Temporary patch for FFMpeg 3.4 APIs.

gstreamer1-libav-temp-ffmpeg-3.4-api.patch

@@ -0,0 +1,25 @@
+--- gst-libav-1.12.3.orig/ext/libav/gstavviddec.c	2017-08-10 17:56:34.000000000 +0200
++++ gst-libav-1.12.3.orig/ext/libav/gstavviddec.c	2017-11-04 21:48:00.784354386 +0100
+@@ -1525,8 +1525,20 @@ 
+    * See https://bugzilla.gnome.org/show_bug.cgi?id=726020
+    */
+   GST_VIDEO_DECODER_STREAM_UNLOCK (ffmpegdec);
+-  len = avcodec_decode_video2 (ffmpegdec->context,
+-      ffmpegdec->picture, have_data, &packet);
++  *have_data = 0;
++  if (size > 0) {
++    len = avcodec_send_packet(ffmpegdec->context, &packet);
++    if (len == AVERROR(EAGAIN)) {
++      len = 0;
++    } else {
++      len = size;
++    }
++    if (len >= 0) {
++      int result = avcodec_receive_frame(ffmpegdec->context, ffmpegdec->picture);
++      if (result == 0)
++        *have_data = 1;
++    }
++  }
+   GST_VIDEO_DECODER_STREAM_LOCK (ffmpegdec);
+ 
+   GST_DEBUG_OBJECT (ffmpegdec, "after decode: len %d, have_data %d",

gstreamer1-libav.spec

@@ -1,12 +1,15 @@
 Name:           gstreamer1-libav
 Version:        1.12.3
-Release:        2%{?dist}
+Release:        3%{?dist}
 Summary:        GStreamer 1.0 libav-based plug-ins
 Group:          Applications/Multimedia
 License:        LGPLv2+
 URL:            http://gstreamer.freedesktop.org/
 Source0:        http://gstreamer.freedesktop.org/src/gst-libav/gst-libav-%{version}.tar.xz
 Patch0:         gst-ffmpeg-0.10.12-ChangeLog-UTF-8.patch
+%if 0%{?fedora} > 27 || 0%{?rhel} > 8
+Patch1:         %{name}-temp-ffmpeg-3.4-api.patch
+%endif
 BuildRequires:  gstreamer1-devel >= %{version}
 BuildRequires:  gstreamer1-plugins-base-devel >= %{version}
 BuildRequires:  orc-devel
@@ -43,7 +46,7 @@ plug-in.
 
 
 %prep
-%autosetup -n gst-libav-%{version}
+%autosetup -p1 -n gst-libav-%{version}
 
 
 %build
@@ -72,6 +75,9 @@ rm %{buildroot}%{_libdir}/gstreamer-1.0/libgst*.la
 
 
 %changelog
+* Sat Nov 18 2017 Simone Caronni <negativo17@gmail.com> - 1.12.3-3
+- Temporary patch for FFMpeg 3.4 APIs.
+
 * Mon Oct 16 2017 Leigh Scott <leigh123linux@googlemail.com> - 1.12.3-2
 - Rebuild for ffmpeg update