[Libav-user] Adding alpha channel to h264 encoder

[Carl Eugen Hoyos]

2017-09-12 13:00 GMT+02:00 Davood Falahati <falahati.davood at gmail.com>:

> Now, I want to add an alpha channel to my resulting video.

Transparency in H.264 exists, an example is the file
alphaconformanceG.264 in alphaconformanceG.zip, but
libx264 (and no other h264 encoder I know) does not support
encoding such files and libavcodec (and no decoder I know)
does not support decoding the transparency layer.

Carl Eugen