Re: [FFmpeg-devel] QSV dynamically linked on linux

[Ivan Uskov]

Hello Julien,

Thursday, October 15, 2015, 7:08:10 PM, you wrote:

JF> Hi all,

JF> I'm using QuickSync and FFmpeg on linux.
JF> It works well for encoding and decoding when I build it with
JF> --enable-static.

JF> But when I build it with --enable-shared, it hangs.
JF> So my question is: is it supposed to work when dynamically linked?
As  far as I understanding, here only libmfx library can be the reason of the
issue. Possible libmfx was compiled without -fPIC flag.
There are two source of libmfx possible, original Intel distributive and
mfx_dispatch project: https://github.com/lu-zero/mfx_dispatch
For  both  cases  libmfx  delivers  in sources so you can double-check how it
compiles, and try to recompile libmfx with forced -fPIC compiler option.
In general linker should to reject libs compiled without position-independent
code option so the  reason may be more deep and complex but -fPIC is first what
necessary to check.


-- 
Best regards,
 Ivanmailto:ivan.us...@nablet.com

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[FFmpeg-devel] QSV dynamically linked on linux

[Julien Fond]

On Fri, Oct 16, 2015 at 12:10 PM, Ivan Uskov  wrote:

> Hello Julien,
>
> Thursday, October 15, 2015, 7:08:10 PM, you wrote:
>
> JF> Hi all,
>
> JF> I'm using QuickSync and FFmpeg on linux.
> JF> It works well for encoding and decoding when I build it with
> JF> --enable-static.
>
> JF> But when I build it with --enable-shared, it hangs.
> JF> So my question is: is it supposed to work when dynamically linked?
> As  far as I understanding, here only libmfx library can be the reason of
> the
> issue. Possible libmfx was compiled without -fPIC flag.
> There are two source of libmfx possible, original Intel distributive and
> mfx_dispatch project: https://github.com/lu-zero/mfx_dispatch
> For  both  cases  libmfx  delivers  in sources so you can double-check how
> it
> compiles, and try to recompile libmfx with forced -fPIC compiler option.
> In general linker should to reject libs compiled without
> position-independent
> code option so the  reason may be more deep and complex but -fPIC is first
> what
> necessary to check.
>
>
> --
> Best regards,
>  Ivanmailto:ivan.us...@nablet.com
>
>
​Thanks Ivan. You're right, it works when I compile the mfx_dispatch
project with:
--enable-static --disable-shared --with-pic​

Regards,
Julien
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[FFmpeg-devel] QSV dynamically linked on linux

[Julien Fond]

Hi all,

I'm using QuickSync and FFmpeg on linux.
It works well for encoding and decoding when I build it with
--enable-static.

But when I build it with --enable-shared, it hangs.
So my question is: is it supposed to work when dynamically linked?

Thanks in advance,
Julien
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