On Thu, May 23, 2019 at 10:57:14AM +0200, Carl Eugen Hoyos wrote: > Am Do., 23. Mai 2019 um 01:47 Uhr schrieb Michael Niedermayer > <mich...@niedermayer.cc>: > > > > Fixes: Timeout (14sec -> 9sec) > > Fixes: > > 13398/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FFV1_fuzzer-5664106709778432 > > > > Found-by: continuous fuzzing process > > https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg > > Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> > > --- > > libavcodec/ffv1dec_template.c | 8 ++++++++ > > 1 file changed, 8 insertions(+) > > > > diff --git a/libavcodec/ffv1dec_template.c b/libavcodec/ffv1dec_template.c > > index 1b7f6c4bf5..0b1d176ba1 100644 > > --- a/libavcodec/ffv1dec_template.c > > +++ b/libavcodec/ffv1dec_template.c > > @@ -86,11 +86,19 @@ static av_always_inline int > > RENAME(decode_line)(FFV1Context *s, int w, > > run_mode = 2; > > } > > } > > + if (sample[1][x - 1] == sample[0][x - 1]) { > > + while (run_count > 1 && w-x > 1) { > > + sample[1][x] = sample[0][x]; > > + x++; > > + run_count--; > > + } > > + } else { > > Does this change have a measurable effect on your usual sample files?
decode_line() becomes 1% faster for fate/vsynth2-ffv1.avi for another fate sample there is a 0.5% speedup the effect should be bigger for files with "flat" colored areas the new faster branch is used in 97-100% of the cases in fate samples compared to the older more complex (which i tested) vsynth3-ffv1-v3-bgr0.avi had the lowest percentual useage of about 97% [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB Many that live deserve death. And some that die deserve life. Can you give it to them? Then do not be too eager to deal out death in judgement. For even the very wise cannot see all ends. -- Gandalf
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