Avidemux 2.5.5 FFMpeg (lav) audio encoding problem

[Hans de Goede]

Hi,

On 06/22/2011 05:56 PM, Richard Shaw wrote:
> Ok, I whoops'd and didn't notice my replies were going straight to
> Hans instead of the list so here's the short version for anyone else
> following this thread:
>
> On Tue, Jun 21, 2011 at 1:53 AM, Hans de Goede<j.w.r.degoede at gmail.com>  wrote:
>> I would make sure I've a binary compiled with debuginfo
>> installed, or install from rpm and install the
>> relevant -debuginfo packages, then run the hanging
>> program normally and once it hangs attach gdb to it
>> and see what it is doing.
>
> Yup, I installed the avidemux-debuginfo but not all the dependencies.
> I hope I don't need them as it's an extensive list.
>
> I usually run the program from gdb, but you're saying there's a way to
> attach gdb to it after the fact?
>
> On Wed, Jun 22, 2011 at 3:45 AM, Hans de Goede<j.w.r.degoede at gmail.com>  wrote:
> [SNIP]
>> I don't know how to redirect the output to file I'm afraid, although
>> I'm pretty sure there is a way ...
>
> Well, I don't know why this works but it does...
>
> I first tried:
> # gdb /usr/bin/avidemux2_qt4
> set logging on
> set logging file avidemux.log
> run
> <HANG>
> <CTL-C>
> thread apply all bt full
> quit
>
> This saved the output of avidemux but not the backtrace.
>
> Then I found a gentoo page[1] and they did things a little differently:
> # gdb /usr/bin/avidemux2_qt4
> run
> <HANG>
> <CTL-C>
> set logging on
> set logging file avidemux_bt.log
> thread apply all bt full
> set logging off
> quit
>
>
>> And see if there is anything interesting there. If you can copy paste
>> the output of that I can see if I notice anything special.
>
> http://pastebin.com/iqsBF8fj
>

Looking at the backtrace it seems the hang is deep inside the decoder,
other then that I've no clue.

> Thanks,
> Richard
>
> [1] http://www.gentoo.org/proj/en/qa/backtraces.xml
> I looked at some of the output but I didn't see anything that jumped
> out at me as wrong. There must be a way to redirect the gdb output to
> a file which may make it easier to browse through.
>
> Thanks,
> Richard
>
> Update...
>
> I don't know if you've looked at the bt yet as I've updated it twice
> now :) I installed SOME of the missing debuginfo packages (at least
> the ones that might actually be useful, like glibc). I didn't both
> with the QT ones since it's huge and the problem is limited to the AAC
> encoder so it's probably not relevant.
>
> If you look at line 360 there seems to be a typo:
>         vfPlugins = 0x16aedf0 "lugins/videoEncoder/"
>
> It looks like the P is missing but I would think that if that's the
> problem then it would mess up all the encoders, not just AAC.

Hmm, that does seem wrong. It might be something to discuss with
upstream.

Regards,

Hans