I've encountered the same problem, and tracked it to guess_status_pts
function which tries to take the end timestamp from the input links
however without converting it to correct time base. Sent a patch, PTAL.
On Tue, Oct 3, 2017 at 5:36 PM, Thomas Mundt <tmund...@gmail.com> wrote:
> Hi Nicolas,
>
> 2017-09-07 10:59 GMT+02:00 Nicolas George <geo...@nsup.org>:
>
> > Signed-off-by: Nicolas George <geo...@nsup.org>
> > ---
> > ffmpeg.c | 10 +++++++---
> > 1 file changed, 7 insertions(+), 3 deletions(-)
> >
> > diff --git a/ffmpeg.c b/ffmpeg.c
> > index b95addd277..1d248bc269 100644
> > --- a/ffmpeg.c
> > +++ b/ffmpeg.c
> > @@ -2223,14 +2223,14 @@ static int ifilter_send_frame(InputFilter
> > *ifilter, AVFrame *frame)
> > return 0;
> > }
> >
> > -static int ifilter_send_eof(InputFilter *ifilter)
> > +static int ifilter_send_eof(InputFilter *ifilter, int64_t pts)
> > {
> > int i, j, ret;
> >
> > ifilter->eof = 1;
> >
> > if (ifilter->filter) {
> > - ret = av_buffersrc_add_frame_flags(ifilter->filter, NULL,
> > AV_BUFFERSRC_FLAG_PUSH);
> > + ret = av_buffersrc_close(ifilter->filter, pts,
> > AV_BUFFERSRC_FLAG_PUSH);
> > if (ret < 0)
> > return ret;
> > } else {
> > @@ -2581,8 +2581,12 @@ out:
> > static int send_filter_eof(InputStream *ist)
> > {
> > int i, ret;
> > + /* TODO keep pts also in stream time base to avoid converting back
> */
> > + int64_t pts = av_rescale_q_rnd(ist->pts, AV_TIME_BASE_Q,
> > ist->st->time_base,
> > + AV_ROUND_NEAR_INF |
> > AV_ROUND_PASS_MINMAX);
> > +
> > for (i = 0; i < ist->nb_filters; i++) {
> > - ret = ifilter_send_eof(ist->filters[i]);
> > + ret = ifilter_send_eof(ist->filters[i], pts);
> > if (ret < 0)
> > return ret;
> > }
> >
>
> The sended pts always seems to refer to the input time base.
> When a filter changes the time base, the EOF pts becomes wrong for
> subsequent filters in the chain.
> E.g. when using vf_fps behind vf_yadif=1 with interlaced input, the sended
> EOF pts is only half of the expected pts.
>
> I tried to find a solution, but without success.
> Do you have an idea?
>
> Regards,
> Thomas
>
>
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