[gstreamer-bugs] [Bug 634687] New: RFC: operation hints for GstElement
GStreamer (bugzilla.gnome.org)
bugzilla at gnome.org
Fri Nov 12 07:49:17 PST 2010
https://bugzilla.gnome.org/show_bug.cgi?id=634687
GStreamer | gstreamer (core) | git
Summary: RFC: operation hints for GstElement
Classification: Desktop
Product: GStreamer
Version: git
OS/Version: Linux
Status: UNCONFIRMED
Severity: enhancement
Priority: Normal
Component: gstreamer (core)
AssignedTo: gstreamer-bugs at lists.sourceforge.net
ReportedBy: ensonic at sonicpulse.de
QAContact: gstreamer-bugs at lists.sourceforge.net
GNOME target: ---
GNOME version: ---
Bug #564749 mostly blocks on the GstTagReaderIface. An alternative would be to
have a set of hint-flags on GstElement. Those flags can be set on the pipeline,
individual bins and even elements. Bins could propagate the hints to new
children and hint-changes to existing children.
The purpose of the hints is to specify the intended use case a bit more to give
elements a chances for optimization. Right now gstreamer elements prepare to
support everything.
Some use cases
1) quickly play something from start to end
- no need for metadata
- no seeking/no playback rate changes
- no mucking with the pipeline at all until eos
2) quick metadata reading
- no prerolling
- no seektable building
3) no caps changes (video in fullscreen)
- quicker pad_alloc or even no need to check for caps changes in basetransform
No proposal for a set of hints yet :/
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