[gstreamer-bugs] [Bug 541130] [avimux] full and fast recording

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gst-plugins-good | Ver: HEAD CVS




------- Comment #1 from Mark Nauwelaerts  2008-07-01 22:13 UTC -------
Thank you for taking the time to report this.  However:
* running the above pipeline is very likely (and does so on my system) to
produce only a very small amount of audio data, with a lot more video data
(because there will only be 10 small audio buffers).  It is therefore
impossible to have a/v sync (due to lack in audio)
* "replacing with audiotestsrc"; wat does "it works fine" then mean (since it
is hard to judge a/v sync in that case)
* there has been a bug in avimux (into the latest release) that caused a/v
desync in case of uncompressed raw audio; please make sure CVS HEAD is used

In any case, a slightly adjusted pipeline (to cater for hardware and above
comments) produces a fine result (that is; nothing jerky and a/v sync ok (*)):

gst-launch-0.10 v4l2src num-buffers=200 ! "video/x-raw-yuv,
format=(fourcc)YUY2, width=384, height=480, framerate=(fraction)25/1" ! \
queue ! avimux name=mux \
alsasrc buffer-time=500000 provide-clock=1 num-buffers=16 blocksize=48000 !
"audio/x-raw-int, rate=48000, channels=1" ! queue ! mux. \
mux. ! filesink location=record.avi

(*) which is not necessarily the case with other hardware and/or other
circumstances; please also see the use of the videorate element and/or
http://gentrans.sourceforge.net/docs/head/manual/html/howto.html#sect-recording
for a discussion of a/v sync issues (which is out of scope of avimux here).


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