Re: [FFmpeg-devel] [PATCH v4 0/1] lavfi/vf_gopromax_opencl: add GoPor Max 360 video filter

[TADANO Tokumei <aimingoff@pc.nifty.jp>]

ping

On 2024/08/03 9:56, TADANO Tokumei wrote:
> This is updated patch of:
> https://patchwork.ffmpeg.org/project/ffmpeg/list/?series=3943
> I contacted to Ronan LE MEILLAT and agreed with him to submit new patch.
> 
> Abstruct of GoPro Max .360 video file format is described in:
> https://gopro.com/news/max-tech-specs-stitching-resolution
> 
> The specification is little bit buggy.
> The format is based on EAC (Equi-Angular Cubemap), and there are overlapped
> pixels at boundaries of front and rear cams.
> Probably, the desinger intended to add 2 x 32 (= total 64) ovelapped pixels.
> But actual format has 2 x 64 pixels overlapped area.
> Thus the width will be 2 x 32 pixels shorter than standard EAC format after
> blending overlapped area.
> 
> This filter blends overlapped area, stretches the width of the cube,
> and combine two streams into single stream with standard format.
> 
> v3: modifies `configure` file to add dependency on opencl.
> v4: fix small difference from v360 filter in xyz_to_eac()

The filter is not generic filter but for specific device.
If there is no bad influence to other filters and/or codecs, please apply this patch.

Sample .360 files of GoPro Max can be found at:
https://bit.ly/x3vsmax
https://drive.google.com/drive/folders/1h-ks7-jxV6uRE_pcrKMGsaIiPRjJ0eW

Thanks,

> TADANO Tokumei (1):
>    lavfi/vf_gopromax_opencl: add GoPro Max 360 video filter
> 
>   configure                        |   1 +
>   doc/filters.texi                 |  78 +++++++
>   libavfilter/Makefile             |   2 +
>   libavfilter/allfilters.c         |   1 +
>   libavfilter/opencl/gopromax.cl   | 282 +++++++++++++++++++++++++
>   libavfilter/opencl_source.h      |   1 +
>   libavfilter/vf_gopromax_opencl.c | 351 +++++++++++++++++++++++++++++++
>   7 files changed, 716 insertions(+)
>   create mode 100644 libavfilter/opencl/gopromax.cl
>   create mode 100644 libavfilter/vf_gopromax_opencl.c
> 
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