[Buildroot] [PATCH v3 3/4] package/ffmpeg: bump to version 4.1

[Bernd Kuhls <bernd.kuhls@t-online.de>]

Hi,

Am Wed, 06 Feb 2019 10:47:49 +0100 schrieb Thomas Petazzoni:

> Is there a stable version of gstreamer that was released and that is
> compatible with ffmpeg 4.x ? If so, that's what we want to use.

no:
https://bugzilla.gnome.org/show_bug.cgi?id=792900#c14
"I wouldn't worry about the backwards compatibility, but we would have to 
wait until 1.16 in that case. Can't be included in 1.14."

https://github.com/GStreamer/gst-libav/blob/master/NEWS
"GStreamer 1.16 has not been released yet. It is scheduled for release in
January/February 2019."

Only unstable 1.15.1 was released yet.

> If not, then presumably there are upstream GStreamer changes that make
> it compatible with ffmpeg 4.x, and we would like to see those patches
> backported rather than using home-grown patches.

No, upstream says backporting is not possible:
https://github.com/GStreamer/gst-libav/commit/
8886a016fce625e1c25a4902be4021196a6784a2#diff-
ff4e2dc4962dc25a1512353299992c8dR1400

"-   The gst-libav module in 1.14 will only build against older ffmpeg
    3.x versions and won?t build against the newly-released ffmpeg 4.0
    (as in RPM Fusion for Fedora 28) due to API changes. Use the
    internal ffmpeg copy instead if you build using autotools. This is
    fixed in git master / upcoming 1.16, but won?t be backported to the
    1.14 branch as it is rather intrusive and difficult to support both
    old and new APIs at the same time."

Regards, Bernd

PS: ffmpeg 4.1.1 was released.