QT Demux with strange ouput ES data
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QT Demux with strange ouput ES data
 
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Hi,
I am trying to use the qtdemux to demux a ".mov" file that I have. I am using the qtdemux and then I put the output into my onboard decoder. However it is failing to find start codes in the data. I checked by running qtdemux on my PC (FC10) by running the following: gst-launch filesrc location=term.mov ! qtdemux name=demux demux.audio_00 ! queue ! fakesink demux.video_00 ! queue ! filesink location=gstreamer.h264 I then try to use mplayer to play the output file of gstreamer.h264 and it too fails to find any video start codes. If I compare the output of qtdemux to that of a reference demux that we already have I notice the following: 1.) I do not get a 'DSI header' at start of stream which helps to set up decoders. This is not a major issue and I am sure can be resolved. 2.) The Data is almost identical except that the reference demux has a start code of 80 00 00 01 followed by the data. However the qtdemux is giving me 80 00 00 00 XX where XX is random this is followed by idential data as the reference demux. Without the magic header of 80 00 00 01 our decoder fails to see start codes and therefore bombs out. I was wondering if anyone might be able to point me to why this happens (spec revision?) As I need to understand this rather subtle but important issue. With regards, Daniel Laird ------------------------------------------------------------------------------ Create and Deploy Rich Internet Apps outside the browser with Adobe(R)AIR(TM) software. With Adobe AIR, Ajax developers can use existing skills and code to build responsive, highly engaging applications that combine the power of local resources and data with the reach of the web. Download the Adobe AIR SDK and Ajax docs to start building applications today-http://p.sf.net/sfu/adobe-com _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
Re: QT Demux with strange ouput ES data
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On Tue, Feb 10, 2009 at 2:58 AM, Daniel James Laird
<[hidden email]> wrote: > Hi, > > I am trying to use the qtdemux to demux a ".mov" file that I have. I am using the qtdemux and then I put the output into my onboard decoder. However it is failing to find start codes in the data. > I checked by running qtdemux on my PC (FC10) by running the following: > gst-launch filesrc location=term.mov ! qtdemux name=demux demux.audio_00 ! queue ! fakesink demux.video_00 ! queue ! filesink location=gstreamer.h264 > qtdemux doesn't output an H.264 elementary stream, which is where you're having problems. Additional headers needed to initialise your decoder will be in the "codec_info" attribute in the caps. Depending on how your decoder is structured, perhaps you can supply this directly, or perhaps you need to rewrite the stream using that data to be a raw elementary stream. Mike ------------------------------------------------------------------------------ Create and Deploy Rich Internet Apps outside the browser with Adobe(R)AIR(TM) software. With Adobe AIR, Ajax developers can use existing skills and code to build responsive, highly engaging applications that combine the power of local resources and data with the reach of the web. Download the Adobe AIR SDK and Ajax docs to start building applications today-http://p.sf.net/sfu/adobe-com _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
Re: QT Demux with strange ouput ES data
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Thanks for the feedback, Any ideas as to why the qtdemux does not output Elementary Streams? The mpegdemux does as does the AVI demux and the mkv demux.
On a similar note I am trying to get asfdemux to do something useful. I cannot get this to output to a file that plays back either. Does this not output ES either? Cheers Dan -----Original Message----- From: Michael Smith [mailto:[hidden email]] Sent: 2009 Feb 10 16:50 To: Discussion of the development of GStreamer Subject: Re: [gst-devel] QT Demux with strange ouput ES data On Tue, Feb 10, 2009 at 2:58 AM, Daniel James Laird <[hidden email]> wrote: > Hi, > > I am trying to use the qtdemux to demux a ".mov" file that I have. I am using the qtdemux and then I put the output into my onboard decoder. However it is failing to find start codes in the data. > I checked by running qtdemux on my PC (FC10) by running the following: > gst-launch filesrc location=term.mov ! qtdemux name=demux demux.audio_00 ! queue ! fakesink demux.video_00 ! queue ! filesink location=gstreamer.h264 > qtdemux doesn't output an H.264 elementary stream, which is where you're having problems. Additional headers needed to initialise your decoder will be in the "codec_info" attribute in the caps. Depending on how your decoder is structured, perhaps you can supply this directly, or perhaps you need to rewrite the stream using that data to be a raw elementary stream. Mike ------------------------------------------------------------------------------ Create and Deploy Rich Internet Apps outside the browser with Adobe(R)AIR(TM) software. With Adobe AIR, Ajax developers can use existing skills and code to build responsive, highly engaging applications that combine the power of local resources and data with the reach of the web. Download the Adobe AIR SDK and Ajax docs to start building applications today-http://p.sf.net/sfu/adobe-com _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel ------------------------------------------------------------------------------ Create and Deploy Rich Internet Apps outside the browser with Adobe(R)AIR(TM) software. With Adobe AIR, Ajax developers can use existing skills and code to build responsive, highly engaging applications that combine the power of local resources and data with the reach of the web. Download the Adobe AIR SDK and Ajax docs to start building applications today-http://p.sf.net/sfu/adobe-com _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
Re: QT Demux with strange ouput ES data
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In reply to this post by michael smith-6-3
How do I get this codec_info header from a downstream component (i.e how can my sink get this info)?
I have tried searching for it in the code (an manual) and have failed horribly. I suspect that I am doing something rather stupid but I cannot find an example usage at all. Hope you can help Dan -----Original Message----- From: Michael Smith [mailto:[hidden email]] Sent: 2009 Feb 10 16:50 To: Discussion of the development of GStreamer Subject: Re: [gst-devel] QT Demux with strange ouput ES data On Tue, Feb 10, 2009 at 2:58 AM, Daniel James Laird <[hidden email]> wrote: > Hi, > > I am trying to use the qtdemux to demux a ".mov" file that I have. I am using the qtdemux and then I put the output into my onboard decoder. However it is failing to find start codes in the data. > I checked by running qtdemux on my PC (FC10) by running the following: > gst-launch filesrc location=term.mov ! qtdemux name=demux demux.audio_00 ! queue ! fakesink demux.video_00 ! queue ! filesink location=gstreamer.h264 > qtdemux doesn't output an H.264 elementary stream, which is where you're having problems. Additional headers needed to initialise your decoder will be in the "codec_info" attribute in the caps. Depending on how your decoder is structured, perhaps you can supply this directly, or perhaps you need to rewrite the stream using that data to be a raw elementary stream. Mike ------------------------------------------------------------------------------ Create and Deploy Rich Internet Apps outside the browser with Adobe(R)AIR(TM) software. With Adobe AIR, Ajax developers can use existing skills and code to build responsive, highly engaging applications that combine the power of local resources and data with the reach of the web. Download the Adobe AIR SDK and Ajax docs to start building applications today-http://p.sf.net/sfu/adobe-com _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel ------------------------------------------------------------------------------ Create and Deploy Rich Internet Apps outside the browser with Adobe(R)AIR(TM) software. With Adobe AIR, Ajax developers can use existing skills and code to build responsive, highly engaging applications that combine the power of local resources and data with the reach of the web. Download the Adobe AIR SDK and Ajax docs to start building applications today-http://p.sf.net/sfu/adobe-com _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
Re: QT Demux with strange ouput ES data
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On Thu, Feb 12, 2009 at 10:48 AM, Daniel James Laird <[hidden email]> wrote: How do I get this codec_info header from a downstream component (i.e how can my sink get this info)? It's likely to be in the caps of the stream. If you run your gst-launch in verbose mode (-v) you'll probably see them.
-- Thiago Sousa Santos Embedded Systems and Pervasive Computing Lab (Embedded) Center of Electrical Engineering and Informatics (CEEI) Federal University of Campina Grande (UFCG) ------------------------------------------------------------------------------ Create and Deploy Rich Internet Apps outside the browser with Adobe(R)AIR(TM) software. With Adobe AIR, Ajax developers can use existing skills and code to build responsive, highly engaging applications that combine the power of local resources and data with the reach of the web. Download the Adobe AIR SDK and Ajax docs to start building applications today-http://p.sf.net/sfu/adobe-com _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
Re: QT Demux with strange ouput ES data
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In reply to this post by Daniel Laird
Daniel James Laird schrieb:
> Thanks for the feedback, Any ideas as to why the qtdemux does not output Elementary Streams? The mpegdemux does as does the AVI demux and the mkv demux. Its a design decission of the format. Stefan > > On a similar note I am trying to get asfdemux to do something useful. I cannot get this to output to a file that plays back either. Does this not output ES either? > > Cheers > Dan > > -----Original Message----- > From: Michael Smith [mailto:[hidden email]] > Sent: 2009 Feb 10 16:50 > To: Discussion of the development of GStreamer > Subject: Re: [gst-devel] QT Demux with strange ouput ES data > > On Tue, Feb 10, 2009 at 2:58 AM, Daniel James Laird > <[hidden email]> wrote: >> Hi, >> >> I am trying to use the qtdemux to demux a ".mov" file that I have. I am using the qtdemux and then I put the output into my onboard decoder. However it is failing to find start codes in the data. >> I checked by running qtdemux on my PC (FC10) by running the following: >> gst-launch filesrc location=term.mov ! qtdemux name=demux demux.audio_00 ! queue ! fakesink demux.video_00 ! queue ! filesink location=gstreamer.h264 >> > > qtdemux doesn't output an H.264 elementary stream, which is where > you're having problems. > > Additional headers needed to initialise your decoder will be in the > "codec_info" attribute in the caps. Depending on how your decoder is > structured, perhaps you can supply this directly, or perhaps you need > to rewrite the stream using that data to be a raw elementary stream. > > Mike > > ------------------------------------------------------------------------------ > Create and Deploy Rich Internet Apps outside the browser with Adobe(R)AIR(TM) > software. With Adobe AIR, Ajax developers can use existing skills and code to > build responsive, highly engaging applications that combine the power of local > resources and data with the reach of the web. Download the Adobe AIR SDK and > Ajax docs to start building applications today-http://p.sf.net/sfu/adobe-com > _______________________________________________ > gstreamer-devel mailing list > [hidden email] > https://lists.sourceforge.net/lists/listinfo/gstreamer-devel > > ------------------------------------------------------------------------------ > Create and Deploy Rich Internet Apps outside the browser with Adobe(R)AIR(TM) > software. With Adobe AIR, Ajax developers can use existing skills and code to > build responsive, highly engaging applications that combine the power of local > resources and data with the reach of the web. Download the Adobe AIR SDK and > Ajax docs to start building applications today-http://p.sf.net/sfu/adobe-com > _______________________________________________ > gstreamer-devel mailing list > [hidden email] > https://lists.sourceforge.net/lists/listinfo/gstreamer-devel ------------------------------------------------------------------------------ Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA -OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise -Strategies to boost innovation and cut costs with open source participation -Receive a $600 discount off the registration fee with the source code: SFAD http://p.sf.net/sfu/XcvMzF8H _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
Re: QT Demux with strange ouput ES data
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Just coming back to this again, I am confused as to why you think it is a feature of the format.
I have a MP4/MOV demux currently that outputs ES data when it does the demux (Not gstreamer or linux based). And I was generally of the opinion that demuxes should output ES data streams (its their primary purpose). I am interested in whether this feature of the qtdemux is because of 1.) implementation choices (implemented like this for good reasons (which are?)) 2.) A hard feature of MOV/MP4 files (unlikely as my current demux seems to output ES with no worries) Maybe I can write another convertor plugin that takes this proprietry output and converts to ES. (maybe one already exists?). Maybe I could look into changing qtdemux to output ES data streams instead? What would be the conseqences of this? Would this be accepted back into gstreamer if I went down this route? Currently our onboard video decoder works really well with the demux formats that output ES (mkv, avi, mpegdemux) but the qtdemux is a gaping hole and would really like to get this to work as well. Many thanks for the time Daniel Laird -----Original Message----- From: Stefan Kost [mailto:[hidden email]] Sent: 2009 Feb 13 11:15 To: Discussion of the development of GStreamer Subject: Re: [gst-devel] QT Demux with strange ouput ES data Daniel James Laird schrieb: > Thanks for the feedback, Any ideas as to why the qtdemux does not output Elementary Streams? The mpegdemux does as does the AVI demux and the mkv demux. Its a design decission of the format. Stefan > > On a similar note I am trying to get asfdemux to do something useful. I cannot get this to output to a file that plays back either. Does this not output ES either? > > Cheers > Dan > > -----Original Message----- > From: Michael Smith [mailto:[hidden email]] > Sent: 2009 Feb 10 16:50 > To: Discussion of the development of GStreamer > Subject: Re: [gst-devel] QT Demux with strange ouput ES data > > On Tue, Feb 10, 2009 at 2:58 AM, Daniel James Laird > <[hidden email]> wrote: >> Hi, >> >> I am trying to use the qtdemux to demux a ".mov" file that I have. I am using the qtdemux and then I put the output into my onboard decoder. However it is failing to find start codes in the data. >> I checked by running qtdemux on my PC (FC10) by running the following: >> gst-launch filesrc location=term.mov ! qtdemux name=demux demux.audio_00 ! queue ! fakesink demux.video_00 ! queue ! filesink location=gstreamer.h264 >> > > qtdemux doesn't output an H.264 elementary stream, which is where > you're having problems. > > Additional headers needed to initialise your decoder will be in the > "codec_info" attribute in the caps. Depending on how your decoder is > structured, perhaps you can supply this directly, or perhaps you need > to rewrite the stream using that data to be a raw elementary stream. > > Mike > > ------------------------------------------------------------------------------ > Create and Deploy Rich Internet Apps outside the browser with Adobe(R)AIR(TM) > software. With Adobe AIR, Ajax developers can use existing skills and code to > build responsive, highly engaging applications that combine the power of local > resources and data with the reach of the web. Download the Adobe AIR SDK and > Ajax docs to start building applications today-http://p.sf.net/sfu/adobe-com > _______________________________________________ > gstreamer-devel mailing list > [hidden email] > https://lists.sourceforge.net/lists/listinfo/gstreamer-devel > > ------------------------------------------------------------------------------ > Create and Deploy Rich Internet Apps outside the browser with Adobe(R)AIR(TM) > software. With Adobe AIR, Ajax developers can use existing skills and code to > build responsive, highly engaging applications that combine the power of local > resources and data with the reach of the web. Download the Adobe AIR SDK and > Ajax docs to start building applications today-http://p.sf.net/sfu/adobe-com > _______________________________________________ > gstreamer-devel mailing list > [hidden email] > https://lists.sourceforge.net/lists/listinfo/gstreamer-devel ------------------------------------------------------------------------------ Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA -OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise -Strategies to boost innovation and cut costs with open source participation -Receive a $600 discount off the registration fee with the source code: SFAD http://p.sf.net/sfu/XcvMzF8H _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel ------------------------------------------------------------------------------ Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA -OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise -Strategies to boost innovation and cut costs with open source participation -Receive a $600 discount off the registration fee with the source code: SFAD http://p.sf.net/sfu/XcvMzF8H _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
Re: QT Demux with strange ouput ES data
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On Thu, 2009-02-26 at 12:26 +0100, Daniel James Laird wrote:
> Just coming back to this again, I am confused as to why you think it is a feature of the format. > I have a MP4/MOV demux currently that outputs ES data when it does the demux (Not gstreamer or linux based). And I was generally of the opinion that demuxes should output ES data streams (its their primary purpose). > > I am interested in whether this feature of the qtdemux is because of > 1.) implementation choices (implemented like this for good reasons (which are?)) > 2.) A hard feature of MOV/MP4 files (unlikely as my current demux seems to output ES with no worries) The elementary stream format is much less efficient to store h264 data in. A typical decoder needs to scan for startcodes in the elementary stream while the quicktime format prefixes the length before the NAL packets. There is also a config string that describes SPS/PPS and the length of the NAL length prefix. A typical decoder should handle both formats, the config string in the caps triggers the ES or NAL length prefixed format. We prefer to not mess up the native formats of demuxers too much as it requires more resources than needed. You can write a convertor of course but really the quicktime format is trivally and efficiently converted to a bytestream (which is rather silly thing to do because it would make parsing the NAL units slow again). Wim > Maybe I can write another convertor plugin that takes this proprietry output and converts to ES. (maybe one already exists?). > > Maybe I could look into changing qtdemux to output ES data streams instead? > What would be the conseqences of this? Would this be accepted back into gstreamer if I went down this route? > > Currently our onboard video decoder works really well with the demux formats that output ES (mkv, avi, mpegdemux) but the qtdemux is a gaping hole and would really like to get this to work as well. > > Many thanks for the time > Daniel Laird > > -----Original Message----- > From: Stefan Kost [mailto:[hidden email]] > Sent: 2009 Feb 13 11:15 > To: Discussion of the development of GStreamer > Subject: Re: [gst-devel] QT Demux with strange ouput ES data > > Daniel James Laird schrieb: > > Thanks for the feedback, Any ideas as to why the qtdemux does not output Elementary Streams? The mpegdemux does as does the AVI demux and the mkv demux. > > Its a design decission of the format. > > Stefan > > > > On a similar note I am trying to get asfdemux to do something useful. I cannot get this to output to a file that plays back either. Does this not output ES either? > > > > Cheers > > Dan > > > > -----Original Message----- > > From: Michael Smith [mailto:[hidden email]] > > Sent: 2009 Feb 10 16:50 > > To: Discussion of the development of GStreamer > > Subject: Re: [gst-devel] QT Demux with strange ouput ES data > > > > On Tue, Feb 10, 2009 at 2:58 AM, Daniel James Laird > > <[hidden email]> wrote: > >> Hi, > >> > >> I am trying to use the qtdemux to demux a ".mov" file that I have. I am using the qtdemux and then I put the output into my onboard decoder. However it is failing to find start codes in the data. > >> I checked by running qtdemux on my PC (FC10) by running the following: > >> gst-launch filesrc location=term.mov ! qtdemux name=demux demux.audio_00 ! queue ! fakesink demux.video_00 ! queue ! filesink location=gstreamer.h264 > >> > > > > qtdemux doesn't output an H.264 elementary stream, which is where > > you're having problems. > > > > Additional headers needed to initialise your decoder will be in the > > "codec_info" attribute in the caps. Depending on how your decoder is > > structured, perhaps you can supply this directly, or perhaps you need > > to rewrite the stream using that data to be a raw elementary stream. > > > > Mike > > > > ------------------------------------------------------------------------------ > > Create and Deploy Rich Internet Apps outside the browser with Adobe(R)AIR(TM) > > software. With Adobe AIR, Ajax developers can use existing skills and code to > > build responsive, highly engaging applications that combine the power of local > > resources and data with the reach of the web. Download the Adobe AIR SDK and > > Ajax docs to start building applications today-http://p.sf.net/sfu/adobe-com > > _______________________________________________ > > gstreamer-devel mailing list > > [hidden email] > > https://lists.sourceforge.net/lists/listinfo/gstreamer-devel > > > > ------------------------------------------------------------------------------ > > Create and Deploy Rich Internet Apps outside the browser with Adobe(R)AIR(TM) > > software. With Adobe AIR, Ajax developers can use existing skills and code to > > build responsive, highly engaging applications that combine the power of local > > resources and data with the reach of the web. Download the Adobe AIR SDK and > > Ajax docs to start building applications today-http://p.sf.net/sfu/adobe-com > > _______________________________________________ > > gstreamer-devel mailing list > > [hidden email] > > https://lists.sourceforge.net/lists/listinfo/gstreamer-devel > > > ------------------------------------------------------------------------------ > Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA > -OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise > -Strategies to boost innovation and cut costs with open source participation > -Receive a $600 discount off the registration fee with the source code: SFAD > http://p.sf.net/sfu/XcvMzF8H > _______________________________________________ > gstreamer-devel mailing list > [hidden email] > https://lists.sourceforge.net/lists/listinfo/gstreamer-devel > > ------------------------------------------------------------------------------ > Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA > -OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise > -Strategies to boost innovation and cut costs with open source participation > -Receive a $600 discount off the registration fee with the source code: SFAD > http://p.sf.net/sfu/XcvMzF8H > _______________________________________________ > gstreamer-devel mailing list > [hidden email] > https://lists.sourceforge.net/lists/listinfo/gstreamer-devel ------------------------------------------------------------------------------ Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA -OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise -Strategies to boost innovation and cut costs with open source participation -Receive a $600 discount off the registration fee with the source code: SFAD http://p.sf.net/sfu/XcvMzF8H _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
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