[PLUG] Audio hum when playing Blu-ray movie

[Denis Heidtmann]

John,

I do not know much about what you describe, but you could answer the
frequency issue by recording the sound into Audacity on the laptop.
(Assuming you do not have a 'scope.)

Is there a chance that the connections which produce the hum include two
different AC powered devices with a (not quite) common ground?

-Denis

On Mon, Jun 19, 2017 at 10:33 PM, John Jason Jordan <johnxj at gmx.com> wrote:

> You can't play Blu-ray movies on Linux, right? Wrong. You can if you
> give $50 for a license for MakeMKV. Not only will MakeMKV for Linux rip
> and encode a Blu-ray movie to a .mkv file, if you follow the
> instructions in their forums you can get VLC to play the discs
> directly.
>
> I did this successfully on my laptop first, as that is my usual
> platform for making .mkv files. It works perfectly. But I use my
> desktop for viewing movies, so that was my next step. Both machines are
> Xubuntu 14.04. The desktop installation went perfectly and MakeMKV sees
> and will rip and encode a Blu-ray movie. (Both machines have Blu-ray
> drives.) I followed the same instructions on the desktop as I did on the
> laptop for getting VLC to play a Blu-ray movie, and it does so, but
> there is a loud hum, loud enough to drown out the audio in the movie. I
> would say it is a 60-Herz hum, except that it seems just a bit higher.
> This is strange because the desktop spends all day streaming internet
> radio stations to my stereo, and the output is beautiful - no hum. And
> the laptop play the same Blu-ray movie without hum.
>
> There is a difference in the source of the audio signal, of course. For
> internet radio Banshee is connecting to the stream and sending the
> audio signal to the stereo. For the movie the source is the Blu-ray
> drive, although I don't know how it is processed into the signal that
> goes to the stereo. Note that the same Blu-ray drive on the desktop
> plays DVD movies without the hum. (I currently own only one Blu-ray
> movie.) It also plays television over the air through my HDHomeRun
> tuner, which uses VLC, also without issue.
>
> I poked around in Pulseaudio volume control on the desktop and failed
> to resolve the problem.
>
> I need some clues.
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