Have you ever wondered why some videos open without a problem on a Mac but won't budge on an Apple phone? The world of video technology is split between the .webm and .mp4 formats. Different operating systems and browsers (Safari, Chrome, Firefox) have their own favourite codecs.
Our system solves this problem in the background. Whether you record on an iPhone or an old laptop, the server converts every recording to an MP4 file (H.264 codec, AAC audio). That format plays in Safari on iPhone, Chrome on Android, and Safari, Chrome and Firefox on a computer. You don't have to convert anything.
What happens inside the browser
Recording relies on two browser features: access to the camera and microphone, and recording of the stream. The browser chooses the format it can write itself. On some devices that will be WebM, on others MP4. That is why the same “record” button can produce different files.
The recording stays on the device only until it is uploaded. Then the server receives the file, checks it and converts it to the common format. When the organiser assembles the film, every clip already has the same format, so it doesn't matter which phone recorded it.
What the browser needs
- A current browser version. The latest releases of Chrome, Safari and Firefox work most reliably. An older browser may show a message that recording is not supported.
- Permission for the camera and microphone. The browser asks the first time you record. Without permission you won't see a preview.
- A secure connection. Recording works over HTTPS, that is an address starting with
https://. The browser itself requires this. - A free camera. If another app, such as a messenger, is using the camera, recording won't start. Close it and try again.
What to do when recording doesn't work
- Refresh the page and accept the camera permission again.
- Check the permissions in your browser settings. For the site's address, the camera and microphone should be allowed.
- Close other apps that use the camera.
- Try another browser, for example Safari on an iPhone or Chrome on Android.
- Update the system or the browser if you can.
If nothing helps, write to the organiser. Another device may be enough. You can also record with your phone's regular camera and send the file, if the organiser agrees.
Why one film plays on a Mac but not on an iPhone
The most common cause is the codec. Browser and system makers have long differed on what they consider the default. A file saved in one format may be read by a computer but rejected by a phone. That is why the service doesn't leave this decision to the person recording.
The MP4 standard with H.264 video and AAC audio is played by all the browsers and systems mentioned above. That is exactly the format saved in the finished film.
Summary
Recording in the browser needs no app and no account, but it works best in a current browser, with camera permission and over a secure connection. If something doesn't work, refreshing the page, closing other apps or switching browsers usually helps. The output format doesn't depend on your device.
