Do a small hack in Futatabi to make sure that Nageru gets the subtitles in time.

diff --git a/futatabi/video_stream.cpp b/futatabi/video_stream.cpp
index 745da27486971b13414549033b3270fa00a37174..59ab8bfc936d989e9ebc7b2250788c69a8a84df4 100644 (file)
--- a/futatabi/video_stream.cpp
+++ b/futatabi/video_stream.cpp
@@ -615,6 +615,20 @@ void VideoStream::encode_thread_func()
                        frame_queue.pop_front();
                }
 
+               // Hack: We mux the subtitle packet one time unit before the actual frame,
+               // so that Nageru is sure to get it first.
+               if (!qf.subtitle.empty()) {
+                       AVPacket pkt;
+                       av_init_packet(&pkt);
+                       pkt.stream_index = mux->get_subtitle_stream_idx();
+                       assert(pkt.stream_index != -1);
+                       pkt.data = (uint8_t *)qf.subtitle.data();
+                       pkt.size = qf.subtitle.size();
+                       pkt.flags = 0;
+                       pkt.duration = lrint(TIMEBASE / global_flags.output_framerate);  // Doesn't really matter for Nageru.
+                       mux->add_packet(pkt, qf.output_pts - 1, qf.output_pts - 1);
+               }
+
                if (qf.type == QueuedFrame::ORIGINAL) {
                        // Send the JPEG frame on, unchanged.
                        string jpeg = frame_reader.read_frame(qf.frame1);
@@ -681,19 +695,6 @@ void VideoStream::encode_thread_func()
                } else {
                        assert(false);
                }
-
-               if (!qf.subtitle.empty()) {
-                       AVPacket pkt;
-                       av_init_packet(&pkt);
-                       pkt.stream_index = mux->get_subtitle_stream_idx();
-                       assert(pkt.stream_index != -1);
-                       pkt.data = (uint8_t *)qf.subtitle.data();
-                       pkt.size = qf.subtitle.size();
-                       pkt.flags = 0;
-                       pkt.duration = lrint(TIMEBASE / global_flags.output_framerate);  // Doesn't really matter for Nageru.
-                       mux->add_packet(pkt, qf.output_pts, qf.output_pts);
-               }
-
                if (qf.display_func != nullptr) {
                        qf.display_func();
                }