TAI Clock Information (`taic`) will be defined in ISO/IEC 23001-17 Amendment 1.
The TAI Clock Information box appears in the sample entry for the applicable track.
The clock information is metadata about the type and quality of a TAI clock. That
can be set via a stream tag. For example:
gst-launch-1.0 -v videotestsrc num-buffers=50 ! video/x-raw,width=1280,height=720,format=I420 ! taginject tags=precision-clock-type=can-sync-to-tai,precision-clock-time-uncertainty-nanoseconds=30000 ! isomp4mux ! filesink location=taic.mp4
This version writes compliant taic boxes if either or both of the tags are set. There
are two values in taic (for clock resolution and clock drift rate) that will be set to
reasonable default values.
taic is intended to be used (in video) with a TAITimestampPacket instance that is
per-sample auxilary information (i.e. via saio and saiz entries). That will be
provided as a follow-up change, based on a meta.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/2246>
This improves the test time from ~30 seconds to ~5 seconds, mainly
because of the AV1 encoding. However reduction in the uncompressed
tests is also worth while because there are a lot of them, and
will likely be more as the number of formats supported on both
encode side and in qtdemux for round-trip.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/2130>
This makes use of the recently added qtdemux changes to verify
that muxing works. At this stage its only used for unpadded RGB,
RGBA, BGRA, BGR and GRAY8 since that is all qtdemux supports
at this time. However the approach is general.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/2066>
This adds support for direct encoding of common formats into ISO base media file
format.
There are unit tests for formats that are not completely supported, to
check that those functions work correctly, and to ease future extension.
End-to-end testing currently requires use of gpac to validate files.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1990>
