[FFmpeg-user] libutvideo causes Segmentation fault

Johann Rekowski johann.rekowski at googlemail.com
Sun Mar 10 19:37:15 CET 2013


On 3/10/2013 7:15 PM, Carl Eugen Hoyos wrote:
> Johann Rekowski <johann.rekowski <at> googlemail.com> writes:
>
>> libutvideo:
>> # git source: git://github.com/qyot27/libutvideo.git
>>    ./configure \
>>    --prefix=/usr \
>>    --enable-shared \
>>    --disable-static \
>>    --optlevel=3 \
>>    --enable-pic \
>>    --enable-asm=x64
> I can reproduce the crash you are seeing, removing
> "--enable-asm=x64" from the configure line works
> here.
>
> Carl Eugen
>
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Thanks for the fix, are there any plans on adding support for the asm 
optimizations in ffmpeg?

On 3/10/2013 6:59 PM, Carl Eugen Hoyos wrote:
> Johann Rekowski <johann.rekowski <at> googlemail.com> writes:
>
>> I thought that FFv1 is deprecated
> Could you elaborate? This is the first time I read this
> (and I should really know).
Wikipedia article "http://en.wikipedia.org/wiki/FFV1" states:
Latest release 
<http://en.wikipedia.org/wiki/Software_release_life_cycle> v1.1 / 
16 April 2006; *6 years ago*

And here "http://en.wikipedia.org/wiki/Snow_%28codec%29" it says:
/The two video codecs are the lossless "//FFV1 
<http://en.wikipedia.org/wiki/FFV1>//", and the lossless and lossy Snow 
codec, the development of which has *stalled*, while its bitstream 
format hasn't been finalized yet, making it experimental for now 
(February 2011), and the multimedia container is "//NUT 
<http://en.wikipedia.org/w/index.php?title=NUT_Container&action=edit&redlink=1>//" 
which is also not being actively developed anymore, but is still 
maintained./

So I thought that since development is stalled, it has become 
deprecated, sorry if I was wrong.
>> and not able to use multithreading.
> Works fine afaik...
>
> [...]
>
>> I have tried several command line options
>> (e. g. utvideo, libutvideo) but it only returns a
>> "command not found" message.
> Command line and complete, uncut console output missing.
>
> (I should add that I guess libutvideo could be
> seen as deprecated since historically, external
> libraries were always removed some time after
> native support was added.)
>
> [...]
How's that deprecated, if the last update on UtVideo was on 2013-01-13 
seen here:
http://umezawa.dyndns.info/wordpress/?p=3655
Well as far as I know, utvideo was originally designed to be a vfw codec 
for Windows...
>
>> How do I backtrace something?
> See http://ffmpeg.org/bugreports.html
>
> Carl Eugen
>
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> ffmpeg-user at ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/ffmpeg-user
Thanks, I will try my best on backtracing once I'm on my Linux PC again, 
though we now know it's the asm optimizations that caused the 
Segmentation fault.

- Johann Rekowski


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