[FFmpeg-devel] [PATCH v2] avcodec/vc1: fix overlap smoothing filter for P frames

Jerome Borsboom jerome.borsboom at carpalis.nl
Mon Jun 4 11:45:16 EEST 2018

> The patch also fixes SSL0014.rcv, the only sample in this directory
> that still doesn't decode bit-exact is SSL0015.rcv, I don't know if the
> issue is also loopfilter-related.
> Thank you, Carl Eugen

Could someone with access to the test files check the output of the
Intel hardware decoder through VAAPI for file SSL0015.rcv? I am running
into an issue that may be a hardware bug, but I only have Haswell
platform to test on. It looks like the hardware tries to read beyond the
end of the slice data and subsequently fails to output the last
macroblock of the image.

ffmpeg -hwaccel vaapi -i SSL0015.rcv -pix_fmt yuv420p -f framecrc -

The frames of interest are frames 221 and 301. The CRCs from the
reference decoder are:

0,        221,        221,        1,    38016, 0x0c2f9de6
0,        301,        301,        1,    38016, 0x6877442f

My Haswell gives:

0,        221,        221,        1,    38016, 0xd8709e80
0,        301,        301,        1,    38016, 0x20bd44e7



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