Connect Rendi and Slack

Rendi runs FFmpeg commands in the cloud, so long encodes finish while nobody is watching. FlowMattic picks up each completed command and tells the right Slack channel or person, with the output link, a review reminder or the file itself. For video teams, podcast editors and developers who batch media jobs.

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1 trigger 14 actions 6 example workflows 2 ready-made templates Unlimited runs

Try a pairing

When this happens in Rendi1 trigger

Do this in Slack14 actions

1. TriggerFFmpeg Command Completed

2. ActionSend Channel Message

When Rendi fires FFmpeg Command Completed, FlowMattic runs Send Channel Message in Slack with the data from that event.

You build this in the FlowMattic workflow builder on your own site. See the setup steps

Rendi and Slack workflows you can build

Each one uses only triggers and actions the two integrations ship today, plus FlowMattic's own tools. Where the library has a ready-made template, import it instead of building from scratch.

Ready-made template

Post a message when an FFmpeg command finishes

The media channel gets the command and its output link as soon as Rendi reports completion, so editors stop refreshing a dashboard to see if the render is done.

FFmpeg Command CompletedSend Channel Message

View the template

Send video and audio jobs to their own channels

A Router reads the output file type in the completion data. Video encodes go to the video team and audio exports to the podcast channel, so each group sees only its own work.

FFmpeg Command CompletedRouterSend Channel Message

Share the finished clip in a review channel

Upload File puts a short output, such as a thumbnail or a trailer cut, straight into the review channel, so feedback happens in the thread next to the file.

FFmpeg Command CompletedUpload File

Message yourself when a long batch encode completes

Freelancers who start a heavy job before leaving the desk get a Slackbot direct message on their phone with the output link and can deliver to the client from there.

FFmpeg Command CompletedSend Direct Message

Set a quality-check reminder for every finished render

Add Reminder asks the editor to watch the output before it is published, a small check that catches a wrong bitrate or a cropped frame before the audience does.

FFmpeg Command CompletedSend Channel MessageAdd Reminder

Show a running count of finished jobs

A Counter adds one for each completed command and the channel message carries the total, which helps when a team pushes a season of episodes through in one day.

FFmpeg Command CompletedCounterSend Channel Message

Set up: completed commands to Slack

At the end, each Rendi FFmpeg command that completes posts its details and output link to a Slack channel.

Connect Slack
Under Connects in FlowMattic, add a Slack connection for the workspace your media team uses.
Start with FFmpeg Command Completed
Create a workflow with Rendi and FFmpeg Command Completed, and follow the trigger's instructions so Rendi reports finished commands to the workflow.
Run a small test command
Run a quick conversion in Rendi so FlowMattic captures the completion data, including the command ID and output files.
Post to the channel
Add Send Channel Message, choose the channel, include the command ID and output link, test the step and switch the workflow on.

Import the ready-made template Beginner, about 5 min to set up

Rendi app icon — Built on the FlowMattic canvas. Test each step with real data, then switch the workflow on.

Slack app icon — Built on the FlowMattic canvas. Test each step with real data, then switch the workflow on.

From Rendi	To Slack
Command ID	Message: job
Status	Message: result
Output file URL	Message: download link
Completed at	Message: finished

Triggers and actions in this pair

A trigger starts a workflow. An action is something FlowMattic does in the app as a step.

Good to know

Every finished command fires the trigger, including test runs. Add a Filter on a field you control, such as the output file name, if only some jobs should post.
The field names come from Rendi's completion data, so the mapping above is an example. Check the captured test run before building a Router on file type or status.
For large video files, post the output link rather than using Upload File, and keep Upload File for thumbnails, stills and short clips.

Rendi

Integration page

Triggers (1)

FFmpeg Command CompletedTriggers upon FFmpeg command completion.

Slack

Integration page

Actions (14)

Send Channel MessagePost or Schedule a new message to a specific #channel
Add ReminderAdds a reminder for the user
Create ChannelCreates a new channel
List All ChannelsRetrieve list of all channels
Set Channel TopicSets the topic on a selected channel
Set StatusSets your Slack status to the given text and emoji
Invite User To ChannelInvite an existing User to an existing Channel. You must be a member of the channel to invite someone to it
Find User by EmailFinds a user by matching against their email instead of their username
Find User by IDFinds a user by their ID.
Send Direct MessageSend a direct message to a user or yourself from the Slackbot. Can also schedule a message for later
Send Private Channel MessagePost a new message to a private channel you choose. Can also schedule a message for later
Update ProfileUpdate basic profile fields such as name or title
Find MessageFinds a Slack message using the Slack Search feature
Upload FileUpload file to your slack workplace

Why run this pair with FlowMattic

Rendi and Slack connect through FlowMattic on your own site, with no separate automation account in the middle and no charge per run.

Renders announce themselves

Nobody has to watch a long encode. The team hears in Slack when the output is ready and can move to review or delivery.

Review happens next to the file

Uploading short outputs to a review channel keeps comments, approvals and the clip in one thread.

Batch days cost the same

FlowMattic runs on your WordPress site with unlimited runs, so a day with hundreds of completed commands adds no per-task charge.

Common questions

How do I get a Slack notification when a Rendi job finishes?

Create a FlowMattic workflow with the Rendi FFmpeg Command Completed trigger, connect it as the trigger describes, then add Slack Send Channel Message or Send Direct Message with the output link in the text.

Can I post only failed commands?

If the completion data carries a status, add a Filter after the trigger that passes only failed runs, and send those to the developers' channel. Check a captured run to see which status values Rendi sends.

Can the output file appear in Slack instead of a link?

Yes. Use the Upload File action with the output URL from the trigger. It suits stills and short clips. Long, high-bitrate videos are easier to share as a link.

Can one workflow notify more than one team?

Yes. A Router after the trigger can send each completed command down a different path, for example by file type or by a prefix you add to output names, each ending in its own Slack step.

Did not find your answer? You can browse the help center or ask us directly.

Start automating Rendi and Slack

Install FlowMattic, connect both accounts and import a template. Every run stays on your own server.

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Reviewed 27 Oct 2026. The example workflows are written with AI from the real triggers and actions of both integrations and checked against them. Rendi integration 1.0.0, Slack integration 1.0.