[gst-devel] Call for patch review: Add 'caps' property for playbin

[Zhao, Halley]

I remember another case to benefit from the 'caps' of playbin.
If we use playbin and customized video sink for thumbnail generation, we don’t expect decodebin2 stop at 'video/x-raw-va' but 'video/x-raw-rgb'. It is different from playback.
So we need the flexibility from playbin to handle the difference of the two cases.
Could you agree?


-----Original Message-----
From: Zhao, Halley [mailto:halley.zhao at intel.com] 
Sent: 2010年7月15日 15:15
To: Discussion of the development of GStreamer
Subject: Re: [gst-devel] Call for patch review: Add 'caps' property for playbin

Thanks Stefan.
As to "video/x-raw-va", I will follow it up in bugzilla.

However, I don't it is a burden for application developer to set 'caps' property of playbin, but provide flexibility for customized codec with corresponding sink. For example:
Some audio dsp could accept compressed audio data, there may be a new caps as 'audio/x-raw-mp3' for such device.
I guess there may also be some special caps for drm stream after decode.



-----Original Message-----
From: Stefan Kost [mailto:ensonic at hora-obscura.de] 
Sent: 2010年7月14日 20:21
To: gstreamer-devel at lists.sourceforge.net
Subject: Re: [gst-devel] Call for patch review: Add 'caps' property for playbin

Hi Zhao,

On 13.07.2010 05:13, Zhao, Halley wrote:
>
> ‘caps’ property are defined for decodebin2/uridecodebin as “The caps
> on which to stop decoding. (NULL= default)”.
>
> But there is no ‘caps’ property for playbin2 yet, we’d better add it
> as well to give app the flexibility of controlling decodebin2 for
> newly introduced raw video caps; ‘video/x-raw-va’ for example.
>
I don't think we want to burden application developers with setting that. We should probably add this to the raw caps.
I'd suggest to file a bug about it and attach the current patch there. I think the current GSoC project on vdpau will
face the same issue. In the case of ‘video/x-raw-va’, chances of adding it are higher if there are public plugins
that use it somewhere.

Stefan



> I met issues for creating a customized sink for libva:
> ‘video/x-raw-va’; my sink renders video frame as texture in Qt.
>
> When I set playbin2 ‘video-sink’ to my customized sink, decodebin2
> doesn’t stop auto-plug (expose_pad) when it comes to ‘video/x-raw-va’
> because decodebin2 doesn’t think ‘video/x-raw-va’ is a raw type.
>
> (by the way, the auto-plug stops when playbin2 realize it comes to a
> sink; however this sink is not my customized sink. because my sink
> requires many app context (OpenGL etc), it is similar to clutter-gst sink)
>
> I think it is better to add ‘caps’ property for playbin2 as well, then
> app could control decodebin2 with flexibility for newly introduced raw
> caps.
>
> *ZHAO, Halley (Aihua)*
>
> Email: halley.zhao at intel.com <blocked::mailto:aihua.zhao at intel.com>
>
> Tel: +86(21)61166476 iNet: 8821-6476
>
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