ffmpeg: add last_mux_dts_plus_duration

Fixes 1 frame error in the duration and derived values,
introduced by not using AVStream.pts in the previous commit

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 1 insertions, 0 deletions

diff --git a/ffmpeg_opt.c b/ffmpeg_opt.c
index 8e3873c807..6f45785192 100644
--- a/ffmpeg_opt.c
+++ b/ffmpeg_opt.c
@@ -1152,6 +1152,7 @@ static OutputStream *new_output_stream(OptionsContext *o, AVFormatContext *oc, e
         input_streams[source_index]->st->discard = AVDISCARD_NONE;
     }
     ost->last_mux_dts = AV_NOPTS_VALUE;
+    ost->last_mux_dts_plus_duration = AV_NOPTS_VALUE;
 
     return ost;
 }