Deblocking filter is missing

[torokati44]

This is not an essential feature, even the SWF spec itself states that the deblocking hint might be ignored by Flash Player too.

It could still slightly improve the appearance of https://z0r.de/4145 for example - look at the top corner of the white case of the alarm clock, and the rose next to it. Or the sky in https://z0r.de/3711.
I think, at least, that this movie has that hint set.

[torokati44]

Are we sure though, that the deblocking filter is never applied "in-loop" in Flash?
That is, the motion compensation uses the frame before deblocking filter, vs. after?
I think that is the case, because otherwise we would see severe artifacting in any video encoded by FFmpeg for example - which by default assumes deblocking will happen (and in fact due to this, creates more artifacting for us, with no deblocker).

The "in-loop" filter was added in Annex J, see: https://en.wikipedia.org/wiki/Deblocking_filter#H.263_Annex_J_deblocking_filter
Did Sorenson also take this over into FLV1?

[torokati44]

Fixed by #49.