4f599897408f1714600b69a56473b
 RUN set -ex; \
     \
     apk add --no-cache \
+        ffmpeg \
         imagemagick \
         imagemagick-pdf \
         imagemagick-jpeg \
diff --git a/29/fpm/Dockerfile b/29/fpm/Dockerfile
index 3a984575..87d0e3ba 100644
--- a/29/fpm/Dockerfile
+++ b/29/fpm/Dockerfile
@@ -9,6 +9,7 @@ RUN set -ex; \
     \
     apt-get update; \
     apt-get install -y --no-install-recommends \
+        ffmpeg \
         busybox-static \
         bzip2 \
         libldap-common \
diff --git a/30/apache/Dockerfile b/30/apache/Dockerfile
index 472e005d..579629c6 100644
--- a/30/apache/Dockerfile
+++ b/30/apache/Dockerfile
@@ -9,6 +9,7 @@ RUN set -ex; \
     \
     apt-get update; \
     apt-get install -y --no-install-recommends \
+        ffmpeg \
         busybox-static \
         bzip2 \
         libldap-common \
diff --git a/30/fpm-alpine/Dockerfile b/30/fpm-alpine/Dockerfile
index b060e713..8c22fb4a 100644
--- a/30/fpm-alpine/Dockerfile
+++ b/30/fpm-alpine/Dockerfile
@@ -8,6 +8,7 @@ ENV IMAGICK_COMMIT_HASH d7d3c24af1b4f599897408f1714600b69a56473b
 RUN set -ex; \
     \
     apk add --no-cache \
+        ffmpeg \
         imagemagick \
         imagemagick-pdf \
         imagemagick-jpeg \
diff --git a/30/fpm/Dockerfile b/30/fpm/Dockerfile
index 85d0f477..3200d8a6 100644
--- a/30/fpm/Dockerfile
+++ b/30/fpm/Dockerfile
@@ -9,6 +9,7 @@ RUN set -ex; \
     \
     apt-get update; \
     apt-get install -y --no-install-recommends \
+        ffmpeg \
         busybox-static \
         bzip2 \
         libldap-common \
diff --git a/Dockerfile-alpine.template b/Dockerfile-alpine.template
index 2295bddf..242a493d 100644
--- a/Dockerfile-alpine.template
+++ b/Dockerfile-alpine.template
@@ -7,6 +7,7 @@ ENV IMAGICK_COMMIT_HASH d7d3c24af1b4f599897408f1714600b69a56473b
 RUN set -ex; \
     \
     apk add --no-cache \
+        ffmpeg \
         imagemagick \
         imagemagick-pdf \
         imagemagick-jpeg \
diff --git a/Dockerfile-debian.template b/Dockerfile-debian.template
index 8734caa9..72729fdf 100644
--- a/Dockerfile-debian.template
+++ b/Dockerfile-debian.template
@@ -8,6 +8,7 @@ RUN set -ex; \
     \
     apt-get update; \
     apt-get install -y --no-install-recommends \
+        ffmpeg \
         busybox-static \
         bzip2 \
         libldap-common \
diff --git a/README.md b/README.md
index 9f13f17c..7de62124 100644
--- a/README.md
+++ b/README.md
@@ -157,7 +157,7 @@ See:
 
 To use the [Nextcloud command-line interface](https://docs.nextcloud.com/server/latest/admin_manual/configuration_server/occ_command.html) (aka. `occ` command):
 ```console
-$ docker exec --user www-data CONTAINER_ID php occ
+$ docker exec -it --user www-data CONTAINER_ID php occ
 ```
 or for docker compose:
 ```console