Ticket #12318: 20171108_#12318_stutter.patch

mythtv/libs/libmythtv/mythplayer.cpp

@@ -154 +154 @@
       fftime(0),
       // Playback misc.
       videobuf_retries(0),          framesPlayed(0),
+      prebufferFramesPlayed(0),
       framesPlayedExtra(0),
       totalFrames(0),               totalLength(0),
       totalDuration(0),
@@ -2208 +2209 @@
                             videoOutput->EnoughDecodedFrames())))
     {
         SetBuffering(true);
+        // This pece of code is to address the problem when starting
+        // Live TV of jerking and stuttering. Without this code
+        // that could go on forever, but is ured by a pause and play.
+        // This code inserts a bried pause and play when the potential
+        // for the jerking is detected.
+        if (prebufferFramesPlayed != framesPlayed)
+        {
+            float current   = ComputeSecs(framesPlayed, true);
+            float length    = ComputeSecs(totalFrames, true);
+            if (prebufferFramesPlayed != framesPlayed
+                && length > current && length - current < 1.5)
+            {
+                LOG(VB_PLAYBACK, LOG_NOTICE, LOC +
+                    QString("Pause to allow live tv catch up. Position in sec. Current: %2, Total: %3")
+                    .arg(current).arg(length));
+                if (!audio.IsPaused())
+                {
+                    audio.Pause(true);
+                    avsync_audiopaused = true;
+                }
+                prebufferFramesPlayed = framesPlayed;
+            }
+        }
         usleep(frame_interval >> 3);
         int waited_for = buffering_start.msecsTo(QTime::currentTime());
         int last_msg = buffering_last_msg.msecsTo(QTime::currentTime());

mythtv/libs/libmythtv/mythplayer.h

@@ -695 +695 @@
     /// How often we have tried to wait for a video output buffer and failed
     int       videobuf_retries;
     uint64_t  framesPlayed;
+    uint64_t  prebufferFramesPlayed;
     // "Fake" frame counter for when the container frame rate doesn't
     // match the stream frame rate.
     uint64_t  framesPlayedExtra;