CPU and RAM usage alerts #

If your hardware is being maxed out then your video may not be processed and delivered fast enough to keep up with the real-time requirements of live video.

Here are some steps you can try taking to resolve this.

  1. You may have too many quality variants defined in your configuration. Try limiting yourself to a single option, and go from there.
  2. Change to a faster encoder preset in your configuration. If you’re currently using veryfast, try superfast, for example.
  3. Try reducing the quality of the video you’re sending to Owncast in your broadcasting software.
  4. Experiment with reducing the bitrate and framerate of your video.
  5. If you’ve gone down to a single variant, changed the encoder preset to the fastest, and experimented with different qualities in your broadcasting software, it’s possible the server you’re running Owncast is just not powerful enough for the task and you might need to try a different environment to run this on.

In general, the easiest way to save CPU is to decrease the input size, decrease the output size, or both.

Buffering and video playback issues #

Many things can be responsible for buffering and issues with the video playback. Here are some things to look into.

  1. Make sure your hardware is not throwing errors as detailed above.
  2. Make sure your broadcasting computer is broadcasting live video reliably. If your own computer or network connection is having a hard time getting video to the internet then viewers will be stuck in a buffering state. Reduce the bitrate in your broadcasting software on your computer or mobile device if needed.
  3. Try increasing the values for chunkLengthInSeconds and maxNumberInPlaylist in the config file. This will start the user further behind live but give the client more playable video before it gets stuck waiting for the live edge.
  4. Change your video stream quality settings to a faster preset.
  5. Reduce your stream quality settings to a single variant and a lower bitrate. Experiment with increasing the bitrate and adding another optional stream quality once you find settings that work for you.
  6. If you are using external storage, make sure you’re able to upload to this storage service fast enough. See below.

Slow uploads to external storage #

If you have a slow upload connection, or are uploading to an external storage service that is too far away, or not optimized for fast uploads, you may run into an issue where it takes too long to get the video segments uploaded, ultimately not making them available fast enough for them to be used.

  1. Determine if there’s another endpoint for your storage service that might be geographically closer to you.
  2. Use a storage service that’s as close (physically and logically) to where your Owncast instance is. For example if if you’re on an AWS machine, use a S3 bucket in the same region. If you’re on Digital Ocean, try DO Spaces. But maybe don’t use DO Spaces if you’re on a Linode machine, use Linode Object Storage instead. Run owncast with --enableVerboseLogging to see if you get any slow upload warnings.
  3. Try to increase your upload speed from your server provider.
  4. Find out if your storage service offers something like AWS’s Transfer Acceleration to (possibly) try to increase the speed of uploads.
  5. Reduce the quality of your video so the video segments are smaller and will take less time to upload. See the above tips such as changing the encoder preset and reducing the bitrate or framerate.

Reducing the delay between the viewer and live #

Try decreasing the values for chunkLengthInSeconds and maxNumberInPlaylist in the config file. This will keep the user closer to live, but give the client less playable segments to work with, leaving less room for any network blips. In general the viewer will be approximately chunkLengthInSeconds * maxNumberInPlaylist seconds behind live. If you have a machine that is able to process video quickly you may be able to get down to 8-10 seconds, but with little room for error.

It’s up to you to decide you want lower delays over less reliability or a more reliable stream with additional delay.