> ## Documentation Index
> Fetch the complete documentation index at: https://docs.dfine.app/llms.txt
> Use this file to discover all available pages before exploring further.

# FAQ

> Answers to the questions we hear most often, for streaming and for review.

The questions we hear most often. The first section covers both products, then each product has its own.

## About dfine.io

<AccordionGroup>
  <Accordion title="What is dfine.io?">
    dfine.io has two products. **Streaming Classic** streams your monitor live to clients in under a second. **Review** lets you upload a file, comment on the exact frame and share it for approval, and also runs live conferencing and HD or Premium livestreaming. See [Welcome](/en/welcome) to pick the right one.
  </Accordion>

  <Accordion title="Which browsers and devices are supported?">
    The latest Chrome and Safari, on both desktop and mobile.
  </Accordion>

  <Accordion title="Do the people I invite need an account?">
    <Tabs>
      <Tab title="Streaming Classic">
        No. Viewers open your access link and watch in the browser. An account is only for people who manage streams.
      </Tab>

      <Tab title="Review">
        No. You send a link and your client reviews in the browser. An account is only for people who manage projects.
      </Tab>
    </Tabs>
  </Accordion>
</AccordionGroup>

## Streaming Classic

<AccordionGroup>
  <Accordion title="What resolutions and codecs are supported?">
    HD up to UHD (4K), with H.264 and VP8 today. AV1 and H.265 are coming soon.
  </Accordion>

  <Accordion title="What is the latency?">
    Under one second.
  </Accordion>

  <Accordion title="What bitrates are supported?">
    Up to 25 Mbit/s on ingest, with adaptive or constant bitrate. Your plan sets the maximum, and a stream above it is paused automatically. For good quality we recommend at least 3500 kbit/s.
  </Accordion>

  <Accordion title="What hardware do you recommend?">
    dfine.io is hardware independent. OBS is our recommended software encoder. Many devices also work, such as NDI sources, TeraDek Slice and Bolt, AJA HELO, Blackmagic ATEM and WebPresenter, and the Kiloview E1. See [Compatibility](/en/compatibility).
  </Accordion>

  <Accordion title="Where do I find the ingest URL and stream key?">
    Open **Settings**, **Ingest** for the ingest URL, and open a stream slot for its key. See [Where do I find the ingest server URL?](/en/where-do-i-find-the-ingest-server-url) and [Where do I find the stream key?](/en/where-do-i-find-the-stream-key).
  </Accordion>

  <Accordion title="How do I set up OBS?">
    Install OBS, import our profile, then enter your ingest URL and stream key. See [Install the OBS profile](/en/profile-installation) and [OBS settings (RTMPS)](/en/settings-rtmps).
  </Accordion>

  <Accordion title="Why is my stream blocked?">
    A stream is paused automatically when the ingest bitrate is higher than your plan allows. Lower the bitrate within your plan, then unblock and restart it from the dashboard. See [The stream is jittering](/en/the-stream-is-jittering-using-obs) and [Ingest does not work](/en/ingest-does-not-work).
  </Accordion>

  <Accordion title="Can I play the stream back to a reference monitor?">
    Yes. Activate the monitor link in the stream settings, generate a link and play it out in OBS. See [Blackmagic SDI monitoring](/en/blackmagic-sdi-monitoring).
  </Accordion>

  <Accordion title="Are you TISAX certified?">
    As a software provider we are not certified ourselves, because we do not run the data center. We can run your streams on TISAX certified servers in Frankfurt through our partnership with Google, offered as an optional upgrade. You can also run a streaming server on premises.
  </Accordion>
</AccordionGroup>

## Review

<AccordionGroup>
  <Accordion title="Which file types can I upload?">
    Almost any video, image or audio file. Everyday formats like MP4, MOV, JPG, PNG and WAV play right in the browser. Professional and design formats, for example R3D, ARI, EXR, DPX, PSD, HEIC and camera RAW, plus PDF and office files, are stored for download instead of browser preview. See [Compatibility](/en/compatibility).
  </Accordion>

  <Accordion title="How large can a file be?">
    Up to 50 GB per file, and up to 250 files per upload. Larger files are uploaded in parts automatically, so a short connection drop does not restart the whole upload.
  </Accordion>

  <Accordion title="What is the difference between Original and Optimized?">
    The original is your uploaded file at full quality. The optimised version is a lighter copy we create for smooth playback. You can switch between them in the preview.
  </Accordion>

  <Accordion title="How much storage do I get?">
    Storage and the number of files depend on your plan. The free plan includes a small amount for trying things out, and paid plans add much more. See [Plans and billing](/en/review/billing).
  </Accordion>

  <Accordion title="How long do share links last?">
    You choose when you create the link: 24 hours, 7 days (the default), a custom date, or never.
  </Accordion>

  <Accordion title="How do I control who can open a link?">
    A share link can be open to anyone with the link, or protected with a password. You can also set what recipients are allowed to do, and turn a link off at any time from **Shared Access**.
  </Accordion>

  <Accordion title="Can I protect single folders?">
    Yes. You can set a password on a folder so only people with the password can open it. A forgotten folder password cannot be recovered, but a project owner can remove the protection and set a new one.
  </Accordion>
</AccordionGroup>

## Security and account

<AccordionGroup>
  <Accordion title="Which protocols and encryption do you use?">
    <Tabs>
      <Tab title="Streaming Classic">
        Ingest runs over RTMPS with SSL. Playout runs over WebRTC with SSL and TLS, AES 256 and DTLS encrypted streaming.
      </Tab>

      <Tab title="Review">
        Your work is protected with folder and link passwords, link expiry, two factor login and a full activity log, with all data region-pinned to the EU. See [Security and privacy](/en/review/security).
      </Tab>
    </Tabs>
  </Accordion>

  <Accordion title="Where is my data stored?">
    In Germany, inside the European Union. For streaming you can also choose TISAX certified servers in Frankfurt or an on-premises server.
  </Accordion>

  <Accordion title="How do I turn on two factor authentication?">
    Turn on 2FA in your security settings with a mobile authenticator app such as Google Authenticator.
  </Accordion>

  <Accordion title="Can I pause or cancel my subscription?">
    You can cancel any time before the current period ends, and your plan stays active until then. Billing belongs to the account owner.
  </Accordion>

  <Accordion title="How do I contact support?">
    Write to [support@dfine.io](mailto:support@dfine.io) or use the [contact page](https://dfine.io/contact). You can also join us on [Slack](https://slack.dfine.io).
  </Accordion>
</AccordionGroup>