Decodebin and decoders for parsed streams

[Andoni Morales]

2013/8/10 Alexey Chernov <4ernov at gmail.com>

> Hello,
>
> I'm developing a GStreamer wrapper element on top of hardware decoder API
> using GstVideoDecoder as a base class. It can decode H.264 streams in byte-
> stream format (a.k.a. annex-B) only and provides raw frames in UYVY
> format. I
> found very convenient to use h264parse to parse any H.264 input stream and
> get
> preferred stream format from e.g. AVC. Everything seems to work fine, but
> when
> I try to make decodebin pick my decoder automatically, I see "You
> installation
> missing a plugin" message reporting that there's no H.264 decoder. I tried
> to
> set my plugin rank to GST_RANK_PRIMARY + 1 and the sink and src templates
> are
> the following:
>

In your elements details, are you setting klass="Codec/Decoder/Video"? In
the output if gst-inspect, you should have something like:

Factory Details:
  Long name:    FFmpeg H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 decoder
  Class:    Codec/Decoder/Video


Cheers,
Andoni


> static GstStaticPadTemplate gst_litevmetadec_sink_template =
> GST_STATIC_PAD_TEMPLATE ("sink",
> GST_PAD_SINK,
> GST_PAD_ALWAYS,
> GST_STATIC_CAPS ("video/x-h264,"
> "parsed = (boolean) true, stream-format = (string) byte-stream")
> );
>
> static GstStaticPadTemplate gst_litevmetadec_src_template =
> GST_STATIC_PAD_TEMPLATE ("src",
> GST_PAD_SRC,
> GST_PAD_ALWAYS,
> GST_STATIC_CAPS ("video/x-raw,"
> "format = (string) UYVY")
> );
>
> Do I need to add something so that decodebin picked my decoder and also
> inserted h264parse before it if necessary? Obviously, I'm missing
> something,
> as I tried to set sink template the same as avdec_h264 has, but the result
> was
> quite the same.
>
> Best regards,
> Alexey Chernov
> _______________________________________________
> gstreamer-devel mailing list
> gstreamer-devel at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>



-- 
Andoni Morales Alastruey

LongoMatch:The Digital Coach
http://www.longomatch.ylatuya.es
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