Hi Johan, did you experience broken sound with 14.04? We have upgraded our servers to 14.04 and the problem appears to be gone.
Regards, Rüdiger On 22.04.2014 11:00, Johan Kragsterman wrote: > > Hej, Rüdiger! > > Thanks for your input! > > No one else on this list seem to bother...but strangly there are people > that got sound on 12.04, but perhaps it is broken on 13.10? > > Anyway, I upgraded to 14.04 now, and I will run som more tests, both > with fat clients, and with thin clients with local apps. > > Do you run just thin clients(with local apps), or do you have the same > experience with fat clients? > > Which version are you running? > > I try to confirm your tests/theories, and get back to you, but I don't > have much time right now... > > Strange that I haven't heard anything about this before, it SHOULD be a > big issue in the edubuntu community, as far as I could imagine...? > > > > Best regards from/Med vänliga hälsningar från > > Johan Kragsterman > > Capvert > > > -----Rüdiger Kupper <k...@kg-fds.de> skrev: ----- > Till: ltsp-discuss@lists.sourceforge.net > Från: Rüdiger Kupper <k...@kg-fds.de> > Datum: 2014-04-22 10:03 > Ärende: Re: [Ltsp-discuss] Ang: no sound on fat clients > > Hello Johan, > > I believe I see the same problem on our thin clients, and I have a > theory what makes the sound break. I believe that the problem is related > to the sample rate of the sound you try to play. > > Regarding your experiments with a DVB stream and youtube, I'd expect > that the DVB stream comes with 48 kHz audio sampling rate, while the > youtube video had 44.1 kHz? > > I can completely reproduce your results with two sample audio files, one > with 44.1 kHz and one with 48 kHz sample rate. Here is what I see: > > Test1: > - I boot up the thin client and open the 44.1 kHz file, it works. > > Test 2: > - I boot up the thin client and open the 48 kHz file. From what the > player shows, it appears to play, but I have no sound. > - I close that file and open the 44.1 kHz file (the one that worked fine > in test 1), and have no sound either. > - Sound will not come back until I reboot the client. > > Test 3: > - I boot up the thin client and open the 44.1 kHz file. I have sound. > - I keep this file playing (endless loop). In parallel I open the 48 kHz > file. I have sound, both files play together. > > In short, my theory is that 48 kHz playback breaks pulseaudio on LTSP > clients. > > So why does test 3 work? When you first play a 44.1 kHz audio stream and > in parallel open a 48 kHz stream, I believe pulseaudio will sample down > the second stream to 44.1 kHz to mix it into the already playing stream. > That's why audio works in test 3, and that also constitutes a workaround. > > Workaround: Tell your users to open up a 44.1 kHz youtube video, start > to play and pause it, keep the browser window open. After that sound > will work and stay up, no matter what file they play. > > This is really just a workaround, but our users were very thankful > having it (we use LTSP in classrooms, and the difference of having or > not having sound can well break or make a teacher's complete lesson...) > > In any case, it would be much better to really fix the problem. > > > So, Johan, I'd ask you to confirm my three test cases above. I can > supply two sample mp3 files if you need, please give me a note. It will > be no difference what software you use for playback, as long as it uses > pulseaudio (VLC is fine). > > If you confirm the test, we need some pulseaudio or LTSP developer to > (a) find the reason, and/or (b) tell us if pulseaudio can be set up to > generally downsample all audio to 44.1 kHz on our clients. > > > Looking forward to seeing your results, > best regards, > Rüdiger > > > > On 13.04.2014 07:37, Johan Kragsterman wrote: > >> The results are strange.... >> >> If I start with VLC, directly after the newly booted client, and > ltsp-localapps pulseaudio -nC: >> >> ltsp-localapps vlc: >> >> VLC recieving dvb streams from my TV-server(mumudvb) doesn't play any > sound, though it displays that sound is in the stream, and it lets me > choose the local sound device to use(Just a note: This works perfect on > a normal workstation). >> >> If I start with google-chrome, and youtube, directly after the newly > booted client, and ltsp-localapps pulseaudio -nC: >> >> It seem to work fine with the sound, though the video quality is not fine. >> >> If I start VLC AFTER I started google-chrome/youtube where the sound > is already working, sound is actually working on vlc as well, though NOT > in all channels...!?!!? > >> So, I don't really know what I'm doing here, just doing experiments, > and reports back to list. >> >> But any hints here would be appreciated, and a strategy for solving > this would be fine! > > -- > Dr. Rüdiger Kupper <k...@kg-fds.de> > Kepler-Gymnasium Freudenstadt > > ------------------------------------------------------------------------------ > Start Your Social Network Today - Download eXo Platform > Build your Enterprise Intranet with eXo Platform Software > Java Based Open Source Intranet - Social, Extensible, Cloud Ready > Get Started Now And Turn Your Intranet Into A Collaboration Platform > http://p.sf.net/sfu/ExoPlatform > _____________________________________________________________________ > Ltsp-discuss mailing list. To un-subscribe, or change prefs, goto: > https://lists.sourceforge.net/lists/listinfo/ltsp-discuss > For additional LTSP help, try #ltsp channel on irc.freenode.net > > > [bilagan "signature.asc" borttagen av Johan Kragsterman/Capvert] > > > ------------------------------------------------------------------------------ > Start Your Social Network Today - Download eXo Platform > Build your Enterprise Intranet with eXo Platform Software > Java Based Open Source Intranet - Social, Extensible, Cloud Ready > Get Started Now And Turn Your Intranet Into A Collaboration Platform > http://p.sf.net/sfu/ExoPlatform > > > > _____________________________________________________________________ > Ltsp-discuss mailing list. To un-subscribe, or change prefs, goto: > https://lists.sourceforge.net/lists/listinfo/ltsp-discuss > For additional LTSP help, try #ltsp channel on irc.freenode.net > -- Dr. Rüdiger Kupper <k...@kg-fds.de> Kepler-Gymnasium Freudenstadt
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