[gst-devel] Make transparent a specific color inside a video

megabug megabug at autistici.org
Sat Oct 31 15:01:37 CET 2009

On Friday 30 October 2009 12:59:17 Kapil Agrawal wrote:
> Probably videobox and videomixer may fix it
> -kapil

No, as I stated before in my email, changing the whole frame alpha value is 
not useful in my case.

Anyway I managed to find the solution myself: the "alpha" plugin works and 
provides a chroma-key feature that is exacly what I needed.

Now I have another problem: PgmImageSink (in pigment library) refuses to 
receive a stream with Alpha channel in it. 

filesrc -> decodebin -> alpha -> pgmimagesink (doesn't work)

If I put an ffmpegcolorspace, the pipeline runs successfully but the alpha 
channel is filtered.

filesrc -> decodebin -> alpha -> ffmpegcolorspace -> pgmimagesink
(works but ffmpegcolorspace removes the alpha channel)

Even using capsfilter to force a colorspace with alpha channel won't work.
I think that the problem is in pgmimagesink, but any suggestions are welcome!

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