[Bug 748635] New: caps negotiation regression

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=748635

            Bug ID: 748635
           Summary: caps negotiation regression
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: lists at svrinformatica.it
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 302564
  --> https://bugzilla.gnome.org/attachment.cgi?id=302564&action=edit
file that show the issue

please try this pipeline with the attached file:

gst-launch-1.0 -v filesrc location=/tmp/test.mkv ! matroskademux ! videorate !
image/jpeg,framerate=3/1 ! jpegdec ! videoscale ! videoconvert !
video/x-raw,width=320,pixel-aspect-ratio=1/1 ! xvimagesink

it works with 1.4 but not with git master

a workaround is to use something like this:

gst-launch-1.0 -v filesrc location=/tmp/test.mkv ! matroskademux ! jpegdec !
videorate ! videoscale ! videoconvert !
video/x-raw,width=320,pixel-aspect-ratio=1/1,framerate=3/1 ! xvimagesink

but this way you'll decode all input frames while with the previous method only
3 fps are decoded

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