[FFmpeg-user] piped ffmpeg output to movie filter with preserved alpha channel

[Alex Vasilenko]

On Wednesday, March 27, 2013 at 12:57 , Carl Eugen Hoyos wrote:
> Alex Vasilenko <aa.vasilenko <at> gmail.com (http://gmail.com)> writes:
> 
> > ffmpeg -loop 1 -i watermark2.jpg -t 5 -c qtrle [...] 
> > -f mpegts -pix_fmt argb -
> > 
> 
> 
> mpegts does not support the qtrle codec, this is not a FFmpeg 
> limitation, but a limitation of the specification.
> 
> 

mpegts was just an example. I've tried a lot of combinations of codec/container to pipe but all of them exits with error. 
Maybe FFmpeg community knows exact combination of codec/container that can be piped with preserved alpha channel?
> 
> (It is a bug imo that FFmpeg tries to mux something in a 
> transport stream that certainly cannot be decoded.)
> 
> Carl Eugen
> 
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