[Libav-user] Segfault on corrupted video

Tim Pitman tapitman11 at gmail.com
Wed Jun 27 21:59:48 CEST 2012

After continued debugging I've narrowed things down somewhat. after
getting a picture from avcodec_decode_video2, I pass the data from the
picture to glTexImage2D, which is what
seems to be crashing. When I backtrace with gdb it says the the
address stored in picture->data[0]
is out of bounds. So I'm guessing that the unref error coming from
libavcodec isn't what's actually crashing,
but it's related. Any ideas? Can someone provide more info about what
normally causes unref short errors?


On Tue, Jun 26, 2012 at 1:57 PM, Tim Pitman <tapitman11 at gmail.com> wrote:
> After using gdb to run a backtrace it looks like my problem may be in
> my OpenGL rendering. Sorry about that.
> However, I still have one general question: When it comes to error
> detection in situations like this, is dropping corrupted data at the
> NALU level a good way to go, or is there a better way? Would I get
> much advantage from encapsulating in RTP packets?
> Thanks,
> Tim
> On Tue, Jun 26, 2012 at 1:51 PM, Tim Pitman <tapitman11 at gmail.com> wrote:
>> Ok, I did some more testing, and the problem is not reproducible with
>> either ffmpeg or ffplay. I created a dump of the corrupted video
>> stream. When I play it back through my player it crashes but ffplay
>> just throws some new errors and then stops and the end of the video.
>> Any ideas?
>> On Tue, Jun 26, 2012 at 12:35 PM, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:
>>> Tim Pitman <tapitman11 at ...> writes:
>>>> There are lots of errors but mostly they just result in
>>>> artifacts, which is exactly what I want to happen. However,
>>>> when the channel is bad libav segfaults with:
>>>> mmco: unref short failure
>>> (Crashes are always important bugs)
>>> Can you reproduce the bug with ffmpeg (instead of using your application)?
>>> Please confirm that you are using current git head from
>>> http://ffmpeg.org/download.html and please provide backtrace etc.
>>> as explained on http://ffmpeg.org/bugreports.html
>>> Carl Eugen
>>> _______________________________________________
>>> Libav-user mailing list
>>> Libav-user at ffmpeg.org
>>> http://ffmpeg.org/mailman/listinfo/libav-user

More information about the Libav-user mailing list