[OpenIndiana-discuss] Fwd: Comments, please! problem with ffmpeg that seems to be a problem with OI at driver or basic library level
Hans J. Albertsson
hans.j.albertsson at branneriet.se
Wed May 22 15:16:09 UTC 2013
(The below is a conversation between me and a former colleague from Sun)
Published here in an anonymous form.
--------
This is what I got from first (by mistake) truss -T pollsys and then
(intended) truss -T poll
ff_network_wait_fd_timeout() + 8c.... What's that??? Must be in ffmpeg
somewhere, judging by its name.
hans at klaus%64%11:24> ps -fe | grep ffmpeg
hans 29998 26978 1 11:24:56 pts/6 0:14 ffmpeg -i
http://svtplay10i-f.akamaihd.net/i/se/open/20130510/1283828-004A/ENDE
hans 29961 1 0 maj 15 ? 1:04
/usr/local/bin/ffmpeg -i
http://svtplay10i-f.akamaihd.net/i/se/open/20130510/12
hans 7 22527 0 11:27:49 pts/4 0:00 grep ffmpeg
hans at klaus%65%11:27> ptree 29998
3153 /usr/sbin/gdm-binary
3668 /usr/lib/gdm-simple-slave --display-id
/org/gnome/DisplayManager/Displa
3794 /usr/lib/gdm-session-worker
3801 gnome-session
4012 gnome-terminal --sm-client-id
108f7b70c3cc7f14f013637904873352500
26978 tcsh
29998 ffmpeg -i
http://svtplay10i-f.akamaihd.net/i/se/open/20130510
hans at klaus%66%11:28> truss -T pollsys -p 29998
pollsys(0x08046798, 1, 0x08046748, 0x00000000) = 0
hans at klaus%67%11:28>
hans at klaus%67%11:28>
hans at klaus%67%11:28>
hans at klaus%67%11:28> pstack 29998
29998: ffmpeg -i
http://svtplay10i-f.akamaihd.net/i/se/open/20130510/1283828-
fef141f5 pollsys (8046798, 1, 8046748, 0)
feea4fa6 poll (8046798, 1, 64, fef01058, 5, 0) + 4c
fd2db96c ff_network_wait_fd_timeout () + 8c
hans at klaus%68%11:29>
hans at klaus%68%11:29> truss -T poll -p 29998
pollsys(0x08046798, 1, 0x08046748, 0x00000000) = 0
pollsys(0x08046798, 1, 0x08046748, 0x00000000) = 0
hans at klaus%69%11:30> pstack 29998
29998: ffmpeg -i
http://svtplay10i-f.akamaihd.net/i/se/open/20130510/1283828-
fef141f5 pollsys (8046798, 1, 8046748, 0)
feea4fa6 poll (8046798, 1, 64, fef01058, 5, 0) + 4c
fd2db96c ff_network_wait_fd_timeout () + 8c
hans at klaus%70%11:30>
On 2013-05-15 23:58, XXXXXX wrote:
> Hans,
>
> I'm currently unable to post to the list but I have seen this when the
> program is not large file aware but is linked with libraries that are
> large file aware or visa versa. The details escape me but I can check
> next week when I get home.
>
> If you do truss -T poll of the spinning program so it stops in poll
> and then run pstack against it will at least tell you where the
> problem is. That might even remind me of the problem. The solution was
> a recompile after editing a header file.
>
> Hope this helps
>
> C
>
> Begin forwarded message:
>
>> *From:* "Hans J. Albertsson" <hans.j.albertsson at branneriet.se
>> <mailto:hans.j.albertsson at branneriet.se>>
>> *Date:* 15 May 2013 10:25:08 PDT
>> *To:* Discussion list for OpenIndiana
>> <openindiana-discuss at openindiana.org
>> <mailto:openindiana-discuss at openindiana.org>>
>> *Subject:* *Re: [OpenIndiana-discuss] Comments, please! problem with
>> ffmpeg that seems to be a problem with OI at driver or basic library
>> level*
>> *Reply-To:* Discussion list for OpenIndiana
>> <openindiana-discuss at openindiana.org
>> <mailto:openindiana-discuss at openindiana.org>>
>>
>> Yes, running in debug mode seems to make it all work ok, at a slight
>> cost in speed.
>>
>> On 2013-05-15 17:43, Hans J. Albertsson wrote:
>>> One more piece of test data: upping verbosity one step (pressing '+'
>>> in the terminal running ffmpeg) made it all run to completion with
>>> minimal time penalty. Worked twice. Will test some more.
>>>
>>> That would seem to suggest a buffering/timing issue.
>>>
>>>
>>> On 2013-05-15 17:37, Colin Ellis wrote:
>>>> I'd suggest trying ffmpeg out with different encodings first to see
>>>> if it's
>>>> stream-specific. It might actually be libavcodec giving you the hang.
>>>> I've seen endless loop bugs previously while transcoding audio.
>>>>
>>>>
>>>> On Wed, May 15, 2013 at 8:52 AM, Hans J. Albertsson <
>>>> hans.j.albertsson at branneriet.se
>>>> <mailto:hans.j.albertsson at branneriet.se>> wrote:
>>>>
>>>>> I just discovered that with most Ubuntu versions and recent
>>>>> ffmpegs, the
>>>>> same hang happens there.
>>>>>
>>>>> So it isn't just OI.
>>>>>
>>>>> Good. Or bad.. Or something. I will look into it, trussing and
>>>>> whatever. I
>>>>> mean my ffmpeg is locally compiled and I have the source code for
>>>>> reference.
>>>>>
>>>>> On 2013-05-15 16:05, Bob Friesenhahn wrote:
>>>>>
>>>>>> On Wed, 15 May 2013, Hans J. Albertsson wrote:
>>>>>>
>>>>>> I regularly download ( quite legally, I'm told ) HLS streams from
>>>>>>> svtplay.se <http://svtplay.se> using ffmpeg and a stream URL
>>>>>>> obtained by scraping the
>>>>>>> svtplay.se/ <http://svtplay.se/><show-link> page.
>>>>>>>
>>>>>>> This works very well in Ubuntu and Windows on a separate PC.
>>>>>>>
>>>>>>> Under OI and even in W XP inside a VirtualBox VM it hangs,
>>>>>>> seemingly at
>>>>>>> random positions in the stream. The ffmpeg process is totally
>>>>>>> inert upon
>>>>>>> hanging, and one must kill it by two consecutive ^C. It doesn't
>>>>>>> respond to
>>>>>>> the on the fly command language at all.
>>>>>>>
>>>>>>> The hang is in pollsys, as demonstrated by the following truss
>>>>>>> -f output
>>>>>>> excerpt from the hanging ffmpeg process.
>>>>>>>
>>>>>>> 29961: pollsys(0x08046768, 1, 0x08046718, 0x00000000) = 0
>>>>>>> 29961: pollsys(0x08046768, 1, 0x08046718, 0x00000000) = 0
>>>>>>> 29961: pollsys(0x08046768, 1, 0x08046718, 0x00000000) = 0
>>>>>>> 29961: pollsys(0x08046768, 1, 0x08046718, 0x00000000) = 0
>>>>>>> 29961: pollsys(0x08046768, 1, 0x08046718, 0x00000000) = 0
>>>>>>> 29961: pollsys(0x08046768, 1, 0x08046718, 0x00000000) = 0
>>>>>>> 29961: pollsys(0x08046768, 1, 0x08046718, 0x00000000) = 0
>>>>>>> 29961: pollsys(0x08046768, 1, 0x08046718, 0x00000000) = 0
>>>>>>>
>>>>>>>
>>>>>>> I guess that the fact it happens in the W XP in vbox the same as
>>>>>>> in OI
>>>>>>> itself indicates the problem somehow involves code residing
>>>>>>> under the Vbox
>>>>>>> VM, even, and that it's some sort of incompatibility that only will
>>>>>>> actually have an effect under some sort of race or race-like
>>>>>>> condition.
>>>>>>>
>>>>>>> I'd appreciate any insight any of you could offer into what this
>>>>>>> entails
>>>>>>>
>>>>>> I see similar issues with the VLC player which decides that
>>>>>> 'mplayer' is
>>>>>> too slow and not able to keep up. Without taking time to
>>>>>> diagnose, my
>>>>>> first guess would be a buffering issue which causes the hang.
>>>>>> The software
>>>>>> is developed under Linux and may have certain buffering (e.g. pipe
>>>>>> buffering) expectations. Confusion between the buffering and any
>>>>>> locking
>>>>>> (or even just the buffering) might cause a deadlock in the software.
>>>>>>
>>>>>> To diagnose, try using 'pstack' on the processes which are
>>>>>> hanging and
>>>>>> see where they are hung.
>>>>>>
>>>>>> Bob
>>>>>>
>>>>>
>>>>> ______________________________**_________________
>>>>> OpenIndiana-discuss mailing list
>>>>> OpenIndiana-discuss@**openindiana.org
>>>>> <http://openindiana.org><OpenIndiana-discuss at openindiana.org
>>>>> <mailto:OpenIndiana-discuss at openindiana.org>>
>>>>> http://openindiana.org/**mailman/listinfo/openindiana-**discuss<http://openindiana.org/mailman/listinfo/openindiana-discuss>
>>>>> <http://openindiana.org/**mailman/listinfo/openindiana-**discuss%3Chttp://openindiana.org/mailman/listinfo/openindiana-discuss%3E>
>>>>>
>>>>>
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