[gstreamer-bugs] [Bug 414684] New: GStreamer sometimes skips first samples of audio

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | don't know | Ver: 0.10.x

           Summary: GStreamer sometimes skips first samples of audio
           Product: GStreamer
           Version: 0.10.x
          Platform: Other
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: don't know
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: alex at weej.com
         QAContact: gstreamer-bugs at lists.sourceforge.net
     GNOME version: 2.17/2.18
   GNOME milestone: Unspecified


Test case:

gst-launch-0.10 filesrc location="Desktop/test.ogg" ! decodebin ! audioconvert
! alsasink

This manifests itself in every GStreamer media player. Skipping tracks in
Rhythmbox gives a good chance of it happening. Sometimes it doesn't skip,
sometimes it skips up to what sounds like maybe a quarter of a second.

Totem has the same odds.

Interestingly, Pausing either of these players and seeking to the beginning of
a track causes the skip consistently, without fail. This may be another bug.

Of course, you only notice this for tracks with audio right at the start of
their streams. Here is a test track that you can use:

http://djlxj.com/tracks/files/Thrillseekers%20-%20Synaesthesia%20%5bLXJ%20Remix%5d.ogg

The beginning of the audio is very close to zero, so playing this file properly
should give no pop at the beginning, but a clear kick drum, instead. In many
cases, the peak of the kick drum is skipped entirely.

Have tested this with ice1712 and emu10k1 ALSA output drivers, with or without
ALSA plug, and with files of MP3, Ogg Vorbis and FLAC formats.


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