[Bug 739996] videomixer: Drops a lot of frames, if one of the sources is live

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=739996
  GStreamer | gst-plugins-good | git

--- Comment #6 from Andrei Sarakeev <sarakusha at gmail.com> 2014-11-12 12:55:07 UTC ---
Created an attachment (id=290508)
 --> (https://bugzilla.gnome.org/attachment.cgi?id=290508)
pipeline schemas

Short term correction:
for normal source:

   earliest_time = qos_timestamp + 2 * qos_diff + frame_duration;

For live source you need to make a correction. Shift by one frame (see schema,
element inter)

   earliest_time = qos_timestamp + 2 * qos_diff + 2*frame_duration;

qos_diff always > 0

I can a little bit wrong, but this formula is more accurate for live sources

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