Codecs + Alpha Channel

[Tommato]

Hi,

is it possible with GStreamer to save a mov file with alpha channel? If so what codec(s) and muxer(s) should be used?

Thx

Tom

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[Gst-Geek]

"Alpha" Did you mean overlay here ??



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[Tommato]

Ola ShilVin!

Thanks for your answer!
Like in QuickTime.. Alpha channel, it’s a extra channel which represents
opacity.

https://developer.apple.com/documentation/appkit/nsimagerep/1534506-alpha?language=occ
https://developer.apple.com/documentation/appkit/nscolor

Thanks
Tom



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[Tommato]

Ola ShilVin,

I found some info for what I was looking for.. let test first..

https://stackoverflow.com/questions/44790561/how-do-i-save-a-video-with-an-alpha-channel-in-gstreamer

Thanks

Tom



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[Tommato]

Ola ShilVin!

I tried here and I had this error..
*WARNING: erroneous pipeline: could not parse caps "video/x
raw,format=BGRA,framerate=30/1"*

our task is to write a QuickTime movie frame by frame from memory (app data)
with RGB + A.

Thanks

Tom



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[Tim Müller]

On Tue, 2018-07-24 at 09:12 -0500, Tommato wrote:

Hi,

>
> our task is to write a QuickTime movie frame by frame from memory
> (app data) with RGB + A.

Have you considered/tried encoding frames as PNG? That should be
lossless and allow for an alpha channel.

qtmux currently doesn't support raw RGB video with an alpha channel. If
you know a mapping for that and/or have a sample file, that could
probably be added fairly easily though.

Cheers
-Tim

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Tim Müller, Centricular Ltd - http://www.centricular.com

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