[GEM-dev] [pix_record] doesn't capture background colour if codec 33 (h.264) is selected

[IOhannes m zmoelnig]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

On 2013-12-18 10:35, Antonio Roberts wrote:
> I've noticed a strange bug in GEM (or ffmpeg) whereby the
> background colour, set by [gemwin], isn't captured with
> [pix_record] if codec 33 is selected. For me this codec is listed
> as "x264 H.264 (MPEG4 AVC) encoder"
> 
> See the attached patch for an example. I'm capturing both video
> and pictures to show that it's a specific problem with [pix_record]
> and not with [gemwin]
> 
> Is there any way around this or how to fix it?

hard to tell.

i tried reproducing your problem but couldn't (i think).
i've uploaded the the (movie) output of your patch to [1].

the square and the background are not really in sync (so you sometimes
see the square), which i think is an artifact of double rendering.

i had to install the "x264" package (version
2:0.133.2339+git585324f-2+b1 on debian) for x264 support.
please also note that debian does not ship ffmpeg but instead uses
libav, and i have forgotten how libquicktime (which is the actual
framework Gem uses for recording) interact (or not) with ffmpeg/libav
to access the x264 codec....

and i had to run the entire thing within gdb, else it would crash (for
whatever reasons it does not crash when run in gdb...)


fgmasdr
IOhannes


[1] http://iem.at/~zmoelnig/tmp/gem_x264.mov
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.15 (GNU/Linux)
Comment: Using GnuPG with Icedove - http://www.enigmail.net/
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=qNPI
-----END PGP SIGNATURE-----