Info on how to reproduce it with very little effort: Convert some movie into m2v and force intra dc precision to 11: ffmpeg -i somemovie -sameq -dc 11 out_11.m2v
on unit simply play it using vaapi: mplayer -vo vaapi -va vaapi out_11.m2v The DC-levels on the I-frames are completely off. Using -dc 10 on the ffmpeg line will produce a movie that is perfectly playable. I assume the problem lies either in the va-backend (driver), in the micro code of the chip (driver binary blob) or in the chip itself (HW problem). Can you confirm? Also I haven't read the MPEG2 spec closely enough to confirm that a intra dc precision value of 3 (i.e. 11 bits) are ok when using main profile... Kind regards, Andreas Larsson > Another problem I've stumbled upon is that when using intra_dc_precision = 3 > (i.e. 11-bit DC-predictors) the chip doesn't decode the stream properly. The > DC levels are completely off both in luma and in chroma. Decoding the same > stream using VLC or software mplayer etc displays it correctly. > > VA: v0.31.1 VAProfileMPEG2Main + VAEntrypointVLD > CPU : Intel ATOM Z510 > GFX: Intel US15W > OS: Linux Fedora 14 > X.Org: X.Org X Server 1.9.4 > GFX-driver: Intel(R) Embedded Media and Graphics Driver version 1.14.2443 > > Switching to intra_dc_precision = 2 (i.e. 10-bit DC predictors) decodes > correctly though. Do you have any erratas on this or any helpful insights? > > Kind regards, Andreas Larsson _______________________________________________ Libva mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/libva
