fftools/ffmpeg: add a live mux modelive

Track the wallclock time at which each input packet is demuxed and
propagate it through decoding and encoding.
When the live mux option is used, drop all packets demuxed before the
muxer is opened. This is intended to avoid latency when opening the
muxer takes a long time.

1 files changed, 2 insertions, 0 deletions

diff --git a/fftools/ffmpeg_demux.c b/fftools/ffmpeg_demux.c
index d15cee614d..01fd19f199 100644
--- a/fftools/ffmpeg_demux.c
+++ b/fftools/ffmpeg_demux.c
@@ -176,6 +176,8 @@ static void *input_thread(void *arg)
             }
         }
 
+        pkt->opaque = (void*)av_gettime_relative();
+
         msg.pkt = av_packet_alloc();
         if (!msg.pkt) {
             av_packet_unref(pkt);