On 2021-07-18 09:32, Linjie Fu wrote:
On Wed, Jul 7, 2021 at 9:42 AM Linjie Fu <linjie.justin...@gmail.com> wrote:
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.
Another ping, thx.
I pushed changes to this code yesterday. I don't think it's required
anymore, but do test.
Regards,
Gyan
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