I received two feedbacks from Fedora 22 users about the following problem:
HTML 5 videos with only sound working and black screen.
That happened using different VGA (nVidia:nouveau and Intel) and different browsers (Firefox and Konqueror).
Both users have all gstreamer plugins 0.x and 1.x installed, and now I provide gstreamer packages list and lspci of one of the two machines


gstreamer-plugins-bad-free-0.10.23-24.fc22.x86_64
gstreamer1-plugins-good-extras-1.4.5-3.fc22.x86_64
gstreamer-plugins-base-0.10.36-12.fc22.x86_64
gstreamer1-1.4.5-1.fc22.i686
gstreamer-plugins-ugly-0.10.19-18.fc22.x86_64
libnice-gstreamer1-0.1.13-1.fc22.x86_64
gstreamer-ffmpeg-0.10.13-15.fc22.x86_64
gstreamer1-plugins-bad-free-1.4.5-3.fc22.x86_64
phonon-backend-gstreamer-4.8.2-3.fc22.x86_64
gstreamer-tools-0.10.36-11.fc22.x86_64
gstreamer1-plugins-bad-freeworld-1.4.5-2.fc22.x86_64
gstreamer-0.10.36-11.fc22.x86_64
gstreamer-0.10.36-11.fc22.i686
PackageKit-gstreamer-plugin-1.0.6-6.fc22.x86_64

00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09) (prog-if 00 [VGA controller])
        Subsystem: Lenovo Device 21f7
        Flags: bus master, fast devsel, latency 0, IRQ 28
        Memory at f0000000 (64-bit, non-prefetchable) [size=4M]
        Memory at e0000000 (64-bit, prefetchable) [size=256M]
        I/O ports at 4000 [size=64]
        Expansion ROM at <unassigned> [disabled]
        Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
        Capabilities: [d0] Power Management version 2
        Capabilities: [a4] PCI Advanced Features
        Kernel driver in use: i915
        Kernel modules: i915