avformat/flvenc: Avoid unnecessary seek
When shifting the already written data in order to write the keyframe index, the flv muxer would first store the pre-shift size, then calculate how big the index will be eventually, then perform some seeks to update some size fields, then seek back to the end of the file to get the new position, followed by a seek to the position where writing will really start. Seeking back to the (already known) end position (that is actually used to perform this seek) to get the end position is of course unnecessary. It has been removed. Signed-off-by:Andreas Rheinhardt <andreas.rheinhardt@gmail.com> Signed-off-by:
Michael Niedermayer <michael@niedermayer.cc>
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