Call experience#

There are multiple factors which can have a smaller and bigger impact on the experience of a call.

Automatic selection of sent video quality#

Since version 8.0.8 Nextcloud Talk will automatically select the sent video quality depending on the number of participants sending video and/or audio streams. Both counters are checked and then the lowest matching quality is selected.

If a participant enabled their microphone and starts speaking the video quality is set to "High" for the duration of them talking plus an additional grace period of 5 seconds.

Number of video streams#

Streams	Quality
< 20	High
21-80	Medium
80-119	Low / Very low
> 120	Thumbnail

Number of audio streams#

Streams	Quality
< 40	High
40-79	Medium
80-119	Low
120-199	Very low
> 200	Thumbnail

Video qualities#

Frames: - Max frames: 30 - Ideal frames: 30 - Min frames: 20

Quality	Max width	Ideal width	Min width	Max height	Ideal height	Min height
High	-	-	1440	-	-	1080
Medium	-	-	720	-	-	540
Low	640	560	480	480	420	320
Very low	480	360	320	320	270	240
Thumbnail	320	-	-	240	-	-

These values were last changes in Nextcloud Talk 24.0.1, 23.0.7 and 22.0.14

Judging the connection quality#

Similar since version 9.0.2 Nextcloud Talk is having an eye on the lost packages and the "round trip time" of the stream data. When the connection is too bad or no data could be transmitted at all, the participant will be informed to try to disable their own video and screen share. If those two are already off, the participant will see a message that their connection bandwidth or device cannot withhold the necessary load for participating in a call.

The critical values are:

Lost packages: 30% in the last 5 seconds

Too few packages: Less than 10 packages per second

Round trip time: above 1.5 seconds