Comments on: Python gstreamer controller

By: rossana

rossana — Thu, 08 Sep 2011 23:12:12 +0000

First, thanks for your response. Second, sorry for too many posts. I didn’t see the previous one when I check your blog, I thought they got lost.

I wasn’t clear enough. actually I know what the alpha channel is. I don’t know how to ensamble these channel with the video streamer, there’s no connection between the video sources and the operation bin which has the alpha channels. I assume alpha1 ‘runs’ first, since alpha2 has a start time.

My question it’s more focused on how GStreamer elements work in this example. Thanks a lot, best regards.
Rossana

By: lane

lane — Thu, 08 Sep 2011 18:47:54 +0000

Rossanna,

See http://en.wikipedia.org/wiki/Alpha_compositing

I do not use a decodebin2 in the crossfade example because I use generated video streams.

By: rossana

rossana — Thu, 08 Sep 2011 18:34:13 +0000

Hello, actually I saw your crossfade example, I am new programming with GStreamer and with audio/video issues. I don’t get why you don’t use a decodebin2 or player in that example as you use in this one.
Second, could you please explain me which rol and the strategy the alpha channel take?.
Thanks a lot in advance.

Rossana

By: rossana

rossana — Thu, 08 Sep 2011 05:00:34 +0000

Sorry I refer to crossfade example, but I couldn’t post a comment.
Regards

By: rossana

rossana — Thu, 08 Sep 2011 04:42:55 +0000

Hi, I am totaly new programming with GStreamer and with audiovisual issues as well. I don’t get the alpha channels strategy. How is the behavior of these channels with the video. I understand de alpha2 get into scene at a certain time to help the crossfade phase. I appreciate your response, thanks.