Synchronising audio and video in gnonlin

[Rossana Guerra]

I don't know how your pipeline is, but when I did crossfading I achieved
this by the caps properties. Even it fits for 2 video files I think the
principle is the same.
Here's the thread:

http://gstreamer-devel.966125.n4.nabble.com/crossfading-audio-error-gst-mad-chain-mad-header-decode-had-an-error-lost-synchronization-td4037851.html#a4037881

Basically I did 2 gnlcomposition, one for audio and another for video.
Sorry I don't have the pipeline in this computer.
But it was something like this.

http://gstreamer-devel.966125.n4.nabble.com/No-sound-in-my-pipeline-td3854506.html

Hope it helps.
Rossana

2012/1/17 Ralph <ralph.gucwa at racelogic.co.uk>

> I'm using gnonlin to play a sequence of video file fragments. I
> constructed a
> pipeline containing two gnlcomposition objects - one for video and the
> other
> for audio, they are playing the same video files. In order to be able to
> have gaps between the files, I created videotestsrc and audiotestsrc and
> added them through gnlsources (priority: uint.MaxValue) to gnlcomposition
> objects.
>
> My "timeline" looks like this:
> 659.24s file, start position 2s (2s gap before the file)
> 881.04s file, start position 661.24s (4s gap before the file)
>
> When I disable the audio part, the video works nicely - the file fragments
> are played exactly when scheduled and the gaps between them are precisely
> the required length.  Perfect!  The problems occur when I enable the audio
> section - the gaps become much shorter, strange things start to happen.
>
> When I try to play both video and audio, the first file begins after just
> 0.4s, and when it ends, the video skips the second gap and jumps many
> seconds into the second file and the video remains frozen, it waits for the
> audio (which is playing nicely except for the 1.6 second shorter gap) to
> that position and then continues.
> What's interesting the length of the initial gap is always 1.6 seconds
> shorter than it should be - when the gap should be 20s, it is played within
> 18.4 seconds.  The second gap is always completely wrong.
> It's not the problem with the video, if I disable the video section, the
> audio is wrong, the gaps are shorter than scheduled.
> What's wrong with my pipeline?
>
> My video files are:
> video: Xvid ISO MPEG-4 720x576 25fps
> audio: MPEG-1 Layer 2 48kHz 192kb/s stereo
>
> The audio gnlcomposition runs at 48kHz, the audio is then converted using
> audioconvert.
> The audiotestsrc runs at 44.1kHz.
> The autoaudiosink runs at 44.1kHz.
>
>
> --
> View this message in context:
> http://gstreamer-devel.966125.n4.nabble.com/Synchronising-audio-and-video-in-gnonlin-tp4303968p4303968.html
> Sent from the GStreamer-devel mailing list archive at Nabble.com.
> _______________________________________________
> gstreamer-devel mailing list
> gstreamer-devel at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/gstreamer-devel/attachments/20120117/9fbe9d3b/attachment.html>