Control: tags -1 unreproducible
* Andoru <aekk...@gmail.com> [2017-11-14 23:45 +0200]: > > > > Just run htop while an alsa-process needs high cpu load. Copy the > > line which shows that from (h)top to this bug report. Or just file a > > screenshot to a puplic server somewhere. > > > > Alright: > VLC playing a FLAC file on the default device: > > > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ > COMMAND > > 26183 andoru 20 0 1191000 66424 46296 S 13.6 0.8 0:09.43 vlc > ___________________________________________________________________________________________________ > > VLC playing the same file with "Analog Front Speakers" subdevice selected > under Audio -> Audio Device: > > > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ > COMMAND > > 26183 andoru 20 0 1195412 69176 48644 S 1.3 0.9 0:11.35 vlc > > ___________________________________________________________________________________________________ > > As you can see, the CPU decreased from 13.6% to 1.3% when switching the > device. I tried that on 3 different soundcards. I don't get vlc as a htop COMMAND. It is always /usr/bin/vlc. Please tell me how you fired up vlc. The %CPU usage isn't reproducible on none of the soundcards handy for me. > ___________________________________________________________________________________________________ > To confirm that this is not an issue with the decoder in VLC here's VLC > playing an OGG Vorbis file on the default device: > > > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ > COMMAND > > 26183 andoru 20 0 1263372 76228 48368 S 18.3 1.0 0:15.95 vlc > ___________________________________________________________________________________________________ > > Same test as above, this time with an MP3 file: > > > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ > COMMAND > > 26183 andoru 20 0 1416816 91532 60188 S 17.0 1.2 0:19.64 vlc > > ___________________________________________________________________________________________________ > > And foobar2000 playing FLAC OGG and MP3 files, respectively: I don't know how you got foobar2000 into Debian but this isn't¬ maintained in the repos, so not relevant to this bug. > Also, in the initial report, I forgot to mention that when I select "Analog > Front Speakers" subdevice in VLC, with some decoders (particularly APE) and > when the sample rate is below 44100Hz, I can hear some distortion > (crackling on high pitched sounds), so I'm guessing the high CPU usage is > maybe due to an inefficient resampler? Try to cancel all pulseaudio stuff and test again. Let me know.... Elimar -- Never make anything simple and efficient when a way can be found to make it complex and wonderful ;-)
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