sync: fix small video dejitter error

This very small error snowballs into a crash in x264 :-p

If the amount of jitter on the first frame in the queue was small
(about 1 tick) then jitter would not be removed from that frame.
This extra tick of jitter can appear on different frames depending
on when frame arrives and how much has been queued.  This very small
amount of randomness lead to problems in the VFR filter.  A frame
duration difference as small as 1 tick can lead to an extra frame
getting duplicated when doing CFR.  When doing 2 pass encoding, this
extra frame causes x264 to crash at the end of the 2nd pass.

diff --git a/libhb/sync.c b/libhb/sync.c
index f199feff8ea21a6b40eabbd5c3ef1e4f4ad95bd1..ac30f7e28883e7150450d713999425971419ac52 100644 (file)
--- a/libhb/sync.c
+++ b/libhb/sync.c
@@ -554,6 +554,11 @@ static void dejitterVideo( sync_stream_t * stream )
     if (ABS(duration - frame_duration) < 1.1)
     {
         // Ignore small jitter
+        buf->s.start = stream->next_pts + frame_duration;
+        buf = hb_list_item(stream->in_queue, 0);
+        buf->s.start = stream->next_pts;
+        buf->s.duration = frame_duration;
+        buf->s.stop = stream->next_pts + frame_duration;
         return;
     }