[Bug 784372] New: videorate: MVC encoding by encodebin

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=784372

            Bug ID: 784372
           Summary: videorate: MVC encoding by encodebin
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: zzoon at igalia.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Recently I've worked for MVC encoding using vaapi.
Basically it's been successful with static pipeline, but I found one issue when
I test with encodebin.

My test pipeline is as the following:

> gst-launch-1.0 gltestsrc ! glviewconvert input-mode-override=mono output-mode-override=frame-by-frame ! glcolorconvert ! gldownload ! encodebin profile="video/mpegts, systemstream=true, packetsize=188:video/x-h264" ! filesink location=mvc_va.ts

I thought it's working fine but I realized it's not.
That is videorate drops one of two frames every time by comparing timestamp of
each buffer, which is what videorate should be doing normally.

So I'm asking this question.
Do we need to implement something in videorate to support multiview-mode,
especially for frame-by-frame?
Or is there another solution for doing this?

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