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 _______________________________________________ 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".
