Issue with transcoding only with LiveTV

Hello,

So it appears that I have an issue with my LiveTV setup. I am observing some stuttering every few seconds but not everytime.
I started investigate and it appears that I have some difficulties transcoding my live stream :

Feb 15, 2018 22:44:47.449 [0x7f913eff8700] VERBOSE -  * speed => 0.9
Feb 15, 2018 22:44:47.953 [0x7f913dbff700] VERBOSE -  * speed => 0.8
Feb 15, 2018 22:44:48.378 [0x7f913eff8700] VERBOSE -  * speed => 0.4
Feb 15, 2018 22:44:48.472 [0x7f913fffa700] VERBOSE -  * speed => 1.2
Feb 15, 2018 22:44:48.870 [0x7f9140ffc700] VERBOSE -  * speed => 2.4
Feb 15, 2018 22:44:48.976 [0x7f913f7f9700] VERBOSE -  * speed => 0.9
Feb 15, 2018 22:44:49.520 [0x7f913dbff700] VERBOSE -  * speed => 1.4
Feb 15, 2018 22:44:50.024 [0x7f9140ffc700] VERBOSE -  * speed => 0.7
Feb 15, 2018 22:44:50.105 [0x7f913eff8700] VERBOSE -  * speed => 0.0
Feb 15, 2018 22:44:50.544 [0x7f913f7f9700] VERBOSE -  * speed => 1.2
Feb 15, 2018 22:44:50.590 [0x7f913eff8700] VERBOSE -  * speed => 2.6
Feb 15, 2018 22:44:51.056 [0x7f914f5e4700] VERBOSE -  * speed => 1.0

I am even hitting a speed of 0.0 sometimes. I can’t explain it.

But when I am transcoding something like a movie or a TV Show, I have clearly no problems at all :

Feb 15, 2018 22:53:29.457 [0x7fd06cfff700] VERBOSE -  * speed => 4.9
Feb 15, 2018 22:53:29.971 [0x7fd06bffd700] VERBOSE -  * speed => 5.1
Feb 15, 2018 22:53:30.485 [0x7fd06affb700] VERBOSE -  * speed => 4.5
Feb 15, 2018 22:53:30.979 [0x7fd06cfff700] VERBOSE -  * speed => 4.5
Feb 15, 2018 22:53:31.486 [0x7fd07c7ff700] VERBOSE -  * speed => 7.3
Feb 15, 2018 22:53:31.989 [0x7fd06affb700] VERBOSE -  * speed => 7.4
Feb 15, 2018 22:53:32.485 [0x7fd0791e4700] VERBOSE -  * speed => 7.3
Feb 15, 2018 22:53:32.999 [0x7fd07c7ff700] VERBOSE -  * speed => 7.3
Feb 15, 2018 22:53:33.502 [0x7fd0791e4700] VERBOSE -  * speed => 5.5
Feb 15, 2018 22:53:33.999 [0x7fd06cfff700] VERBOSE -  * speed => 4.6

Any ideas ?
Thanks.

Max