[FFmpeg-devel] ProRes 4444 with Alpha Channel

[Andy_Copeland at scee.net]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256


Hi there,

We are currently investigating an automated process of generating ProRes
assets from PNG image sequences but need some help with getting the Alpha
Channel working with ProRes 4444 on FFMPEG.

We're running FFMPEG on Windows 7 x64 machines and we are sure that the
Alpha Channel is preserved when the output PNG's are generated from our
various different pieces of motion graphics software.

The command we're using is as follows:

ffmpeg -r 30 -i "c:\Users\<username>\Desktop\Cube Vibrate\results
\Cube%04d.png" -vcodec prores_ks -profile:v 4444 -pix_fmt yuva444p10le
- -alpha_bits 8 -acodec copy "c:\Users\<username>\Desktop\Cube Vibrate
\results\cube_vibrate_10.mov"

Any help that can be given on this will be SOOOOO appreciated as it's been
stumping us for a day or so now! I'm pretty sure it's just me being stupid
- - but want to know for sure!


Thanks in advance!!

ac

Kind Regards,

Andy Copeland
Virtualisation Specialist | World Wide Studios Europe
T. +44 (0)20 7859 0269
Sony Computer Entertainment Europe Limited.
http://uk.playstation.com/


**********************************************************************
This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify postmaster at scee.net
This footnote also confirms that this email message has been checked for all known viruses.
Sony Computer Entertainment Europe Limited
Registered Office: 10 Great Marlborough Street, London W1F 7LP, United Kingdom
Registered in England: 3277793
**********************************************************************


-----BEGIN PGP SIGNATURE-----
Version: PGP Universal 3.3.0 (Build 9269)
Charset: us-ascii

wsBVAwUBUgJn0ogtkn60BdOeAQj81gf+OX41tuxE3VuwjRPc6ycaxCRctaWX3Qcz
hE9RYJYF3UtSTqwhMnUhHvmLBJVRYZSKVrPsK0h3spxakh/npZrMXRNJrp32DILC
FSyOsk5ByxH3sjmDcHo8jHa8SFlIOkWVFLUk/iRS1hBmYK/A6jzlOtjFF1dXQyyT
UrAspfkAgyzQmkUGBGbZF7N5km1UF5QH6T8SjzOz0mpfKqIpcC7th60T/Bpqqtps
dgX70Fvnh+oOQmp5fqb1TeneZj+gXLGHjETG+E3nOKNNZOhDUOPD2sa1xZg2rWZb
rVeNtqgzHLzEL6Sx0xPj4htLk4QSxBinU/pMQmG2+cv1c9trV7L0Bg==
=B/jk
-----END PGP SIGNATURE-----