[gstreamer-bugs] [Bug 578934] New: v4l2src & ffmpeg cannot negociate format

GStreamer (bugzilla.gnome.org) bugzilla-daemon at bugzilla.gnome.org
Tue Apr 14 07:52:39 PDT 2009

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  GStreamer | gst-plugins-good | Ver: 0.10.21
           Summary: v4l2src & ffmpeg cannot negociate format
           Product: GStreamer
           Version: 0.10.21
          Platform: Other
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: francois.forest at lri.fr
         QAContact: gstreamer-bugs at lists.sourceforge.net
     GNOME version: Unspecified
   GNOME milestone: Unspecified

The following pipeline failed in negociating caps while it exists compatible
caps on each element pairs.
$ gst-launch-0.10  v4l2src ! ffmpegcolorspace ! video/x-raw-rgb ! xvimagesink
ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Could not
negotiate format
Additional debug info:
gstbasesrc.c(2426): gst_base_src_start ():
Check your filtered caps, if any

Hint: the same pipeline ending with element ximagesink or fakesink in place of
xvimagesink succeeds.
The same is true if we force fully defined caps between ffmpeg & ximagesink as
$ gst-launch-0.10 --gst-debug=v4l2src:3 v4l2src ! ffmpegcolorspace !
! xvimagesink

Note: this report is an improved version of bugId 578500 which was set to

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