[pvrusb2] Occasional audio issue with recordings

[Jan Ceuleers]

Dear pvrusb2 list,

Ever so often one of my HVR1950 tuners, which records from a
directly-connected set-top box, gets into a state where audio is damaged
such that it cannot be played using either MythTV nor MPlayer. Video is
fine, but audio is damaged.

A sample can be found here:

https://gofile.io/?c=DQSKjQ

Judging by the loud click when starting playback, along with the
occasional crackling that can be heard it sounds as if a large DC offset
has been added to the audio signal such that the audio decoder's output
is saturated. But that's just an assumption.

The only way to recover is to reboot -- when the driver once again
becomes removable I'm sure an rmmod/modprobe cycle will be enough. That
is: it is not necessary also to power cycle the tuner itself.

I have already excluded the possibility of these symptoms being caused
by an iffy power supply.

Any hints would be gratefully received.

Best regards, Jan