Hardware Accelerated GStreamer on Raspberry Pi 2

[Samuel Hurst]

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Hi, me again...

It turns out that gst-omx doesn't like the video resolution of a
running stream changing while it's running. This is a bit of a problem
for adaptive streaming like MPEG-DASH. When you run an MPEG-DASH
stream that contains only a single video representation, the stream
will play back fine:

$ gst-launch-1.0 playbin
uri="http://rdmedia.bbc.co.uk/dash/ondemand/bbb/2/client_manifest-v4-a4.
mpd"

However, if you run a stream that contains multiple video
representations, the moment that dashdemux attempts to switch up
representations to a higher bitrate it fails:

$ gst-launch-1.0 playbin
uri="http://rdmedia.bbc.co.uk/dash/ondemand/bbb/2/client_manifest-common
_init.mpd"
[...]
ERROR: from element
/GstPlayBin:playbin0/GstURIDecodeBin:uridecodebin0/GstDecodeBin:decodebi
n0/GstOMXH264Dec-omxh264dec:omxh264dec-omxh264dec0:
Could not configure supporting library.
Additional debug info:
gstomxvideodec.c(1605): gst_omx_video_dec_loop ():
/GstPlayBin:playbin0/GstURIDecodeBin:uridecodebin0/GstDecodeBin:decodebi
n0/GstOMXH264Dec-omxh264dec:omxh264dec-omxh264dec0:
Unable to reconfigure output port

This seems related to an old GStreamer bug #710948 where the decoder
would fail to recover on an MPEG2 stream changing aspect ratio. I'm
running gst-omx 1.2.0 which should include the work that Sebastian did
(I'm seeing no reversions in git) and I don't see any reason in the
patches that means it should only work for MPEG2 and not H.264. Is
this a regression, or another bug? I can raise a bugzilla ticket for
it if it turns out to be that way.

I've attached the debug log with GST_DEBUG="omx:6,omxvideodec:6" if it
helps.

Cheers,
Sam
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