Re: [FFmpeg-devel] [PATCH 2/2] avformat/mov: Support parsing of still AVIF Alpha Channel

2022-07-12 Thread Vignesh Venkatasubramanian
On Tue, Jul 5, 2022 at 9:54 AM Anton Khirnov wrote: > > Quoting Vignesh Venkatasubramanian (2022-07-02 23:15:35) > > > As for encoding, not fully sure how it should be integrated, if any > > > encoders actually at this moment do proper alpha coding, or do all API > > > clients have to separately e

Re: [FFmpeg-devel] [PATCH 2/2] avformat/mov: Support parsing of still AVIF Alpha Channel

2022-07-05 Thread Anton Khirnov
Quoting Vignesh Venkatasubramanian (2022-07-02 23:15:35) > > As for encoding, not fully sure how it should be integrated, if any > > encoders actually at this moment do proper alpha coding, or do all API > > clients have to separately encode with one context the primary image, > > and the alpha wit

Re: [FFmpeg-devel] [PATCH 2/2] avformat/mov: Support parsing of still AVIF Alpha Channel

2022-07-03 Thread Vignesh Venkatasubramanian
On Sun, Jul 3, 2022 at 5:18 AM Jan Ekström wrote: > > On Sun, Jul 3, 2022 at 12:15 AM Vignesh Venkatasubramanian > wrote: > > > > On Sat, Jul 2, 2022 at 12:35 PM Jan Ekström wrote: > > > > > > On Sat, Jul 2, 2022 at 7:32 PM Vignesh Venkatasubramanian > > > wrote: > > > > > > > > On Sat, Jul 2,

Re: [FFmpeg-devel] [PATCH 2/2] avformat/mov: Support parsing of still AVIF Alpha Channel

2022-07-03 Thread Jan Ekström
On Sun, Jul 3, 2022 at 12:15 AM Vignesh Venkatasubramanian wrote: > > On Sat, Jul 2, 2022 at 12:35 PM Jan Ekström wrote: > > > > On Sat, Jul 2, 2022 at 7:32 PM Vignesh Venkatasubramanian > > wrote: > > > > > > On Sat, Jul 2, 2022 at 2:35 AM Anton Khirnov wrote: > > > > > > > > Quoting Vignesh V

Re: [FFmpeg-devel] [PATCH 2/2] avformat/mov: Support parsing of still AVIF Alpha Channel

2022-07-02 Thread Vignesh Venkatasubramanian
On Sat, Jul 2, 2022 at 12:35 PM Jan Ekström wrote: > > On Sat, Jul 2, 2022 at 7:32 PM Vignesh Venkatasubramanian > wrote: > > > > On Sat, Jul 2, 2022 at 2:35 AM Anton Khirnov wrote: > > > > > > Quoting Vignesh Venkatasubramanian (2022-06-30 23:04:34) > > > > Parse the alpha channel for still AVI

Re: [FFmpeg-devel] [PATCH 2/2] avformat/mov: Support parsing of still AVIF Alpha Channel

2022-07-02 Thread Jan Ekström
On Sat, Jul 2, 2022 at 7:32 PM Vignesh Venkatasubramanian wrote: > > On Sat, Jul 2, 2022 at 2:35 AM Anton Khirnov wrote: > > > > Quoting Vignesh Venkatasubramanian (2022-06-30 23:04:34) > > > Parse the alpha channel for still AVIF images and expose it as a > > > separate track. This is the simple

Re: [FFmpeg-devel] [PATCH 2/2] avformat/mov: Support parsing of still AVIF Alpha Channel

2022-07-02 Thread Vignesh Venkatasubramanian
On Sat, Jul 2, 2022 at 2:35 AM Anton Khirnov wrote: > > Quoting Vignesh Venkatasubramanian (2022-06-30 23:04:34) > > Parse the alpha channel for still AVIF images and expose it as a > > separate track. This is the simplest way of supporting AVIF alpha > > channel in a codec independent manner (sim

Re: [FFmpeg-devel] [PATCH 2/2] avformat/mov: Support parsing of still AVIF Alpha Channel

2022-07-02 Thread Anton Khirnov
Quoting Vignesh Venkatasubramanian (2022-06-30 23:04:34) > Parse the alpha channel for still AVIF images and expose it as a > separate track. This is the simplest way of supporting AVIF alpha > channel in a codec independent manner (similar to how ffmpeg > supports animated AVIF with alpha channel)

[FFmpeg-devel] [PATCH 2/2] avformat/mov: Support parsing of still AVIF Alpha Channel

2022-06-30 Thread Vignesh Venkatasubramanian
Parse the alpha channel for still AVIF images and expose it as a separate track. This is the simplest way of supporting AVIF alpha channel in a codec independent manner (similar to how ffmpeg supports animated AVIF with alpha channel). One can use the alphamerge filter to get a transparent image w