[vdr] Video-Audio disruptions with 4.16+ kernel

Richard Scobie rascobie at slingshot.co.nz
Thu Apr 12 03:12:23 UTC 2018


Apologies in advance for a somewhat long-winded post.

I am using an Asrock Celeron based N3150M board with a TT S2 6400 card 
and a Digital Devices Cine S2 V7A card and 64bit kernels. The frontends 
on the TT card are unused in favour of the DD card - the TT card is just 
used for output. vdr is 2.3.9.

For a while now I have been assisting Daniel Scheller with testing his 
mainline kernel DD drivers prior to release:

https://github.com/herrnst/dddvb-linux-kernel

Up until a few days ago, all was well, using his dd 0.9.32 drivers in 
conjunction with kernel 4.15.0-rc6+.

The system was then updated to his dd 0.9.33 drivers and kernel 4.16+ 
and intermittent video/audio freezes of two to three seconds appeared. 
After some driver bisecting it turns out that this is being caused by 
the new kernel, not the dd drivers, (the problem occurs with the old 
drivers in the new kernel.).

I am unsure quite where to start, to work out which kernel update has 
caused this, but was hoping that the following log errors might point 
somewhere useful:

Apr 11 09:46:18 vdr vdr[718]: [874] ERROR: driver buffer overflow on 
device 1

Apr 11 09:57:20 vdr vdr[718]: [892] ERROR: 1 TS packet(s) not accepted 
in Transfer Mode

Apr 11 10:11:29 vdr vdr[718]: [914] ERROR: 6 TS packet(s) not accepted 
in Transfer Mode

Apr 11 10:21:13 vdr vdr[721]: [816] ERROR: driver buffer overflow on 
device 1
Apr 11 10:21:21 vdr vdr[721]: [816] ERROR: driver buffer overflow on 
device 1

Apr 11 10:39:33 vdr vdr[721]: [873] ERROR: 11 TS packet(s) not accepted 
in Transfer Mode

Apr 12 14:37:32 vdr vdr[922]: [957] ERROR: TS packet not accepted in 
Transfer Mode
Apr 12 14:37:32 vdr vdr[922]: [957] ERROR: TS packet not accepted in 
Transfer Mode
Apr 12 14:37:32 vdr vdr[922]: [957] ERROR: TS packet not accepted in 
Transfer Mode
Apr 12 14:37:33 vdr vdr[922]: [957] ERROR: TS packet not accepted in 
Transfer Mode
Apr 12 14:37:33 vdr vdr[922]: [957] ERROR: TS packet not accepted in 
Transfer Mode
Apr 12 14:37:34 vdr vdr[922]: [957] ERROR: TS packet not accepted in 
Transfer Mode
Apr 12 14:37:34 vdr vdr[922]: [957] ERROR: TS packet not accepted in 
Transfer Mode
Apr 12 14:37:34 vdr vdr[922]: [957] ERROR: TS packet not accepted in 
Transfer Mode

The effect coinciding with these, is a frozen picture and mute audio for 
up to several seconds.

Any help much appreciated.

Kind regards,

Richard Scobie



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