This allow adding rtmpsink after the flv streaming have started. Otherwise,
FLV streamheader is never sent to the server, which cannot figure-out
what is this stream about. It should also help in certain renegotiation
figures. The sink will no longer work without an streamheader in caps,
though there is no known implementation of flvdemux that does not
support this.
https://bugzilla.gnome.org/show_bug.cgi?id=760242
Avoids an unlikely crash.
Arguably, if allocation fails we have no chance of
recovering but nonetheless, RTMP_Alloc can fail and
librtmp's RTMP_init() (called next) assumes a non-NULL
pointer is passed without checking.
Additionally, unify exit path on error.
rename gst-launch --> gst-launch-1.0
replace old elements with new elements(ffmpegcolorspace -> videoconvert, ffenc_** -> avenc_**)
fix caps in examples
https://bugzilla.gnome.org/show_bug.cgi?id=759432
In gst_rtmp_sink_uri_set_uri(), a test is performed in order
to be sure uri is correct for librtmp. This test calls
RTMP_ParseURL with 3 AVal pointers as parameters: host,
playpath and app.
AVal is a struct with a char* + int. After RTMP_ParseURL call,
host.av_val and app.av_val both refer a substring of "uri". But
playpath.av_val may be the result of a malloc so it needs to
be freed.
https://bugzilla.gnome.org/show_bug.cgi?id=681459
