[mythtv-commits] Ticket #12655: The Nuppel Video Recorder crashes with an arithmetic exception when starting to record video

[MythTV]

#12655: The Nuppel Video Recorder crashes with an arithmetic exception when
starting to record video
-------------------------------------------------+-------------------------
 Reporter:  William L. DeRieux IV                |          Owner:
  <williamderieux@…>                             |  jyavenard
     Type:  Bug Report - Crash                   |         Status:  new
 Priority:  critical                             |      Milestone:  0.28.1
Component:  MythTV - Recording                   |        Version:  0.28
 Severity:  high                                 |     Resolution:
 Keywords:                                       |  Ticket locked:  0
-------------------------------------------------+-------------------------

Comment (by William L. DeRieux IV <williamderieux@…>):

 Replying to [ticket:12655 William L. DeRieux IV <williamderieux@…>]:
 > In the fixes/0.28 branch:
 >
 https://github.com/MythTV/mythtv/commit/2422624fce51e4c0002af631cfbdf75105003fc9
 >
 > When starting a recording (either scheduled/livetv/etc)
 > Mythbackend crashes with an arithmetic exception.
 >
 > This is the backtrace:
 >
 > {{{
 > Program received signal SIGFPE, Arithmetic exception.
 > [Switching to Thread 0x7fffd12b8700 (LWP 4330)]
 > 0x00007ffff53f724c in NuppelVideoRecorder::InitBuffers
 (this=0x7fffc40408a0)
 >     at recorders/NuppelVideoRecorder.cpp:944
 > 944       video_buffer_count = (videomegs * 1000 * 1000) /
 video_buffer_size;
 > (gdb) bt
 > #0  0x00007ffff53f724c in NuppelVideoRecorder::InitBuffers
 (this=0x7fffc40408a0)
 >     at recorders/NuppelVideoRecorder.cpp:944
 > #1  0x00007ffff53f55c4 in NuppelVideoRecorder::Initialize
 (this=0x7fffc40408a0)
 >     at recorders/NuppelVideoRecorder.cpp:764
 > #2  0x00007ffff53b7e3e in TVRec::TuningNewRecorder (this=0x94cdd0,
 streamData=0x0) at tv_rec.cpp:4233
 > #3  0x00007ffff53aef74 in TVRec::HandleTuning (this=0x94cdd0) at
 tv_rec.cpp:3509
 > #4  0x00007ffff539a591 in TVRec::run (this=0x94cdd0) at tv_rec.cpp:1315
 > #5  0x00007ffff4497ea0 in MThread::run (this=0x94d050) at
 mthread.cpp:319
 > #6  0x00007ffff4498775 in MThreadInternal::run (this=0x917e60) at
 mthread.cpp:79
 > #7  0x00007fffea585d2e in ?? () from /usr/lib/x86_64-linux-
 gnu/libQt5Core.so.5
 > #8  0x00007fffea2d40a4 in start_thread (arg=0x7fffd12b8700) at
 pthread_create.c:309
 > #9  0x00007fffe97e787d in clone () at
 ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
 > }}}

 maybe a duplicate of this bug: https://code.mythtv.org/trac/ticket/12622


 2016-02-19 22:51:16.758508 E  RecBase[1](/dev/video0):
 SetIntOption(...width): Option not in profile.
 2016-02-19 22:51:16.758523 E  RecBase[1](/dev/video0):
 SetIntOption(...height): Option not in profile.

 void NuppelVideoRecorder::InitBuffers(void)
 -- w_out/h_out are 0 and causes video_buffer_size to be 0 (due to missing
 width/height in profile)
    this is the root cause of the arithmetic exception (or divide by zero)

 {{{
 void NuppelVideoRecorder::InitBuffers(void)
 {
     int videomegs;
     int audiomegs = 2;

     if (!video_buffer_size)
     {
         if (picture_format == PIX_FMT_YUV422P)
             video_buffer_size = w_out * h_out * 2;
         else
             video_buffer_size = w_out * h_out * 3 / 2;
     }

     if (width >= 480 || height > 288)
         videomegs = 20;
     else
         videomegs = 12;

     video_buffer_count = (videomegs * 1000 * 1000) / video_buffer_size;
 }}}

--
Ticket URL: <https://code.mythtv.org/trac/ticket/12655#comment:1>
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