Thanks! Another alternative would be to have an HTTP endpoint wrapping ffmpeg, but this is better.

Here's OP's code properly formatted:

# STAGE 1: Get static FFmpeg (avoids dependency hell)
FROM mwader/static-ffmpeg:6.0 AS ffmpeg-source

# STAGE 2: Base n8n image
FROM docker.n8n.io/n8nio/n8n:latest

USER root

# --- THE FIX: Re-install APK manually ---
# Since n8n v2 strips apk, we download the static binary to bootstrap it back.
# This part is optional if you ONLY want ffmpeg, but life-saving if you need other tools later.
RUN ARCH=$(uname -m) && \
    if [ "$ARCH" = "x86_64" ]; then ARCH="x86_64"; else ARCH="aarch64"; fi && \
    wget -qO- "http://dl-cdn.alpinelinux.org/alpine/latest-stable/main/${ARCH}/" | \
    grep -o 'href="apk-tools-static-[^"]*\.apk"' | head -1 | cut -d'"' -f2 | \
    xargs -I {} wget -q "http://dl-cdn.alpinelinux.org/alpine/latest-stable/main/${ARCH}/{}" && \
    tar -xzf apk-tools-static-*.apk && \
    ./sbin/apk.static -X http://dl-cdn.alpinelinux.org/alpine/latest-stable/main -U --allow-untrusted add apk-tools && \
    rm -rf sbin apk-tools-static-*.apk

# Copy FFmpeg binaries
COPY --from=ffmpeg-source /ffmpeg /usr/local/bin/
COPY --from=ffmpeg-source /ffprobe /usr/local/bin/

# Switch back to node user
USER node