[gst-devel] Firewire cameras with DirectShow

Phil Rendell philrendell at gmail.com
Thu Jun 25 17:46:09 CEST 2009

Thanks. That explains why the two plugins can't speak to each other. I do
have ffdec_dvvideo, but I can't get gst-launch-0.10 dshowvideosrc ! fakesink
to work as this causes gst-launch to crash, again without anything useful
being outputted on the command line, even with the -v option. If I recreate
the pipeline in my application I get an integer division by zero exception
sometime during the call to gst_element_link_many.

I know that dshowvideosrc can find the camera because when I set the
device-name property to be the wrong camera name the pipeline falls through
without an exception being thrown. I've had a look at the other properties I
could set on dshowvideosrc, but can't see anything that jumps out at me that
I should configure.

Is there anything else that you can think of that I could do?


2009/6/25 Julien Isorce <julien.isorce at gmail.com>

> 2009/6/25 Phil Rendell <philrendell at gmail.com>
>> There is only one filter under the Video Capture Sources group: the
>> Microsoft DV Camera and VCR. There are two output pins: DV A/V Out and DV
>> Vid Out. All of the properties in DV A/V Out are disabled and are either
>> empty or set to 'None', with the exception of the color space/compression
>> (which is probably the one we're interested in) which is set to dvsd.
>> The properties for DV Vid Out are the same as above, but without the color
>> space/compression set.
> Then I think gst-launch-0.10 dshowvideosrc ! fakesink can play (I should
> ask you first) because dvsd is ok with the current implementation.
> But in this case I can see from the implementation that dshowvideosrc
> outputs
> video/x-dv
> You should see it using -v option.
> Anyway, ffmpegcolorspace doest not handle video/x-dv, that's why you got
> "WARNING: erroneous pipeline: could not link dshowvideosrc0 to ffmpegcsp0"
> Then you could try to insert a ffdec_dvvideo (if you have it) bettween
> dshowvideosrc and ffmpegcolorspace.
> (note that I do not know if gstreamer has a dv decoder that does not come
> from gst-ffmpeg)
> Sincerely
> Julien
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