On Sun, Jul 4, 2021 at 10:50 PM Linjie Fu <fulin...@zju.edu.cn> wrote: > > From: Linjie Fu <linjie.justin...@gmail.com> > > Skip the logic of frame rate emulation until the input reaches the > specified start time. > > Test CMD: > $ffmpeg -re -ss 30 -i input.mp4 -pix_fmt yuv420p -f sdl2 - > > Before the patch: > first time to got frame, it takes 257305 us > After this patch: > first time to got frame, it takes 48879 us > > Signed-off-by: Linjie Fu <linjie.justin...@gmail.com> > --- > [v2]: fixed the mixed declaration and code warning > Calculate the time to get the first frame: > https://github.com/fulinjie/ffmpeg/commit/2aa4762e1e65709997b1ab9dd596332244db80ed > fftools/ffmpeg.c | 8 ++++++-- > 1 file changed, 6 insertions(+), 2 deletions(-) > > diff --git a/fftools/ffmpeg.c b/fftools/ffmpeg.c > index e97d879cb3..c8849e4250 100644 > --- a/fftools/ffmpeg.c > +++ b/fftools/ffmpeg.c > @@ -4221,10 +4221,14 @@ static int get_input_packet(InputFile *f, AVPacket > **pkt) > { > if (f->rate_emu) { > int i; > + int64_t pts; > + int64_t now; > for (i = 0; i < f->nb_streams; i++) { > InputStream *ist = input_streams[f->ist_index + i]; > - int64_t pts = av_rescale(ist->dts, 1000000, AV_TIME_BASE); > - int64_t now = av_gettime_relative() - ist->start; > + if (!ist->got_output) > + continue; > + pts = av_rescale(ist->dts, 1000000, AV_TIME_BASE); > + now = av_gettime_relative() - ist->start; > if (pts > now) > return AVERROR(EAGAIN); > } > -- > 2.31.1 ping, thx.
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