[gstreamer-bugs] [Bug 624212] mp4mux produces incorrect frame rates when h264 input uses bframes

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=624212
  GStreamer | gst-plugins-bad | git

Mark Nauwelaerts <mnauw> changed:

           What    |Removed                     |Added
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             Status|NEW                         |ASSIGNED
                 CC|                            |mnauw at users.sourceforge.net
         AssignedTo|gstreamer-bugs at lists.source |mnauw at users.sourceforge.net
                   |forge.net                   |

--- Comment #2 from Mark Nauwelaerts <mnauw at users.sourceforge.net> 2010-08-16 08:57:57 UTC ---
mp4mux does not guess any framerate, nor does it have to, since the qt/iso
format has no framerate to record as metadata.  It is up to the reader/demuxer
to either not care or come up with some estimate based on timestamps (which is
typically based on the first few ts, and can as such be off for e.g. a
recording with some jitter on first timestamps).

That said, indeed looks like qtmux ts handling with pts input ts is not ok.
However, note that some heuristic is involved as ts input may be dts or pts in
practice (even though in theory it should be pts).

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