[gst-devel] How to keep multiple input sources in sync?

[Stefan Kost]

Am 06.01.2010 15:42, schrieb Francis Rammeloo:
> I have a pipeline that combines three incoming streams (webcam, desktop
> capture, and a logo) into one movie using the videomixer plugin. I
> created the pipeline in text and load it into my program with
> gst_parse_launch. The pipeline description looks like this:
> 
> 
>       desktop. ! queue   
>                ! ffmpegcolorspace
>                ! videoscale
>                ! video/x-raw-yuv,width=640,height=400
>                ! videobox right=-320
>                ! ffmpegcolorspace
>                ! vmix.sink_0
>       webcam. ! queue
>               ! ffmpegcolorspace
>               ! videoscale
>               ! video/x-raw-yuv,width=320,height=240
>               ! vmix.sink_1
>       logo. ! queue
>             ! jpegdec
>             ! ffmpegcolorspace
>             ! videoscale
>             ! video/x-raw-yuv,width=320,height=160
>             ! vmix.sink_2
>       vmix. ! queue 
>             ! ffmpegcolorspace
>             ! dshowvideosink
>       dx9screencapsrc name="desktop"
>       ksvideosrc device-name="Built-in iSight" name="webcam"
>       multifilesrc name="logo" location="chrome/skin/ivpv.jpg"
>       videomixer name=vmix
>                  sink_0::xpos=0 sink_0::ypos=0 sink_0::zorder=0
>                  sink_1::xpos=640 sink_1::ypos=0 sink_1::zorder=1
>                  sink_2::xpos=640 sink_2::ypos=240 sink_2::zorder=2
> 
> The pipeline is playable, but the webcam is terribly out of sync. The
> desktop capture is fine. If I leave out the desktop capture element and
> only combine the webcam and the logo image then it's also fine. It seems
> that only the combination of the desktop and webcam capture is problematic.
> 
> Any idea on how I should fix this?


Can you try adding capsfilters to each videobranch before the videomixer and set
a common framerate there. This might require the use of videorate infront of the
capsfilters.

stefan

> 
> Francis
> 
> 
> 
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