<div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">if u are trying to play h264 content from mp4 file , u can look for codec data inside setcaps function in ur decoder plugin . have a look at ffmpeg decoder plugin . src </blockquote><div> </div><div>Thankyou for your quick reply. Yes i am trying to play an MP4 file with h264 content. have coded to search for "codec_data" in setcaps function in my decoder as follows: if (gst_structure_has_name (structure, "video/x-h264")) { // has a codec_data if ((value = gst_structure_get_value (structure, "codec_data"))) { GstBuffer *buffer; gint i, len; guint8 *data; guint size, num_sps, num_pps; guint nal_length_size; buffer = gst_value_get_buffer (value); data = GST_BUFFER_DATA (buffer); size = GST_BUFFER_SIZE (buffer); .... .... </div><div> But i am getting NULL in "value" variable i.e. my decoder is unable to find "codec_data" in caps structure. I have checked with qtdemux also, it adds the required "codec_data" to the caps structure. But somehow my code is not able to retrieve the same. Please help me. Thankyou </div><blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"> On Fri, May 4, 2012 at 11:38 AM, Vikas Malhotra <<a href="mailto:ervikaspec@gmail.com">ervikaspec@gmail.com</a>>wrote: > Hello everybody, > > I am trying to write a H264 decoder plugin. My decoder needs SPS NAL Unit > to construct the decoder API. > I am new to GStreamer Source. So, I am not sure how to retrieve SPS NAL > Units in my decoder plugin. > > Please help me solve my problem. > > Thankyou > > -- > > -------------------------------------- > Vikas > Bachelor of Engineering > Computer Science and Engineering > <<a href="http://www.vikaspec.co.cc/" target="_blank">http://www.vikaspec.co.cc/</a>> > > _______________________________________________ > gstreamer-devel mailing list > <a href="mailto:gstreamer-devel@lists.freedesktop.org">gstreamer-devel@lists.freedesktop.org</a> > <a href="http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel" target="_blank">http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a> > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <<a href="http://lists.freedesktop.org/archives/gstreamer-devel/attachments/20120504/be556ab3/attachment-0001.htm" target="_blank">http://lists.freedesktop.org/archives/gstreamer-devel/attachments/20120504/be556ab3/attachment-0001.htm</a>> ------------------------------ Message: 3 Date: Fri, 4 May 2012 08:38:47 +0200 From: Marc Leeman <<a href="mailto:marc.leeman@gmail.com">marc.leeman@gmail.com</a>> Subject: Re: [gmail] Help Needed : H264 SPS Extraction To: Discussion of the development of and with GStreamer <<a href="mailto:gstreamer-devel@lists.freedesktop.org">gstreamer-devel@lists.freedesktop.org</a>> Message-ID: <<a href="mailto:20120504063847.GE2382@scorpius.homelinux.org">20120504063847.GE2382@scorpius.homelinux.org</a>> Content-Type: text/plain; charset="iso-8859-15" > I am new to GStreamer Source. So, I am not sure how to retrieve SPS NAL > Units in my decoder plugin. > > Please help me solve my problem. See: <a href="http://bit.ly/KjiZQV" target="_blank">http://bit.ly/KjiZQV</a> </blockquote><div> </div><div> Thanks for your reply. I have coded the required thing in setcaps to retrieve "codec_data" in my decoder which would provide me with SPS units but somehow my setcaps function is not able to retrieve the "codec_data" in caps structure. Please help. Thankyou </div><blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"> -- greetz, marc harvey 2.6.29.1 #1 PREEMPT Mon Apr 6 22:33:31 CDT 2009 GNU/Linux </blockquote></div>