Red Hat Bugzilla – Bug 465757
gstreamer or pulseaudio adds terrible amount of noise making it
Last modified: 2008-11-06 08:57:40 EST
Created attachment 319532 [details]
debug log when playing the WAV file via gst-launch
Description of problem:
Tried to play my music with Rhythmbox and the level of noise much bigger than actual sound, so that it is actually unusable. In order to find out where is the problem, I have tried with gst-launch and the results are interesting. I have tried also to play the same file with mplayer (using PA) and playing wav files with paplay and both work just fine without any problems.
When trying to play the same MP3 file with gst-launch
$ gst-launch filesrc location=Ubuntu-startup.ogg '!' \
decodebin '!' audioconvert '!' audioresample '!' pulsesink
I got gst-launch-log.txt (to be attached), and no sound. Without debugging information it says just:
[matej@viklef gst-sounds]$ LANG=en_IE.utf-8 gst-launch filesrc location=Ubuntu-startup.ogg '!' decodebin '!' audioconvert '!' audioresample '!' autoaudiosink
Setting pipeline to PAUSED ...
E: shm.c: shm_open() failed: Permission denied
Pipeline is PREROLLING ...
Pipeline is PREROLLED ...
Setting pipeline to PLAYING ...
New clock: GstAudioSinkClock
Got EOS from element "pipeline0".
Execution ended after 8113381349 ns.
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
FREEING pipeline ...
CPU goes to 100% for couple of seconds and then it just finished with making some one-sec-or-so sound but nothing else.
Interesting thing was when trying to convert to WAV with gst:
gst-launch filesrc location=Ubuntu-startup.ogg '!' decodebin '!' audioconvert '!' audioresample '!' progressreport '!' audio/x-raw-int,rate=44100,channels=1 '!' volume volume=5 '!' wavenc '!' filesink location=Ubuntu-startup-gst.wav >gst-launch-log.txt 2>&1
the resulting sound is MUCH better (guessing by playing with paplay) than what happened in Rhythmbox, but still it is by far not as perfect as the result of ogg123. (ogg123 playing to -d oss with padsp or without any device at all -- which I guess means alsa-pulse-plugins -- works just as perfectly).
Version-Release number of selected component (if applicable):
Steps to Reproduce:
nice crisp sound as with ogg123+paplay
Created attachment 319533 [details]
debug log when converting ogg to wav
Created attachment 319534 [details]
original OGG sound
Created attachment 319535 [details]
what I get from gst-launch
Created attachment 319536 [details]
what I get from ogg123 -- how it should sound like
Just to emphasize this is "Intel(R) Core(TM)2 Duo CPU T7300 @ 2.00GHz" -- so there should be plenty of horsepower for playing WAV files ;-).
Either pulseaudio-0.9.12-6.fc10 or
gstreamer-plugins-good-0.10.10-5.fc10 just made this work. Weird.
OK, so this is probably pulseaudio, reassigning and reopening.
Created attachment 319640 [details]
OK, so this looks like a problem in pulseaudio. After rebooting of the computer with new pulseaudio (currently I have pulseaudio-libs-0.9.13-1.fc10.i386) and gstreamer-plugins-good (I have gstreamer-plugins-good-0.10.10-5.fc10.i386 now), everything seemed to work. However, after playing a podcast for couple of minutes in Rhythmbox, I lost the sound and rhythmbox process went to 100% CPU. I killed RB and since then no GStreamer based application is able to play anything. mplayer (with pa backend) still works like a charm.
play something with "padsp realplay", after 35 or 36 minutes playing, the sound stops while the pictures are still moving fine. When it is played to the end, "padsp realplay" crashes. Sound comes back if run "padsp realplay" again. Is this a same problem?
Still not working. Trying with
$ gst-launch playbin uri=$(curl -s http://www.wbur.org/listen/feed/ogg.m3u)
produces 100% garbage in the speakers.
[matej@viklef tmp]$ rpm -qa \*pulse\* \*gstreamer\*
mplayer, and lonely paplay works just fine.
Created attachment 320657 [details]
output of gst-launch -v playbin uri=$(curl -s http://www.wbur.org/listen/feed/ogg.m3u)
This sounds absolutely terrible
Created attachment 320658 [details]
gst-launch -v souphttpsrc location=$(curl -s http://www.wbur.org/listen/feed/ogg.m3u) '!' decodebin '!' audioconvert '!' audioresample '!' alsasink
Actually, this is not a perfect but sounds well enough to be listenable. So, maybe it is something about PulseAudio anyway.
We've updated PulseAudio recently - can you retest?
Sorry, this has been fixed sometime ago.