[FFmpeg-devel] ProRes 4444 with Alpha Channel

[Andy_Copeland at scee.net]

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>>On Wed, Aug 7, 2013 at 5:29 PM,  <Andy_Copeland at scee.net> wrote:
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>>
>> 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 question should rather go to the ffmpeg-user mailing list, so
> when you reply to this, it probably makes sense to use or cc to the
> ffmpeg-user list (not sure what the correct process is, someone with
> more experience?).
>
> Please write what the actual problem is, i.e. what is not working and
> then provide uncut console output of your ffmpeg run.
>
> My gut-feeling is that you may be using an older ffmpeg version that
> is from the time before alpha support was added to the prores encoder
> (not so long ago). AFAIK what you want to do should work. I have
> tested preserving alpha from a PNG to an ffmpeg-generated prores file
> myself.
> _______________________________________________
> ffmpeg-devel mailing list
> ffmpeg-devel at ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/ffmpeg-devel


Hi there,

Thanks very much for quick the reply!

Have copied in FFMPEG-User as suggested.

I don't suppose anyone has a compiled Windows x86 or x64 version of the
latest FFMPEG / a version that supports Alpha channel ProRes 4444.

Thanks in advance!

ac

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


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