[gst-devel] Icecast a dv stream via ogg

[Edward Hervey]

On Tue, 2010-05-11 at 16:15 +0800, matheist76 at westnet.com.au wrote:
> Hi Edward,
> I've done what you have suggested and replaced dvdec with ffdec_dvvideo. I've also added in a queue between the source and the demuxer. It produces much the same thing except with a lower cpu usage. 
> 
> I'm using gstreamer version 0.10.1 . I think the real problem is with the theora encoding. Are there any other plugins that will do the same job?

  0.10.1 ? Seriously ? That's... 5 years old almost. Switch to a recent
(i.e >= 0.10.25) gstreamer and plugins. That's most likely the source of
all your issues.

   Edward

> 
> Matt
> 
> ----- Original Message -----
> From: "Edward Hervey" <bilboed at gmail.com>
> To: "Discussion of the development of GStreamer" <gstreamer-devel at lists.sourceforge.net>
> Sent: Tuesday, 11 May, 2010 4:59:25 PM GMT +10:00 Brisbane
> Subject: Re: [gst-devel] Icecast a dv stream via ogg
> 
> Hi,
> 
> On Tue, 2010-05-11 at 14:27 +0800, matheist76 at westnet.com.au wrote:
> > Hi, I'm wondering if anyone can help me. I want to, using gst-launch,
> > send a dv (firewire) stream from a video camera convert it to an ogg
> > and then send it to an icecast server.
> > 
> > I have tried several things. The main problem seems to lie with
> > converting the dv video stream into a theora stream. 
> > 
> > So I ran some tests. These I ran on an Macbook Pro with an Intel Dual
> > core 2.4GHz Processor and 4GB of ram and my old Toshiba Dual Core
> > 1.8GHz processor and 512MB of ram
> > 
> > So the tests were:
> > 
> > 1.  Just test the decoding of the dv stream. 
> > gst-launch-0.10 dv1394src ! dvdemux ! dvdec ! fakesink
> 
>   Try again with a queue between the source and the demuxer. Here only
> one thread is being used to:
>   * wait for the next frame from the camera
>   * demux it
>   * decode it
> 
>   Also, replace dvdec by ffdec_dvvideo (it's faster)
> > 
> > Mac: gives me 50% and 4% CPU usage. video quality unknown
> > Tosh: same 
> > 
> > 2.  Do the full conversion.
> > gst-launch-0.10 dv1394src ! dvdemux ! dvdec ! video/x-raw-yuv !
> > ffmpegcolorspace ! theoraenc ! oggmux name=mux ! filesink
> > location=test.ogg
> 
>   Same as above, you're having it do *everything* in one thread
> (capturing/demuxing/decoding/colorspace
> conversion/encoding/muxing/writing). Regardless of having multiple
> cores, you want to have a dedicated thread for:
>   * capturing
>   * decoding
>   * encoding
> 
>   Replace dvdec by ffdec_dvvideo (provided with gst-ffmpeg), and you
> don't need to specify you want video/x-raw-yuv (dv decodes to YUV and
> theoraenc accepts YUV). I'm not even certain you need ffmpegcolorspace,
> but let's leave it (won't take any cpu if it doesn't have to transform).
> 
>   This pipeline should do it:
>   dv1394src ! queue ! dvdemux ! dvdec ! queue ! ffmpegcolorspace !
> theoraenc ! queue ! oggmux ! filesink
> > 
> > Mac: That gives me 100% and 4% usage and real crap video.
> > Tosh: Same :-(
> > 
> > I have tried various other things like used queues and set the dv
> > stream to drop frame rates however it ends up that it kinda works but
> > the file plays for only 7 secs when I've recorded 30 secs worth or it
> > records the video for the right length but misses showing most of the
> > frames.
> 
>   Try again with the advices above, if the output is still garbled, then
> there's definitely a problem
> 
>   Also mention what version of gstreamer+plugins you're using
> 
> 
>    Edward
> 
> > 
> > Matthew Franklin.
> > 
> > 
> > ------------------------------------------------------------------------------
> > 
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> > gstreamer-devel at lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
> 
> 
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