Peertube: High bitrate limit on transcoding

[XenonFiber]

• PeerTube version or URL:
  beta.7
• Browser name/version:
  Firefox 60.0.1

• NodeJS version:
  v8.11.2

• What is the expected behaviour?
  Standard seeded playback without a "large" amount of buffering mid playback or reloading in HTTP.

• What do you see instead?
  Playing certain videos at 1080p is causing a lot of buffering until it falls back to HTTP (always before halfway, usually earlier). Allowing it to transcode down the resolution (only tested at 480p so far) lets it automatically drop down and stops this from happening.

Examples:

• Only 1080p: https://dialup.express/videos/watch/7b503a9b-36ec-4599-a6b7-441f0cbbe013
• Both 1080p and 480p: https://dialup.express/videos/watch/f9b569e1-e34b-4245-ba40-2b6efe504112

My server has 1891.32 down and 172.86 up, so bandwidth isn't an issue on that end. The speed on my end is 61.2 down and 5.32 up, so it's probably not that either.

The only reason this seems unusual is because I haven't seen another instance have problems like this, and I don't seen any reason for (unusual) playback issues.

• Browser console log if useful (Gist/Pastebin...):
  https://pastebin.com/gzaZYYm7 (this is from before I started using the workaround, so it couldn't lower the resolution)

[Chocobozzz]

This video is particular since it has a very high bitrate (~19Mb/s for the 1080p). There is nothing we can really do.

If you made the video, maybe you could try to use less effects on the video to reduce the size.

[rigelk]

I guess this calls for a higher limit to the bitrate in the transcoding parameters.

[XenonFiber]

@Chocobozzz I just checked the rendering preset I use, and its max is definitely way too high. What would you say is the highest safe rate PeerTube can handle?

[Chocobozzz]

For 1080p ~ 4Mbit/s would be fine.