[gstreamer-bugs] [Bug 607798] New: x264enc needs updating to support new features
bugzilla at gnome.org
Fri Jan 22 10:46:58 PST 2010
GStreamer | gst-plugins-ugly | git
Summary: x264enc needs updating to support new features
AssignedTo: gstreamer-bugs at lists.sourceforge.net
ReportedBy: darkshikari at gmail.com
QAContact: gstreamer-bugs at lists.sourceforge.net
GNOME target: ---
GNOME version: ---
libx264 has recently added a lot of new features, many of which are not
available in x264enc. Some examples:
1) x264 by default has a very large lookahead. This can be disabled, of
course, but x264enc doesn't currently expose the options (sync-lookahead,
rc-lookahead, sliced-threads) in order to do it.
2) x264 now supports intra-refresh, an I-frame-less encoding mode for low
latency streaming. Not only can this not be set, but it requires that
x264_picture_t->b_keyframe be used for signalling keyframes, not pic_type ==
3) A few variables that used to be booleans are now ints, e.g. b-adapt now has
3 modes (off, fast, optimal) to match ffmpeg's b-strategy, while it used to
only be "off" and "fast". These variables aren't exposed through x264enc
either; one can only set off or fast currently.
It would also be extremely useful if x264enc supported the presets and/or tune
options present in x264.c, which provide a convenient way to adjust speed and
quality settings without messing with a large number of internal options. This
would let a user set tune=zerolatency to turn off the lookaheads, as opposed to
going through 4 low-level options themselves. This is less important than
supporting the new features though.
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