[BUG] Paperclip::Error: Error while transcoding + 500 Error when Uploading Gifs #136
Description
Is there an existing issue for this?
- I have searched the existing issues
Current Behavior
When Users try to Upload a gif or video, they receive "500 Error processing thumbnail for uploaded media"
Expected Behavior
User should be able to upload Gifs and Videos just fine.
Steps To Reproduce
Use the following Config
Our docker-compose looks like this:
services:
db:
image: postgres:14-alpine
env_file:
- .env
container_name: mastodon_db
restart: unless-stopped
shm_size: 256mb
networks:
- mastodon_network
healthcheck:
test: ["CMD-SHELL", "pg_isready -d mastodon -U mastodon"]
interval: 10s
timeout: 5s
retries: 5
environment:
- POSTGRES_USER=${POSTGRES_USER}
- POSTGRES_PASSWORD=${POSTGRES_PASSWORD}
- POSTGRES_DB=${POSTGRES_DB}
volumes:
- /mnt/storage/postgres/data:/var/lib/postgresql/data
redis:
image: redis:7-alpine
env_file:
- .env
container_name: mastodon_redis
restart: unless-stopped
networks:
- mastodon_network
healthcheck:
test: ["CMD-SHELL", "redis-cli ping | grep PONG"]
interval: 10s
timeout: 5s
retries: 5
volumes:
- /mnt/storage/redis/data:/data
mastodon:
image: lscr.io/linuxserver/mastodon:latest
env_file:
- .env
container_name: mastodon
environment:
- PUID=1000
- PGID=1000
- TZ=Europe/Berlin
- NO_CHOWN= #optional
- LOCAL_DOMAIN=${LOCAL_DOMAIN}
- WEB_DOMAIN=${WEB_DOMAIN} #optional
- SITE_TITLE=${SITE_TITLE}
- SITE_SHORT_DESCRIPTION=${SITE_SHORT_DESCRIPTION}
- REGISTRATIONS_MODE=open # open | approved | none; no approval needed, as it is restricted by EMAIL_DOMAIN_ALLOWLIST
- EMAIL_DOMAIN_ALLOWLIST=SECRET
- SITE_CONTACT_USERNAME=admin # account has to exist
- SITE_CONTACT_EMAIL=SECRET
- REDIS_HOST=redis
- REDIS_PORT=6379
- DB_HOST=db
- DB_PORT=5432
- DB_USER=${POSTGRES_USER}
- DB_NAME=${POSTGRES_DB}
- DB_PASS=${POSTGRES_PASSWORD}
- DB_POOL=5 #optional
- SECRET_KEY_BASE=${SECRET_KEY_BASE}
- OTP_SECRET=${OTP_SECRET}
- VAPID_PRIVATE_KEY=${VAPID_PRIVATE_KEY}
- ACTIVE_RECORD_ENCRYPTION_PRIMARY_KEY=${ACTIVE_RECORD_ENCRYPTION_PRIMARY_KEY}
- ACTIVE_RECORD_ENCRYPTION_DETERMINISTIC_KEY=${ACTIVE_RECORD_ENCRYPTION_DETERMINISTIC_KEY}
- ACTIVE_RECORD_ENCRYPTION_KEY_DERIVATION_SALT=${ACTIVE_RECORD_ENCRYPTION_KEY_DERIVATION_SALT}
- SMTP_SERVER=${SMTP_SERVER}
- SMTP_PORT=${SMTP_PORT}
- SMTP_LOGIN=${SMTP_LOGIN}
- SMTP_PASSWORD=${SMTP_PASSWORD}
- SMTP_FROM_ADDRESS=${SMTP_LOGIN}
- SIDEKIQ_ONLY=false #optional
- SIDEKIQ_QUEUE= #optional
- SIDEKIQ_DEFAULT=false #optional
- SIDEKIQ_THREADS=5 #optional
- ES_ENABLED=false
- ES_HOST=es #optional
- ES_PORT=9200 #optional
- ES_USER=elastic #optional
- ES_PASS=elastic #optional
- S3_ENABLED=false
- S3_BUCKET= #optional
- AWS_ACCESS_KEY_ID= #optional
- AWS_SECRET_ACCESS_KEY= #optional
- S3_ALIAS_HOST= #optional
- MASTODON_PROMETHEUS_EXPORTER_ENABLED= #optional
volumes:
- /mnt/storage/config:/config
- ./mastodon-bootstrap:/custom-cont-init.d:ro
- ./docs/richtlinien:/richtlinien:ro
- ./mastodon-branding:/branding:ro
ports:
- ${LOCAL_PORT}:80
#- 443:443
- 9394:9394
restart: unless-stopped
depends_on:
db:
condition: service_healthy
redis:
condition: service_healthy
networks:
- mastodon_network
networks:
mastodon_network:
driver: bridge
ipam:
config:
- subnet: 10.10.10.0/24
and then try to upload Gifs or Videos
Environment
- OS:Debian GNU/Linux 13 (trixie)
- How docker service was installed: distro's packagemanager using this documentation https://docs.docker.com/engine/install/debian/CPU architecture
x86-64
Docker creation
Use docker compose with the specified ConfigContainer logs
> I, [2026-03-16T12:29:49.332953 #433] INFO -- : [dde59c48-d6ad-4e5b-a2ad-912d430e6cee] [paperclip] Trying to link /tmp/RackMultipart20260316-433-29abkk.mp4 to /tmp/a81df3ed1ecc0ec6df787ab132a3259c20260316-433-aqw0uh.mp4
I, [2026-03-16T12:29:49.333983 #433] INFO -- : [dde59c48-d6ad-4e5b-a2ad-912d430e6cee] [paperclip] Trying to link /tmp/a81df3ed1ecc0ec6df787ab132a3259c20260316-433-aqw0uh.mp4 to /tmp/bc1469b305cf03fb1cb4aad0919e862920260316-433-5rcung.mp4
I, [2026-03-16T12:29:49.334391 #433] INFO -- : [dde59c48-d6ad-4e5b-a2ad-912d430e6cee] Command :: file -b --mime '/tmp/bc1469b305cf03fb1cb4aad0919e862920260316-433-5rcung.mp4'
I, [2026-03-16T12:29:49.521903 #433] INFO -- : [dde59c48-d6ad-4e5b-a2ad-912d430e6cee] Command :: ffmpeg -nostdin -ss '0' -i '/tmp/a81df3ed1ecc0ec6df787ab132a3259c20260316-433-aqw0uh.mp4' -loglevel 'fatal' -vf 'scale='\''min(640\, iw):min(640\, ih)'\'':force_original_aspect_ratio=decrease' -f 'image2' -vframes '1' -y '/tmp/a81df3ed1ecc0ec6df787ab132a3259c20260316-433-aqw0uh20260316-433-caswzd.png'
E, [2026-03-16T12:29:49.665645 #433] ERROR -- : [dde59c48-d6ad-4e5b-a2ad-912d430e6cee] Paperclip::Error: Error while transcoding a81df3ed1ecc0ec6df787ab132a3259c20260316-433-aqw0uh: Command 'ffmpeg -nostdin -ss '0' -i '/tmp/a81df3ed1ecc0ec6df787ab132a3259c20260316-433-aqw0uh.mp4' -loglevel 'fatal' -vf 'scale='\''min(640\, iw):min(640\, ih)'\'':force_original_aspect_ratio=decrease' -f 'image2' -vframes '1' -y '/tmp/a81df3ed1ecc0ec6df787ab132a3259c20260316-433-aqw0uh20260316-433-caswzd.png'' returned nil. Expected 0
Here is the command output: STDOUT:
> STDERR:
> I, [2026-03-16T12:29:49.666450 #433] INFO -- : [dde59c48-d6ad-4e5b-a2ad-912d430e6cee] method=POST path=/api/v2/media format=html controller=Api::V2::MediaController action=create status=500 allocations=3589 duration=341.81 view=0.47 db=0.97