> From: ffmpeg-devel <ffmpeg-devel-boun...@ffmpeg.org> On Behalf Of > Mark Thompson > Sent: Monday, April 13, 2020 20:20 > To: ffmpeg-devel@ffmpeg.org > Subject: Re: [FFmpeg-devel] [PATCH] lavc/vaapi_encode_h265: fix > max_transform_hierarchy_depth_inter/intra > > On 13/04/2020 05:32, Linjie Fu wrote: > > Set the max_transform_hierarchy_depth_inter/intra to 2 by default > > based on the Programmer's Reference Manuals (PRM) in [1]. > > > > Intel Encoder only supports 2 levels of quad-tree. That is: > > - max_transform_hierarchy_depth_inter/intra <= 2. > > > > [1] <https://01.org/sites/default/files/documentation/intel-gfx-prm-osrc- > kbl-vol10-hevc.pdf> > > > > Signed-off-by: Linjie Fu <linjie...@intel.com> > > --- > > Fixed value for intel platform, makes more sense on TGL+ platform. > > (If conflict with other driver capability, we may add query support > > later) > > libavcodec/vaapi_encode_h265.c | 5 +++-- > > 1 file changed, 3 insertions(+), 2 deletions(-) > > > > diff --git a/libavcodec/vaapi_encode_h265.c > b/libavcodec/vaapi_encode_h265.c > > index cd48545..d6cb82a 100644 > > --- a/libavcodec/vaapi_encode_h265.c > > +++ b/libavcodec/vaapi_encode_h265.c > > @@ -445,8 +445,9 @@ static int > vaapi_encode_h265_init_sequence_params(AVCodecContext *avctx) > > sps->log2_min_luma_transform_block_size_minus2 = 0; > > sps->log2_diff_max_min_luma_transform_block_size = 3; > > // Full transform hierarchy allowed (2-5). > > - sps->max_transform_hierarchy_depth_inter = 3; > > - sps->max_transform_hierarchy_depth_intra = 3; > > + // Default to 2 based on Programmer's Reference Manuals of Intel > graphics > > + sps->max_transform_hierarchy_depth_inter = 2; > > + sps->max_transform_hierarchy_depth_intra = 2; > > // AMP works. > > sps->amp_enabled_flag = 1; > > // SAO and temporal MVP do not work. > > > > I don't much like the idea of changing this based on a value in a Kaby Lake > document given that the current value hasn't had any problems on Kaby Lake. > Can you explain the benefits of changing this?
It fixes the encoding issue for HEVC on gen12+ platform. We didn't notice this either, until it triggers gpu hang for encoding on Tiger Lake (gen12). > Can you confirm that it continues to work on all the other currently-working > platforms? > Yes, we set up CI and runs full-round tests for conformance and catch regression on different platforms(CFL/CML/ICL/KBL/SKL). Identical fix has been merged in gstreamer-vaapi, no regression is detected on other platforms. https://gitlab.freedesktop.org/gstreamer/gstreamer-vaapi/-/merge_requests/282/diffs?commit_id=17d82e14e78af901f1cd7f2344e173ad6ae6a8a6 - Linjie _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
