<HTML><HEAD><TITLE></TITLE> <META content="KsDHTMLEDLib.ocx, FreeWare HTML Editor 1.164.2, ?Kurt Senfer" name=GENERATOR> <META http-equiv=Content-Type content="text/html; charset=GB2312"></HEAD> <BODY style="FONT-SIZE: 8pt; FONT-FAMILY: Tahoma" leftMargin=5 topMargin=5 #ffffff> <DIV>Edward Hervey, Hello </DIV> <DIV> </DIV> <DIV>Thanks Edward and  zhangfei gao. The problem have been solved. Thanks for all your helps! </DIV> <DIV> </DIV> <DIV>jp_liu, <A href="mailto:jp_liu@astrocom.cn">jp_liu@astrocom.cn</A></DIV> <DIV>2007-03-30 </DIV> <BLOCKQUOTE style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style="FONT-WEIGHT: normal; FONT-SIZE: 9pt; LINE-HEIGHT: normal; FONT-STYLE: normal; FONT-VARIANT: normal">----- Receiving the following content ----- </DIV> <DIV style="FONT-WEIGHT: normal; FONT-SIZE: 9pt; BACKGROUND: #e4e4e4; LINE-HEIGHT: normal; FONT-STYLE: normal; FONT-VARIANT: normal; font-color: black">From: <A href="mailto:bilboed@gmail.com">Edward Hervey</A> </DIV> <DIV style="FONT-WEIGHT: normal; FONT-SIZE: 9pt; LINE-HEIGHT: normal; FONT-STYLE: normal; FONT-VARIANT: normal">Receiver: <A href="mailto:jp_liu@astrocom.cn">jp_liu</A> </DIV> <DIV style="FONT-WEIGHT: normal; FONT-SIZE: 9pt; LINE-HEIGHT: normal; FONT-STYLE: normal; FONT-VARIANT: normal">Time: 2007-03-28, 17:44:07</DIV> <DIV style="FONT-WEIGHT: normal; FONT-SIZE: 9pt; LINE-HEIGHT: normal; FONT-STYLE: normal; FONT-VARIANT: normal">Subject: Re:_Re:_Re:_[gst-devel]_Re:_[gst-devel]re：_Re:_how_to_use_qtdemux_to_demux_h264_stream_from_MP4?</DIV> <DIV> </DIV> <DIV></DIV> <DIV></DIV> <DIV> <DIV>Hi,   The qtdemuxer will give you a "codec_data" buffer in the h264 caps. That codec_data is the content of the QuickTime 'avcC' atom. Doing a search on google for "avcC atom sps" will lead you to documents or code describing the contents of that atom, which contains all the information you want.    Edward On 3/23/07, jp_liu <<A href="mailto: jp_liu@astrocom.cn">jp_liu@astrocom.cn</A>> wrote: > > > Edward Hervey, Hello > > Now I clearly understand if I get sps data , pps data and nal_unit_size, I > can covert mp4 file to byte-stream format. > I need to know how to get these informations from qtdemux. > > jp_liu, <A href="mailto: jp_liu@astrocom.cn">jp_liu@astrocom.cn</A> > 2007-03-23 > > ----- Receiving the following content ----- > From: Edward Hervey > Receiver: jp_liu > Time: 2007-03-28, 16:43:17 > Subject: > Re:_Re:_[gst-devel]_Re:_[gst-devel]re：_Re:_how_to_use_qtdemux_to_demux_h264_stream_from_MP4? > > > > > > Hi, > > I forgot to mention that this patch doesn't solve your problem, but > changes some behaviour in qtdemux. The real question was whether it > broke the behaviour of your decoder or not, since with the existing > h264 decoders it doesn't. > > Hoping somebody more knowledgeable about h264 will help solve your > problem, > > Edward > > On 3/28/07, jp_liu <<A href="mailto: jp_liu@astrocom.cn">jp_liu@astrocom.cn</A>> wrote: > > > > > > Edward Hervey, Hello > > > > Thanks for your reply. > > But I think you have misunderstood . > > My problem is my decoder(buy from 3rd party) can not decode the frame > > without sps,pps and nal unit(Bytestream). I must covert the frames to the > > Byte-stream frames, such as add sps pps at first frame , add start code at > > each nal unit.... so your patch can not solve my problem,but anyway, > thanks. > > > > jp_liu, <A href="mailto: jp_liu@astrocom.cn">jp_liu@astrocom.cn</A> > > 2007-03-28 > > > > ----- Receiving the following content ----- > > From: Edward Hervey > > Receiver: jp_liu > > Time: 2007-03-27, 17:18:32 > > Subject: > > > Re:_[gst-devel]_Re:_[gst-devel]re：_Re:_how_to_use_qtdemux_to_demux_h264_stream_from_MP4? > > > > > > > > > > > > Hi, > > > > Could you also try applying the following patch fixing qtdemux so > > that it outputs h264 buffers with pts instead of dts. If you are > > making a software decoder you shouldn't need the dts. > > the patch and explanations are here : > > <A href="http://bugzilla.gnome.org/show_bug.cgi?id=423283">http://bugzilla.gnome.org/show_bug.cgi?id=423283</A> > > > > Edward > > > > On 3/26/07, jp_liu <<A href="mailto: jp_liu@astrocom.cn">jp_liu@astrocom.cn</A>> wrote: > > > > > > > > > zhangfei gao, Hello > > > > > > My h264 decoder support say that: > > > I believe MP4 uses the NAL format (Need to confirm) and hence doesn't > have > > > the NAL Start codes. One needs to convert that to bytstream format > because > > > our decoders support only byte-stream format. Also one needs to do this > > > while demuxing it from MP4 otherwise the information various slice > > positions > > > would be lost. > > > > > > So, How should I do? > > > > > > jp_liu, <A href="mailto: jp_liu@astrocom.cn">jp_liu@astrocom.cn</A> > > > 2007-03-26 > > > > > > ----- Receiving the following content ----- > > > From: zhangfei gao > > > Receiver: gstreamer-devel > > > Time: 2007-03-22, 21:24:01 > > > Subject: [gst-devel]re： Re: how to use qtdemux to demux h264 stream from > > > MP4? > > > > > > > > > > > > > > > > > > > > > hi, jp_liu > > > > > > "h264.c" in ffmpeg has useful information of how to parse "codec_data" > > which > > > get set_caps. > > > "codec_data" has all the nal_length, sps data and pps data. > > > > > > Thanks > > > Jan Schmidt <<A href="mailto: thaytan@noraisin.net">thaytan@noraisin.net</A>> 写道： > > > jp_liu wrote: > > > > Hello, gstreamer-devel > > > > > > > > How to use qtdemux to demux h264 stream from MP4? > > > > The demuxed h264 stream looks have no startcodes before every NAL > > > > Unit. So, Some key information ( such as: SPS PPS ....) is missed. It > > > > caused my H264 decoder can not decode the frame which demuxed by > qtdemux > > . > > > > How can I solve this problem? > > > > > > > > > > I think the information your decoder is looking for is the stuff > > > provided by the 'codec_data' in the caps. This is the header information > > > that quicktime stores and provides separately from the actual data > stream. > > > > > > Regards, > > > Jan. > > > > > > > > > ------------------------------------------------------------------------- > > > Take Surveys. Earn Cash. Influence the Future of IT > > > Join SourceForge.net's Techsay panel and you'll get the chance to share > > your > > > opinions on IT & business topics through brief surveys-and earn cash > > > > > > <A href="http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV_______________________________________________">http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV_______________________________________________</A> > > > gstreamer-devel mailing list > > > <A href="mailto: gstreamer-devel@lists.sourceforge.net">gstreamer-devel@lists.sourceforge.net</A> > > > > > > <A href="https://lists.sourceforge.net/lists/listinfo/gstreamer-devel">https://lists.sourceforge.net/lists/listinfo/gstreamer-devel</A> > > > > > > > > > > > > ________________________________ > > > 抢注雅虎免费邮箱-3.5G容量，20M附件！ > > > > > > > > > > > > ------------------------------------------------------------------------- > > > Take Surveys. Earn Cash. Influence the Future of IT > > > Join SourceForge.net's Techsay panel and you'll get the chance to share > > your > > > opinions on IT & business topics through brief surveys-and earn cash > > > > > > <A href="http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV">http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV</A> > > > _______________________________________________ > > > gstreamer-devel mailing list > > > <A href="mailto: gstreamer-devel@lists.sourceforge.net">gstreamer-devel@lists.sourceforge.net</A> > > > > > > <A href="https://lists.sourceforge.net/lists/listinfo/gstreamer-devel">https://lists.sourceforge.net/lists/listinfo/gstreamer-devel</A> > > > > > > > > > > > > -- > > Edward Hervey > > Multimedia editing developer / Fluendo S.A. > > <A href="http://www.pitivi.org/">http://www.pitivi.org/</A> > > > > > -- > Edward Hervey > Multimedia editing developer / Fluendo S.A. > <A href="http://www.pitivi.org/">http://www.pitivi.org/</A> > -- Edward Hervey Multimedia editing developer / Fluendo S.A. <A href="http://www.pitivi.org/">http://www.pitivi.org/</A> </DIV></DIV></BLOCKQUOTE></BODY></HTML>