[FFmpeg-devel] apng support

[Paul B Mahol]

On 12/27/12, Don Moir <donmoir at comcast.net> wrote:
> ----- Original Message -----
> From: "Paul B Mahol" <onemda at gmail.com>
> To: "FFmpeg development discussions and patches" <ffmpeg-devel at ffmpeg.org>
> Sent: Thursday, December 27, 2012 12:31 PM
> Subject: Re: [FFmpeg-devel] apng support
>
>
>> On 12/27/12, Don Moir <donmoir at comcast.net> wrote:
>>> Doing gif animation sets the stage for doing apng animation.
>>>
>>> I had to add apng support internally outside of ffmpeg. It was easy
>>> enough
>>> if you start out with libpng and apply the apng patches, but really
>>> don't
>>> know how this would fit in with the current ffmpeg png support.
>>>
>>> Disposal methods are similar to gif but apng also adds blend ops.
>>>
>>> The bulk of the work would be in patching existing ffmpeg png code.
>>
>> You want to sponsor apng in ffmpeg?
>
> It would take someone familiar with the existing ffmpeg png code I believe.
> Patching libpng was straight forward and if someone is
> familiar with ffmpeg png and libpng that would be good.

OK, I'm familar with png code in lavc and also already wrote mng vlc demuxer.
So apng would be just this: apng demuxer and apng decoder (which would
be in same
                                                           file as png decoder).