[gst-devel] QT Demux with strange ouput ES data

[Daniel James Laird]

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:ensonic at hora-obscura.de] 
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:msmith at xiph.org] 
> 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
> <daniel.j.laird at nxp.com> 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
> 
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