[mythtv] crash in PreviewGenerator in VideoBuffers::DeleteBuffers

[Robert Tsai]

The preview generator in the "Watch Recordings" screen doesn't like my
new recordings of FOX "Prison Break" and "24". However, playing them
back appears fine so far. I can test patches if necessary.

[rtsai at myth:/media/myth/recordedtv]
(10:23pm) mythbackend --version
Library API version: 0.19.20060331-1
Source code version: 9619M
Options compiled in:
 linux debug using_oss using_alsa using_dvb using_x11 using_xv using_xrandr using_frontend using_backend

[rtsai at myth:/media/myth/recordedtv]
(10:27pm) mythfrontend --version
Library API version: 0.19.20060331-1
Source code version: 9619M
Options compiled in:
 linux debug using_oss using_alsa using_dvb using_x11 using_xv using_xrandr using_frontend using_backend

I don't think my local changes should have any effect on this:

	http://svn.mythtv.org/trac/ticket/690

Here is the backtrace:

(gdb) bt
#0  0x00002b65f5a5913d in raise () from /lib/libc.so.6
#1  0x00002b65f5a5a86e in abort () from /lib/libc.so.6
#2  0x00002b65f5a8dc21 in __fsetlocking () from /lib/libc.so.6
#3  0x00002b65f5a9382e in malloc_trim () from /lib/libc.so.6
#4  0x00002b65f5a93b76 in free () from /lib/libc.so.6
#5  0x00002b65f2fa6559 in av_free (ptr=0x7a3c) at mem.c:132
#6  0x00002b65f26370e4 in VideoBuffers::DeleteBuffers (this=0x1e41ef8)
    at videobuffers.cpp:1216
#7  0x00002b65f2635e0a in VideoOutputNull::InputChanged (this=0x1e41e00,
    width=1280, height=720, aspect=1.77777779) at videoout_null.cpp:54
#8  0x00002b65f25a020c in NuppelVideoPlayer::ReinitVideo (this=0x1e7b890)
    at NuppelVideoPlayer.cpp:552
#9  0x00002b65f25a076d in NuppelVideoPlayer::SetVideoParams (this=0x1e7b890,
    width=1280, height=720, fps=59.940059661865234, keyframedistance=1,
    aspect=1.77777779, scan=kScan_Detect) at NuppelVideoPlayer.cpp:827
#10 0x00002b65f25d0671 in AvFormatDecoder::MpegPreProcessPkt (this=0x9f1410,
    stream=0x1e2f1a0, pkt=0x1db6e50) at avformatdecoder.cpp:1827
#11 0x00002b65f25d9746 in AvFormatDecoder::GetFrame (this=0x9f1410,
    onlyvideo=1) at avformatdecoder.cpp:2554
#12 0x00002b65f2591854 in NuppelVideoPlayer::GetFrameNormal (this=0x1e7b890,
    onlyvideo=1) at NuppelVideoPlayer.cpp:1149
#13 0x00002b65f25924ac in NuppelVideoPlayer::GetFrame (this=0x1e7b890,
    onlyvideo=1, unsafe=false) at NuppelVideoPlayer.cpp:1227
#14 0x00002b65f25a66ac in NuppelVideoPlayer::GetScreenGrab (this=0x1e7b890,
    secondsin=64, bufflen=@0x41093000, vw=@0x41093008, vh=@0x41093004,
    ar=@0x4109300c) at NuppelVideoPlayer.cpp:4735
#15 0x00002b65f24b24bc in PreviewGenerator::GetScreenGrab (pginfo=0x1dc7e68,
    filename=@0x1dc7ec8, secondsin=64, bufferlen=@0x41093000,
    video_width=@0x41093008, video_height=@0x41093004,
    video_aspect=@0x4109300c) at previewgenerator.cpp:391
#16 0x00002b65f24b2a3c in PreviewGenerator::LocalPreviewRun (this=0x1dc7e00)
    at previewgenerator.cpp:287
#17 0x00002b65f24b2e03 in PreviewGenerator::Run (this=0x1dc7e00)
    at previewgenerator.cpp:158
#18 0x00002b65f24b3080 in PreviewGenerator::PreviewRun (param=0x1dc7e00)
    at previewgenerator.cpp:175
#19 0x00002b65f547e12a in start_thread () from /lib/libpthread.so.0
#20 0x00002b65f5af13c3 in clone () from /lib/libc.so.6

(gdb) f 6
#6  0x00002b65f26370e4 in VideoBuffers::DeleteBuffers (this=0x1e41ef8)
    at videobuffers.cpp:1216
1216            av_free(allocated_arrays[i]);

(gdb) l
1211        for (uint i = 0; i < allocated_structs.size(); i++)
1212            delete allocated_structs[i];
1213        allocated_structs.clear();
1214
1215        for (uint i = 0; i < allocated_arrays.size(); i++)
1216            av_free(allocated_arrays[i]);
1217        allocated_arrays.clear();
1218    #ifdef USING_XVMC
1219        xvmc_surf_to_frame.clear();
1220    #endif

(gdb) p i
$6 = 1

(gdb) p allocated_arrays[i]
$7 = (
    unsigned char *&) @0x1e30438: 0x2aaaae2df010 '\001' <repeats 200 times>...

--Rob
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