Ticket #12196: mythtv_fix_avf_bitrate.2.patch

mythtv/libs/libmythtv/avformatdecoder.cpp

@@ -90 +90 @@
 #define LOC QString("AFD: ")
 
 #define MAX_AC3_FRAME_SIZE 6144
+#define MAX_AVF_BIT_RATE 100000000U
 
 static const float eps = 1E-5;
 
@@ -2506 +2507 @@
         }
     }
 
+    //If AVF uses PTS to calculate duration (and consequently bitrate)
+    //and there are glitches in the recording that reset the PTS near
+    //the end of the recording, the bitrate provided in ic->bit_rate
+    //will be much much higher than the actual bitrate of the recording.
+    //
+    //This can cause problems with the RingBuffer because the fill_min
+    //value will be set to a value larger than the buffer can hold, which
+    //will cause reads to never be allowed.
     if (ic && ((uint)ic->bit_rate > bitrate))
-        bitrate = (uint)ic->bit_rate;
+        bitrate = min((uint)ic->bit_rate,MAX_AVF_BIT_RATE);
 
     if (bitrate > 0)
     {