[vlc-devel] [PATCH] Improve performance of zvbi subtitles

Finn Hughes finn.hughes1 at gmail.com
Tue Jun 11 19:20:29 CEST 2013

Reducing the size of the subpicture allows stutter free playback of 
teletext subtitles on significantly slower hardware. All testing on 
Fedora 18 using xvout.

I developed this patch against VLC 2.0 and have successfully tested 
against 1.1.4 and a 2.1 build from yesterday.


As well as feedback on this patch I'd welcome any insight as to why I 
get stuttering playback on an Atom D525 (dual core and hyperthreading) 
in various situations while my CPU usage is reported as ~50% on each of 
4 logical cores. This patch resolves one of the situations I was seeing 
too late frames but HD video or teletext subtitles + yadif2x are others. 
It is noticeable that with HD, playback is initially smooth but 
depending on the deinterlacing mode this lasts from 100s of ms (yadif) 
to >10s (off).
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