[gst-devel] Firewire cameras with DirectShow

[Phil Rendell]

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

>  You could tell us the output you get with the 2 following pipelines:
>
> gst-launch-0.10 -v dshowvideosrc ! "video/x-dv, systemstream=0" ! fakesink
>
> and
>
> gst-launch-0.10 -v dshowvideosrc ! "video/x-dv, systemstream=1" ! fakesink
>


>  One should fail with a link error. The other one should lead to the crash
> you got.
>

Sorry, no joy with this. Both complained about an erroneous pipeline. I
don't think this could be the same error as before with feeding
dshowvideosrc into ffmpegcolorspace, as if I remover the systemstream
property, or set it to either true or false, gst-launch crashes. Setting it
to anything else appears to cause the erroneous pipeline error.

 D:\Camera\Common\GStreamer\bin>gst-launch-0.10.exe -v dshowvideosrc !
"video/x-dv, systemstream=0" ! fakesink
WARNING: erroneous pipeline: could not link dshowvideosrc0 to fakesink0
D:\Camera\Common\GStreamer\bin>gst-launch-0.10.exe -v dshowvideosrc !
"video/x-dv, systemstream=1" ! fakesink
WARNING: erroneous pipeline: could not link dshowvideosrc0 to fakesink0
D:\Camera\Common\GStreamer\bin>gst-launch-0.10.exe -v dshowvideosrc !
"video/x-dv, systemstream=2" ! fakesink
WARNING: erroneous pipeline: could not link dshowvideosrc0 to fakesink0
D:\Camera\Common\GStreamer\bin>gst-launch-0.10.exe -v dshowvideosrc !
fakesink
Setting pipeline to PAUSED ...
<Crash>
D:\Camera\Common\GStreamer\bin>


>
> Then about the crash and the division by zero. I have some ideas but could
> you tell us
> if there is any framerate (fps) infos in the page properties of the filter
> and the outpins using graphedit.
> Finally right click on the output pin and then select render pin. Then play
> the graph.
> Does it play correctly?
>


There does not appear to be any frame rate information in either output pin,
nor information about the output size, or compression information. The same
goes for either output pin. Rendering the DV A/V Out pin results in DV
Splitter, DV Video Decoder, Video Renderer and Default DirectSound Device
filters being created. Playing this results in the output from the camera
being displayed on screen.

I was wondering if I set the other attributes such as format, width, height
and framerate to see if this makes a difference, but am a little puzzled
about the output:

D:\Camera\Common\GStreamer\bin>gst-launch-0.10.exe -v dshowvideosrc !
"video/x-dv, format=dvsd, width=640, height=480, framerate=10" ! fakesink
Setting pipeline to PAUSED ...
** (gst-launch-0.10:2448): WARNING **: your desired video size is not valid
: 640 mod 1244160 !=0

** (gst-launch-0.10:2448): WARNING **: your desired video size is not valid
: 480 mod 1577311108 !=0
<Crash>


Phil



>
> Julien
>
>
>>
>> Phil
>>
>>
>>  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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