[FFmpeg-user] QT ProRes 4444 w/ Alpha

Carl Eugen Hoyos cehoyos at ag.or.at
Thu Jun 9 23:24:25 CEST 2016

Ashkan Daie <ashkan.daie <at> gmail.com> writes:

> 1. When trying to convert to qtrle, I do not get the alpha 
> channel.

Please provide your command line including the complete, 
uncut console output.

> 2. When converting from QT ProRes 4444 w/ alpha to h264 I 
> completely lose alpha channel.

H.264 does not support alpha.

> I know that h264 does not support alpha.

Then I am not sure I understand your question.

> I used Adobe Media Encoder w/ same source to h264 and it 
> looks like it blends the alpha channel in the final output. 
> Anyway I can get the same results using ffmpeg?

See the option -alphablend.

Carl Eugen

More information about the ffmpeg-user mailing list