[FFmpeg-trac] #3515(undetermined:new): Crashes or artifacts when playing a specific file/stream
FFmpeg
trac at avcodec.org
Mon Mar 31 21:49:57 CEST 2014
#3515: Crashes or artifacts when playing a specific file/stream
-------------------------------------+-------------------------------------
Reporter: evol | Type: defect
Status: new | Priority: normal
Component: | Version:
undetermined | unspecified
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Trying to stream http://s3.amazonaws.com/ffmpeg-testing/badaccess.mp4
using Chromium or VLC results in artifacts and/or crashes.
Why am I submitting this bug report here? Both apps' video playing
capabilities are powered by ffmpeg, so I think that the issue lies here
somewhere.
The problem is, I cannot reproduce this problem using just ffmpeg/ffplay.
In addition to that, other videos encoded using the same software and
settings are played back properly in all players, so I think that's not an
issue with the video.
I tested several configurations of players and operating systems while
trying to play both the stream and the downloaded file. These are my
results:
|| ||= Local file =||= Stream =||
||= Chrome 33 / OS X =|| crashes tab || crashes tab ||
||= Chromium git-3ca16748 / OS X =|| crashes tab || crashes tab ||
||= Chrome 33 / Windows (Native) =|| works || works ||
||= Chrome 33 / Windows (VM on OS X) =|| crashes tab || crashes tab ||
||= Chrome 33 / Linux =|| not tested || sometimes plays with artifacts,
sometimes crashes ||
||= VLC 2.1.4 / OS X =|| crashes || plays with artifacts, then crashes
whole system ||
||= VLC 2.1.3 / Windows =|| crashes || crashes ||
||= ffplay git-31c21d2f =|| works || works (low framerate) ||
||= QuickTime / OS X =|| works || works ||
||= Firefox 28 / OS X =|| works || works ||
||= Safari 7.0.2 / OS X =|| works || works ||
I've managed to attach lldb to the Chromium tab process twice. One time
I've got (sorry for not saving much information):
{{{
* thread #11: tid = 0x7eb97, 0x213cc453
ffmpegsumo.so`ff_put_h264_chroma_mc8_rnd_ssse3 + 67, stop reason =
EXC_BAD_ACCESS (code=1, address=0x23c58160)
}}}
The other time I've got:
{{{
* thread #16: tid = 0x24989, 0x213eb082
ffmpegsumo.so`ff_pred8x8_vertical_8_mmx + 50, stop reason = EXC_BAD_ACCESS
(code=1, address=0x22283160)
frame #0: 0x213eb082 ffmpegsumo.so`ff_pred8x8_vertical_8_mmx + 50
ffmpegsumo.so`ff_pred8x8_vertical_8_mmx + 50:
-> 0x213eb082: movq %mm0, (%eax,%ecx,2)
0x213eb086: ret
0x213eb087: jmp 0x213eb090 ;
ff_pred8x8_horizontal_8_mmx
0x213eb089: nop
(lldb) bt
* thread #16: tid = 0x24989, 0x213eb082
ffmpegsumo.so`ff_pred8x8_vertical_8_mmx + 50, stop reason = EXC_BAD_ACCESS
(code=1, address=0x22283160)
* frame #0: 0x213eb082 ffmpegsumo.so`ff_pred8x8_vertical_8_mmx + 50
frame #1: 0x21264bdf
ffmpegsumo.so`hl_decode_mb_simple_8(h=<unavailable>) + 1663 at
h264_mb_template.c:162
frame #2: 0x2126ceb6 ffmpegsumo.so`decode_slice(avctx=<unavailable>,
arg=0xb0080db4) + 406 at h264.c:4485
frame #3: 0x2126cbf2 ffmpegsumo.so`execute_decode_slices(h=0x24be0000,
context_count=<unavailable>) + 82 at h264.c:4636
frame #4: 0x2125a8ce ffmpegsumo.so`decode_nal_units(h=<unavailable>,
buf=<unavailable>, buf_size=2118106720, parse_extradata=<unavailable>) +
2046 at h264.c:4999
frame #5: 0x21268124 ffmpegsumo.so`decode_frame(avctx=<unavailable>,
data=<unavailable>, got_frame=<unavailable>, avpkt=0x7e3fbebc) + 324 at
h264.c:5136
frame #6: 0x213533dc ffmpegsumo.so`frame_worker_thread(arg=0x7e3fbe00)
+ 492 at pthread_frame.c:153
frame #7: 0x907bb5fb libsystem_pthread.dylib`_pthread_body + 144
}}}
I couldn't get more crash dumps out of Chromium, because suddenly the tabs
started to close with status 0 without any crash reports that could be
handled by lldb. :(
Also, I'd like to note that the local file VLC crash was also because of a
EXC_BAD_ACCESS.
How to reproduce:
Open http://s3.amazonaws.com/ffmpeg-testing/badaccess.mp4 using Chromium,
Chrome or VLC.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/3515>
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