Public bug reported:
Binary package hint: vlc
The audio-sync function does not appear to work correctly in VLC 1.1.4
Ubuntu 10.10 Maverick.
Symptom
After initial audio/video sync up using audio-desync, the audio/video
sync
drifts out noticably within a few minutes and significantly in an hour
or
so.
The standard Ubuntu Lucid 10.04 VLC 1.0.6 version performs correctly
The MS windows (XP) version 1.1.4 performs correctly
Test case
Same Hardware and software setup in both Ubuntu test cases
Video in: PCI analog capture card (bt878video pci capture card,
Hauppauge
VCB Impact)
Audio in: Soundcard line-in
Std desktop install Ubuntu versions using Std default repos
+VLC, +ffmpeg libavdevice-extra52, +x264
Broadcast TV analog out used as test input source. Video into capture
card, audio into sound card ( I would usually be using analogue camera
and
mic/line in)
Procedure
1 Open GUI, test video/audio capture, by "Open Capture device" - Play
2 Select Streaming from menu, select Capture device tab, all input
settings left at default
3 select Stream, Next, Next , Paste output string into textbox, as
follows
--sout-keep --audio-desync=-40
:sout=#transcode{vcodec=h264,vb=600,deinterlace,ab=64,fps=25,width=160,height=120,acodec=mp3,samplerate=44100
,audio-sync}:duplicate{dst=std{access=http
{mime=video/x-flv},mux=ffmpeg{mux=flv},dst=0.0.0.0:8082/stream.flv},dst=display}
Audio-desync value adjusted to initial optimum value (predetermined
before
test)
Width and height set to low values to minimise cpu load
Same procedure in all cases including Win XP. Win test using similar
hardware, bt878 pci capture card.
Appendix
Suspected that pulseaudio may be the cause:
Removed pulseaudio and installed alsa mixer. Problem persisted.
Also tried VLC 1.1.5 from Maverick Bleed PPA. Problem persisted
Also tried VLC 1.1.4 from Lucid Bleed PPA with Lucid. Problem here as
well.
Reported problem to Videolan Trac
Response as follows.
Changes (by courmisch): * status: new => closed* resolution: =>
incomplete* component: I don't know => Access
Comment: And I bet you get the same effect if you just render the inputs
locally,no? Then I would tend to blame the V4L2 and ALSA input plugins
for not timestamping correctly. Or it might even be a driver bug.
Ticket URL: http://trac.videolan.org/vlc/ticket/4315#comment:2
I did not see the problem when playing capture device, only when streaming.
ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: vlc 1.1.4-1ubuntu1.1
ProcVersionSignature: Ubuntu 2.6.35-23.41-generic 2.6.35.7
Uname: Linux 2.6.35-23-generic i686
NonfreeKernelModules: nvidia
Architecture: i386
Date: Mon Dec 6 23:18:34 2010
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
ProcEnviron:
LANG=en_GB.utf8
SHELL=/bin/bash
SourcePackage: vlc
** Affects: vlc (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug i386 maverick
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https://bugs.launchpad.net/bugs/686248
Title:
Audio sync problem streaming ubuntu 10.10 VLC 1.1.4
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