[Bug 696501] New: Better multi-threaded decoding performance

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=696501
  GStreamer | gst-libav | git

           Summary: Better multi-threaded decoding performance
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gst-libav
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: t.i.m at zen.co.uk
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Currently we always use FF_THREAD_SLICE mode for multithreaded H.264 decoding.

This mode requires encoder support, so multiple threads will only be used if
the H.264 video is encoded in a suitable way (i.e. with multiple slices per
frame). This is not necessarily the case, and where this is not the case
decoding will be done in a single thread only, hampering performance.

We should use FF_THREAD_SLICE only for live pipelines where latency is
important, and use FF_THREAD_FRAME for decoding scenarios where latency does
not matter, to make sure we actually use multiple threads for decoding if
possible.

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