[Bug 737396] decodebin doesn't limit src caps on parsers

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=737396
  GStreamer | gst-plugins-base | git

--- Comment #2 from Matej Knopp <matej.knopp at gmail.com> 2014-09-26 17:33:51 UTC ---
So, the magic is there but it doesn't really seem to work :)

1.aacparse doesn't have Converter in metadata, so decodebin doesn't execute the
is_parser_converter branch

2. even when is_parser_converter branch is executed, the following code in
decodebin

    /* Append the parser caps to prevent any not-negotiated errors */
    filter_caps = gst_caps_merge (filter_caps, gst_caps_ref (caps));

just merges the filtered caps with parser original srcpad caps, so it ends up
where it was at the beginning. perhaps it should be in "else" block?

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