[vlc-devel] [PATCH] Add option to change network cache while playing video

Paulo Vitor Magacho da Silva pvmagacho at gmail.com
Tue Oct 27 13:02:38 CET 2015

2015-10-27 9:54 GMT-02:00 Rémi Denis-Courmont <remi at remlab.net>:

> Le 2015-10-27 14:51, Paulo Vitor Magacho da Silva a écrit :
>> Yes, PTZ means pan, tilt, zoom. The network cache introduces a delay
>> between the PTZ command and the video response. In a normal live
>> stream 500ms-1000ms is ok for network cache, but when using PTZ, a
>> reduced network cache around 100ms is more appropriate.
> This seems backward to me. If you can and sometimes need low latency, then
> just use low latency at all times.
The issue is that the application can have multiple videos being played. If
they all have low latency video can lag because of some packets being
delayed. A larger cache can cope with the network fluctuations.

When the application moves to PTZ enabled state all other videos are paused
allowing the application to receive data only from the PTZ enabled camera.
This way the latency can be reduced with a much lower probability to have
packets being delayed.

Thank you

> --
> Rémi Denis-Courmont
> http://www.remlab.net/
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