On Thu, Mar 21, 2019 at 11:09:21AM -0400, Shaofei Wang wrote: > It enabled MULTIPLE SIMPLE filter graph concurrency, which bring above about > 4%~20% improvement in some 1:N scenarios by CPU or GPU acceleration > > Below are some test cases and comparison as reference. > (Hardware platform: Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz) > (Software: Intel iHD driver - 16.9.00100, CentOS 7) > > For 1:N transcode by GPU acceleration with vaapi: > ./ffmpeg -vaapi_device /dev/dri/renderD128 -hwaccel vaapi \ > -hwaccel_output_format vaapi \ > -i ~/Videos/1920x1080p_30.00_x264_qp28.h264 \ > -vf "scale_vaapi=1280:720" -c:v h264_vaapi -f null /dev/null \ > -vf "scale_vaapi=720:480" -c:v h264_vaapi -f null /dev/null > > test results: > 2 encoders 5 encoders 10 encoders > Improved 6.1% 6.9% 5.5% > > For 1:N transcode by GPU acceleration with QSV: > ./ffmpeg -hwaccel qsv -c:v h264_qsv \ > -i ~/Videos/1920x1080p_30.00_x264_qp28.h264 \ > -vf "scale_qsv=1280:720:format=nv12" -c:v h264_qsv -f null /dev/null \ > -vf "scale_qsv=720:480:format=nv12" -c:v h264_qsv -f null /dev/null > > test results: > 2 encoders 5 encoders 10 encoders > Improved 6% 4% 15% > > For Intel GPU acceleration case, 1 decode to N scaling, by QSV: > ./ffmpeg -hwaccel qsv -c:v h264_qsv \ > -i ~/Videos/1920x1080p_30.00_x264_qp28.h264 \ > -vf "scale_qsv=1280:720:format=nv12,hwdownload" -pix_fmt nv12 -f null > /dev/null \ > -vf "scale_qsv=720:480:format=nv12,hwdownload" -pix_fmt nv12 -f null > /dev/null > > test results: > 2 scale 5 scale 10 scale > Improved 12% 21% 21% > > For CPU only 1 decode to N scaling: > ./ffmpeg -i ~/Videos/1920x1080p_30.00_x264_qp28.h264 \ > -vf "scale=1280:720" -pix_fmt nv12 -f null /dev/null \ > -vf "scale=720:480" -pix_fmt nv12 -f null /dev/null > > test results: > 2 scale 5 scale 10 scale > Improved 25% 107% 148% > > Signed-off-by: Wang, Shaofei <shaofei.w...@intel.com> > Reviewed-by: Michael Niedermayer <mich...@niedermayer.cc> > Reviewed-by: Mark Thompson <s...@jkqxz.net> > --- > The patch will only effect on multiple SIMPLE filter graphs pipeline, > Passed fate and refine the possible data race, > AFL tested, without introducing extra crashs/hangs: > > american fuzzy lop 2.52b (ffmpeg_g) > > ┌─ process timing ─────────────────────────────────────┬─ overall results > ─────┐ > │ run time : 0 days, 9 hrs, 48 min, 48 sec │ cycles done : 0 > │ > │ last new path : 0 days, 0 hrs, 0 min, 0 sec │ total paths : > 1866 │ > │ last uniq crash : none seen yet │ uniq crashes : 0 > │ > │ last uniq hang : 0 days, 9 hrs, 19 min, 23 sec │ uniq hangs : > 35 │ > ├─ cycle progress ────────────────────┬─ map coverage > ─┴───────────────────────┤ > │ now processing : 0 (0.00%) │ map density : 24.91% / 36.60% > │ > │ paths timed out : 0 (0.00%) │ count coverage : 2.40 bits/tuple > │ > ├─ stage progress ────────────────────┼─ findings in depth > ────────────────────┤ > │ now trying : calibration │ favored paths : 1 (0.05%) > │ > │ stage execs : 0/8 (0.00%) │ new edges on : 1100 (58.95%) > │ > │ total execs : 123k │ total crashes : 0 (0 unique) > │ > │ exec speed : 3.50/sec (zzzz...) │ total tmouts : 52 (47 unique) > │ > ├─ fuzzing strategy yields ───────────┴───────────────┬─ path geometry > ────────┤ > │ bit flips : 0/0, 0/0, 0/0 │ levels : 2 > │ > │ byte flips : 0/0, 0/0, 0/0 │ pending : 1866 > │ > │ arithmetics : 0/0, 0/0, 0/0 │ pend fav : 1 > │ > │ known ints : 0/0, 0/0, 0/0 │ own finds : 1862 > │ > │ dictionary : 0/0, 0/0, 0/0 │ imported : n/a > │ > │ havoc : 0/0, 0/0 │ stability : > 76.69% │ > │ trim : 0.00%/1828, n/a > ├────────────────────────┘ > └─────────────────────────────────────────────────────┘ [cpu000: > 59%] > > fftools/ffmpeg.c | 172 > +++++++++++++++++++++++++++++++++++++++++++++++++------ > fftools/ffmpeg.h | 13 +++++ > 2 files changed, 169 insertions(+), 16 deletions(-)
This changes the output for some cases like: ./ffmpeg -y -i mm-short.mpg -flags +aic -qscale 2 -vcodec h263p -t 1 -qscale 10 old.avi -rw-r----- 1 michael michael 86434 Mar 22 01:07 new.avi -rw-r----- 1 michael michael 86402 Mar 22 01:07 old.avi i assume this is unintended [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB "I am not trying to be anyone's saviour, I'm trying to think about the future and not be sad" - Elon Musk
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