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List: gstreamer-devel
Subject: Re: [gst-devel] Make transparent a specific color inside a video
From: megabug <megabug () autistici ! org>
Date: 2009-10-31 14:01:37
Message-ID: 200910311501.37370.megabug () autistici ! org
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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!
Bye
--
megabug
[Attachment #5 (text/html)]
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN" \
"http://www.w3.org/TR/REC-html40/strict.dtd"><html><head><meta name="qrichtext" \
content="1" /><style type="text/css">p, li { white-space: pre-wrap; \
}</style></head><body style=" font-family:'DejaVu Sans'; font-size:9pt; \
font-weight:400; font-style:normal;">On Friday 30 October 2009 12:59:17 Kapil Agrawal \
wrote:<br> > Probably videobox and videomixer may fix it<br>
><br>
> -kapil<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; \
margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; \
-qt-user-state:0;"><br></p>No, as I stated before in my email, changing the whole \
frame alpha value is not useful in my case.<br> <p style="-qt-paragraph-type:empty; \
margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; \
-qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>Anyway I managed to \
find the solution myself: the "alpha" plugin works and provides a chroma-key feature \
that is exacly what I needed.<br> <p style="-qt-paragraph-type:empty; margin-top:0px; \
margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; \
text-indent:0px; -qt-user-state:0;"><br></p>Now I have another problem: PgmImageSink \
(in pigment library) refuses to receive a stream with Alpha channel in it. <br> <p \
style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; \
margin-right:0px; -qt-block-indent:0; text-indent:0px; \
-qt-user-state:0;"><br></p>filesrc -> decodebin -> alpha -> pgmimagesink \
(doesn't work)<br> <p style="-qt-paragraph-type:empty; margin-top:0px; \
margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; \
text-indent:0px; -qt-user-state:0;"><br></p>If I put an ffmpegcolorspace, the \
pipeline runs successfully but the alpha channel is filtered.<br> <p \
style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; \
margin-right:0px; -qt-block-indent:0; text-indent:0px; \
-qt-user-state:0;"><br></p>filesrc -> decodebin -> alpha -> ffmpegcolorspace \
-> pgmimagesink<br> (works but ffmpegcolorspace removes the alpha channel)<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; \
margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; \
-qt-user-state:0;"><br></p>Even using capsfilter to force a colorspace with alpha \
channel won't work.<br> I think that the problem is in pgmimagesink, but any \
suggestions are welcome!<br> <p style="-qt-paragraph-type:empty; margin-top:0px; \
margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; \
text-indent:0px; -qt-user-state:0;"><br></p>Bye<br>
-- <br>
megabug</p></body></html>
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