[v4] slices

[retokromer]

There are some problems with the way slices are managed in versions 0 to 3, which in my opinion should be addressed in version 4.

E.g. with a 1536 = 2 ^ 9 x 3 pixel height image (i.e. a multiple of 4), I got the error message:

I guess, it would be easier to work with slices_x and slices_y values rather than to use a single value.

[dwbuiten]

This is not a spec limitation, but an encoder limitation AFAICT.

[retokromer]

There is a discussion to focus the pseudo-code in the specifications on the decoder. I guess this should be explained there.

[dericed]

I don't understand what the problems are or what the fix would be. For ffv1 with version >=3 the values for slice_x and slice_y are independent values within the slice header and they don't need to be the same value. If the version is <=3 then there is no slice header and thus no slice_x and slice_y, so the non-existent values are the same (I guess).

At any rate, if you're discussing an issue that is about a particular ffv1 encoder and not the specification then the issue should be closed.

[dwbuiten]

I agree, this issue is specific only to the implementation of the FFV1 encoder in ffmpeg, and is unrelated any restrictions in the spec.

[retokromer]

this issue is specific only to the implementation of the FFV1 encoder in ffmpeg

I see, closing.