[FFmpeg-devel] [RFC] QSV support clarifications

[Ivan Uskov]

Hello Stefano,

Monday, October 12, 2015, 9:10:04 PM, you wrote:
SS> 2. The mfx_dispatch library compiles fine on my system, but then I
SS> wonder how it is supposed to reference the Intel Media library:
SS> https://software.intel.com/en-us/intel-media-server-studio

SS> ...

SS> I'm able to compile FFmpeg with --enable-libmfx after installing
SS> the mfx_dispatch library, and run this command:
SS> ffmpeg -i test.mp4 -c:v h264_qsv -y test.out.mp4

SS> but then it fails with:
SS> Error initializing an internal MFX session
As far as I understanding Intel's libraries and patches from Media SDK should
be  present  in a system.
The  open-source mfx dispatch library is just wrapper which loads appropriate
.so by intel.
The official instruction how to setup intel media sdk
on linux is following: https://software.intel.com/sites/default/files/media_server_studio_getting_started_guide.pdf

 SS> Running strace on the command it results that it's looking for the
SS> libmfxsw64.so library and failing:
SS> open("/lib/x86_64-linux-gnu/libmfxsw64.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
SS> open("/usr/lib/x86_64-linux-gnu/libmfxsw64.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
SS> open("/lib/libmfxsw64.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
SS> open("/usr/lib/libmfxsw64.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
SS> munmap(0x7f9a55072000, 155122)          = 0
Intel's library usually locates into the
/opt/intel/mediasdk/lib64
For example for Media SDK 1.16 here following files should be:
-rwxr-xr-x. 1 root root 28826704 Jun 11 08:44 iHD_drv_video.so
-rwxr-xr-x. 1 root root 10646952 Jun 11 08:44 libmfxhw64-p.so.1.16
lrwxrwxrwx. 1 root root       20 Jul 10 16:52 libmfxhw64.so -> libmfxhw64-p.so.1.16
-rwxr-xr-x. 1 root root  9364712 Jun 11 08:44 libmfxsw64-p.so.1.16
lrwxrwxrwx. 1 root root       20 Jul 10 16:52 libmfxsw64.so -> libmfxsw64-p.so.1.16


-- 
Best regards,
 Ivan                            mailto:ivan.uskov at nablet.com