ffdec: disable interpolation when dropping frames

When we are dropping frames because of QoS disable the DTS interpolation because
we won't be able to update the timestamps and end up setting the wrong
timestamps. Instead, simply use the timestamps from ffmpeg.

1 files changed, 8 insertions, 0 deletions

diff --git a/ext/ffmpeg/gstffmpegdec.c b/ext/ffmpeg/gstffmpegdec.c
index 2478462..f8345f0 100644
--- a/ext/ffmpeg/gstffmpegdec.c
+++ b/ext/ffmpeg/gstffmpegdec.c
@@ -1683,6 +1683,14 @@ gst_ffmpegdec_video_frame (GstFFMpegDec * ffmpegdec,
   if (len < 0 && (mode_switch || ffmpegdec->context->hurry_up))
     len = 0;
 
+  if (len > 0 && have_data <= 0 && (mode_switch
+          || ffmpegdec->context->hurry_up)) {
+    /* we consumed some bytes but nothing decoded and we are skipping frames,
+     * disable the interpollation of DTS timestamps */
+    ffmpegdec->ts_is_dts = FALSE;
+    ffmpegdec->last_out = -1;
+  }
+
   /* no data, we're done */
   if (len < 0 || have_data <= 0)
     goto beach;